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Recommendations for assessing earthworm populations in Brazilian ecosystems

Recomendações para avaliação de populações de minhocas em ecossistemas brasileiros

Abstract:

Earthworms are often related to fertile soils and are also frequently used as environmental quality indicators. However, to optimize their use as bioindicators, earthworm populations must be evaluated together with the environmental and anthropogenic variables regulating their communities. This review sought to identify the earthworm-sampling, soil chemical and physical, and environmental and anthropogenic attributes evaluated in 124 published studies that quantified earthworm abundance (>7,300 samples) in 765 sites with different types of climate, soils, land use, and management systems in Brazil. Soil chemical and physical attributes (except pH) were less reported (≤50% of studies) than other environmental variables such as sampling date, altitude, temperature, precipitation, climate and soil type, and land use (>50% of studies). Earthworms were rarely identified (24%) and few studies (31%) measured their biomass, although most provided adequate information on sampling protocol. Based on their importance in regulating earthworm populations, a set of variables is proposed to be evaluated when studying earthworm communities and other macrofauna groups. This should help guide future studies on earthworms in Brazil and other countries, optimize data collection and replicability, allow comparisons between different studies, and promote the use of earthworms as soil quality bioindicators.

Index terms:
bioindicators; macrofauna; Oligochaeta; soil quality

Resumo:

As minhocas são frequentemente relacionadas a solos férteis e, também, bastante usadas como indicadores da qualidade ambiental. No entanto, para otimizar seu uso como bioindicadores, as populações de minhocas devem ser avaliadas juntamente com as variáveis ambientais e antropogênicas que regulam as suas comunidades. Esta revisão buscou identificar os atributos relacionados à amostragem de minhocas, físicos e químicos dos solos, e ambientais e antropogênicos avaliados em 124 estudos publicados que quantificaram a abundância de minhocas (>7.300 amostras) em 765 locais com diferentes tipos de clima, solos, uso da terra e sistemas de manejo no Brasil. Os atributos químicos e físicos do solo (exceto pH) foram menos relatados (≤50% dos estudos) do que outras variáveis ambientais, como data de coleta, altitude, temperatura, precipitação, tipo de solo e de clima, e uso do solo (>50% dos estudos). As minhocas foram raramente identificadas (24%) e poucos estudos (31%) mediram sua biomassa, embora a maioria tenha fornecido informações adequadas sobre o protocolo de amostragem. Com base na sua importância para a regulação das populações de minhocas, propõe-se um conjunto de variáveis que devem ser avaliadas no estudo de comunidades de minhocas e outros grupos da macrofauna do solo. Isso deve ajudar a guiar futuros estudos sobre minhocas no Brasil e em outros países, otimizar a coleta e a replicabilidade de dados, permitir comparações entre diferentes estudos e promover o uso de minhocas como bioindicadores da qualidade do solo.

Termos para indexação:
bioindicadores; macrofauna; Oligochaeta; qualidade do solo

Introduction

Earthworms are among the most well-known soil animals, being ecosystem engineers (Jones et al., 1994JONES, C.G.; LAWTON, J.H.; SHACHAK, M. Organisms as ecosystem engineers. Oikos, v.69, p.373-386, 1994. DOI: https://doi.org/10.2307/3545850.
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; Lavelle et al., 1997LAVELLE, P.; BIGNELL, D.; LEPAGE, M.; WOLTERS, V.; ROGER, P.; INESON, P.; HEAL, O.W.; DHILLION, S. Soil function in a changing world: the role of invertebrate ecosystem engineers. European Journal of Soil Biology, v.33, p.159-193, 1997.) that actively contribute to many ecosystem services, including carbon sequestration and gaseous exchanges, plant production, and erosion control, as well as soil genesis, decomposition, and nutrient cycling (Stockdale & Watson, 2012STOCKDALE, E.A.; WATSON, C. Managing soil biota to deliver ecosystem services. [Newcastle]: Natural England, 2012. 141p. (Natural England Commissioned Reports NECR 100).; Jouquet et al., 2014JOUQUET, P.; BLANCHART, E.; CAPOWIEZ, Y. Utilization of earthworms and termites for the restoration of ecosystem functioning. Applied Soil Ecology, v.73, p.34-40, 2014. DOI: https://doi.org/10.1016/j.apsoil.2013.08.004.
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; Brown et al., 2015BROWN, G.G.; NIVA, C.C.; ZAGATTO, M.R.G.; FERREIRA, S. de A.; NADOLNY, H.S.; CARDOSO, G.B.X.; SANTOS, A.; MARTINEZ, G. de A.; PASINI, A.; BARTZ, M.L.C.; SAUTTER, K.D.; THOMAZINI, M.J.; BARETTA, D.; SILVA, E. da; ANTONIOLLI, Z.I.; DECAËNS, T.; LAVELLE, P.M.; SOUSA, J.P.; CARVALHO, F. Biodiversidade da fauna do solo e sua contribuição para os serviços ambientais. In: PARRON, L.M.; GARCIA, J.R.; OLIVEIRA, E.B. de; BROWN, G.G.; PRADO, R.B. (Ed.). Serviços ambientais em sistemas agrícolas e florestais do Bioma Mata Atlântica. Brasília: Embrapa, 2015. p.122-154.). Most farmers and gardeners are quick to recognize the value of earthworms for soil fertility (Brown et al., 2003BROWN, G.G.; BENITO, N.P.; PASINI, A.; SAUTTER, K.D.; GUIMARÃES, M. de F.; TORRES, E. No-tillage greatly increases earthworm populations in Paraná state, Brazil. Pedobiologia, v.47, p.764-771, 2003. DOI: https://doi.org/10.1078/0031-4056-00256.
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; Lima & Brussaard, 2010LIMA, A.C.R. de; BRUSSAARD, L. Earthworms as soil quality indicators: local and scientific knowledge in rice management systems. Acta Zoológica Mexicana, v.26, p.109-116, 2010. DOI: https://doi.org/10.21829/azm.2010.262881.
https://doi.org/10.21829/azm.2010.262881...
) and tend to associate the presence of a high number of earthworms with more fertile soils.

The community and abundance of earthworms at a given location are controlled by several biotic and abiotic factors, which act at different spatial scales (Figure 1) and include: climatic conditions, such as climate type, especially precipitation and temperature; soil properties, mainly its type and chemical and physical conditions, among which stand out pH, organic matter, moisture, and texture; vegetation, indicating the type of ecosystem, primarily plant cover; and history of the site, particularly human activities but also geological processes (Reynolds & Jordan, 1975REYNOLDS, J.W.; JORDAN, G.A. A preliminary conceptual model of megadrile activity and abundance in the Haliburton Highlands. Megadrilogica, v.2, p.1-11, 1975.; Brown & Domínguez, 2010BROWN, G.G.; DOMÍNGUEZ, J. Uso das minhocas como bioindicadoras ambientais: princípios e práticas - o 3° Encontro Latino Americano de Ecologia e Taxonomia de Oligochaetas. Acta Zoológica Mexicana, v.26, p.1-18, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262874.
https://doi.org/10.21829/azm.2010.262874...
). At the largest spatial scale, climate is the most important hierarchical factor (Lavelle et al., 1993LAVELLE, P.; BLANCHART, E.; MARTIN, A.; MARTIN, S.; SPAIN, A.; TOUTAIN, F.; BAROIS, I.; SCHAEFER, R. A hierarchical model for decomposition in terrestrial ecosystems: application to soils of the humid tropics. Biotropica, v.25, p.130-150, 1993. DOI: https://doi.org/10.2307/2389178.
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; Phillips et al., 2019PHILLIPS, H.R.P.; GUERRA, C.A.; BARTZ, M.L.C.; BRIONES, M.J.I.; BROWN, G.; CROWTHER, T.W.; FERLIAN, O.; GONGALSKY, K.B.; HOOGEN, J. van den; KREBS, J.; ORGIAZZI, A.; ROUTH, D.; SCHWARZ, B.; BACH, E.M.; BENNETT, J.; BROSE, U.; DECAËNS, T.; KÖNIG-RIES, B.; LOREAU, M.; MATHIEU, J.; MULDER, C.; VAN DER PUTTEN, W.H.; RAMIREZ, K.S.; RILLIG, M.C.; RUSSELL, D.; RUTGERS, M.; THAKUR, M.P.; DE VRIES, F.T.; WALL, D.H.; WARDLE, D.A.; ARAI, M.; AYUKE, F.O.; BAKER, G.H.; BEAUSÉJOUR, R.; BEDANO, J.C.; BIRKHOFER, K.; BLANCHART, E.; BLOSSEY, B.; BOLGER, T.; BRADLEY, R.L.; CALLAHAM, M.A.; CAPOWIEZ, Y.; CAULFIELD, M.E.; CHOI, A.; CROTTY, F.V.; DÁVALOS, A.; COSIN, D.J.D.; DOMINGUEZ, A.; DUHOUR, A.E.; EEKEREN, N. VAN; CHRISTOPH EMMERLING, C.; FALCO, L.B.; FERNÁNDEZ, R.; FONTE, S.J.; FRAGOSO, C.; GUTIÉRREZ LÓPEZ, M.G.; HACKENBERGER, D.K.; HERNÁNDEZ, L.M.; HISHI, T.; HOLDSWORTH, A.R.; HOLMSTRUP, M.; HOPFENSPERGER, K.N.; HUERTA LWANGA, E.; HUHTA, V.; HURISSO, T.T.; IANNONE III, B.V.; IORDACHE, M.; JOSCHKO, M.; KANEKO, N.; KANIANSKA, R.; AIDAN M. KEITH, A.M.; KELLY, C.A.; KERNECKER, M.L.; KLAMINDER, J.; KONÉ, A.W.; KOOCH, Y.; KUKKONEN, S.T.; LALTHANZARA, H.; LAMMEL, D.R.; LEBEDEV, I.M.; LI, Y.; JESUS LIDON, J.B.; LINCOLN, N.K.; LOSS, S.R.; MARICHAL, R.; MATULA, R.; MOOS, J.H.; MORENO, G.; MORÓN-RÍOS, A.MUYS, B.; NEIRYNCK, J.; NORGROVE, L.; NOVO, M.; NUUTINEN, V.; VICTORIA NUZZO, V.; RAHMAN P, M.; PANSU, J.; SHISHIR PAUDEL, S.; PÉRÈS, G.; PÉREZ-CAMACHO, L.; PIÑEIRO, R.; PONGE, J.-F.; RASHID, M.I.; REBOLLO, S.; JAVIER RODEIRO-IGLESIAS, J.; RODRÍGUEZ, M.Á.; ROTH, A.M.; ROUSSEAU, G.X.; ROZEN, A.; SAYAD, E.; VAN SCHAIK, L.; SCHARENBROCH, B.C.; SCHIRRMANN, M.; SCHMIDT, O.; SCHRÖDER, B.; SEEBER, J.; SHASHKOV, M.P.; SINGH, J.; SMITH, S.M.; STEINWANDTER, M.; TALAVERA, J.A.; TRIGO, D.; TSUKAMOTO, J.; VALENÇA, A.W. de; VANEK, S.J.; VIRTO, I.; WACKETT, A.A.; WARREN, M.W.; WEHR, N.H.; WHALEN, J.K.; WIRONEN, M.B.; WOLTERS, V.; ZENKOVA, I.V.; ZHANG, W.; CAMERON, E.K.; EISENHAUER, N. Global distribution of earthworm diversity. Science, v.366, p.480-485, 2019. DOI: https://doi.org/10.1126/science.aax4851.
https://doi.org/10.1126/science.aax4851...
), because it generally regulates the biome and type of ecosystem (vegetation), also influencing the formation of soil layers (Blume et al., 2016BLUME, H.-P.; BRÜMMER, G.W.; FLEIGE, H.; HORN, R.; KANDELER, E.; KÖGEL-KNABNER, I.; KRETZSCHMAR, R.; STAHR, K.; WILKE, B.-M. Soil Science. Heidelberg: Springer, 2016. 618p. DOI: https://doi.org/10.1007/978-3-642-30942-7.
https://doi.org/10.1007/978-3-642-30942-...
). At lower spatial scales, that is, at regional and local levels, other important determinants of earthworm communities are: human disturbance, such as soil management; type of crop or forest plantation; and inputs and cultural practices, including tillage and pesticide and fertilizer use (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.). All these directly or indirectly affect many of the soil characteristics that are important for earthworms, like organic matter content, pH, and nutrients, as well as plant productivity and cover that influence litter quality and quantity and soil temperature (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.). At the lowest spatial scale, i.e., within a soil profile of a particular site, it is mainly the soil physical and chemical characteristics that affect the soil as a habitat for earthworms and also the interactions (e.g., predation, parasitism, and mutualism) with other organisms (e.g. other soil biota) that can affect earthworm populations (Brown & Domínguez, 2010BROWN, G.G.; DOMÍNGUEZ, J. Uso das minhocas como bioindicadoras ambientais: princípios e práticas - o 3° Encontro Latino Americano de Ecologia e Taxonomia de Oligochaetas. Acta Zoológica Mexicana, v.26, p.1-18, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262874.
https://doi.org/10.21829/azm.2010.262874...
).

Figure 1.
Hierarchical model of the factors that determine earthworm communities in Brazilian ecosystems.

Because of their usefulness as environmental and, particularly, as soil quality indicators, earthworm communities have been regularly studied in European countries (Fründ et al., 2011FRÜND, H.-C.; GRAEFE, U.; TISCHER, S. Earthworms as bioindicators of soil quality. In: KARACA, A. (Ed.). Biology of earthworms. Berlin: Springer, 2011. p.261-278. (Soil Biology, 24). DOI: https://doi.org/10.1007/978-3-642-14636-7_16.
https://doi.org/10.1007/978-3-642-14636-...
; Pulleman et al., 2012PULLEMAN, M.; CREAMER, R.; HAMER, U.; HELDER, J.; PELOSI, C.; PÉRÈS, G.; RUTGERS, M. Soil biodiversity, biological indicators and soil ecosystem services - an overview of European approaches. Current Opinion in Environmental Sustainability, v.4, p.529-538, 2012. DOI: https://doi.org/10.1016/j.cosust.2012.10.009.
https://doi.org/10.1016/j.cosust.2012.10...
; Bünemann et al., 2018BÜNEMANN, E.K.; BONGIORNO, G.; BAI, Z.; CREAMER, R.E.; DEYN, G. de; GOEDE, R. de; FLESKENS, L.; GEISSEN, V.; KUYPER, T.W.; MÄDER, P.; PULLEMAN, M.; SUKKEL, W.; GROENIGEN, J.W. van; BRUSSAARD, L. Soil quality - a critical review. Soil Biology and Biochemistry, v.120, p.105-125, 2018. DOI: https://doi.org/10.1016/j.soilbio.2018.01.030.
https://doi.org/10.1016/j.soilbio.2018.0...
). Unfortunately, so far, there are few nation-wide monitoring programs in place, but both public and scientific interest in the state of the soil organism community, mainly of earthworms, are growing notably in France, the Netherlands, and Germany (Jeffery et al., 2010JEFFERY, S.; GARDI, C.; JONES, A.; MONTANARELLA, L.; MARMO, L.; MIKO, L.; RITZ, K.; PERES, G.; RÖMBKE, J.; VAN DER PUTTEN, W.H. European atlas of soil biodiversity. Luxembourg: EU, 2010. 128p.; Cluzeau et al., 2012CLUZEAU, D.; GUERNION, M.; CHAUSSOD, R.; MARTIN-LAURENT, F.; VILLENAVE, C.; CORTET, J.; RUIZ-CAMACHO, N.; PERNIN, C.; MATEILLE, T.; PHILIPPOT, L.; BELLIDO, A.; ROUGÉ, L.; ARROUAYS, D.; BISPO, A.; PÉRÈS, G. Integration of biodiversity in soil quality monitoring: baselines for microbial and soil fauna parameters for different land-use types. European Journal of Soil Biology, v.49, p.63-72, 2012. DOI: https://doi.org/10.1016/j.ejsobi.2011.11.003.
https://doi.org/10.1016/j.ejsobi.2011.11...
; Römbke et al., 2016RÖMBKE, J.; GARDI, C.; CREAMER, R.; MIKO, L. Soil biodiversity data: actual and potential use in European and national legislation. Applied Soil Ecology, v.97, p.125-133, 2016. DOI: https://doi.org/10.1016/j.apsoil.2015.07.003.
https://doi.org/10.1016/j.apsoil.2015.07...
). In Brazil, the use of earthworm communities as bioindicators has been explored in several publications (Nunes et al., 2007NUNES, D.H.; PASINI, A.; BENITO, N.P.; BROWN, G.G. Minhocas como bioindicadoras da qualidade ambiental. Um estudo de caso na região de Jaguapitã, PR, Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.467-480.; Uzêda et al., 2007UZÊDA, M.C.; GARCIA, M.A.; COSTA, J.R. Análise das relações entre populações de enchytraeidae e minhocas e seu uso como bioindicador da qualidade do solo. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja , 2007. p.489-495. ; Andréa, 2010ANDRÉA, M.M. de. O uso de minhocas como bioindicadores de contaminação de solos. Acta Zoológica Mexicana, v.26, p.95-107, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262880.
https://doi.org/10.21829/azm.2010.262880...
; Bartz et al., 2010BARTZ, M.L.C.; BROWN, G.G.; PASINI, A.; MELLO, I.; BORTOLUZZI, J.; TAMIOZZO, T.; PILECCO, O.P.; LUTZ, R.A. de T. Minhocas como bioindicadores de qualidade do sistema plantio direto na palha. In: ENCONTRO LATINO-AMERICANO DE ECOLOGIA E TAXONOMIA DE OLIGOQUETAS, 4., 2010, Curitiba. Minhocas como bioindicadoras ambientais: princípios e práticas: anais. Colombo: Embrapa Florestas, 2010. (Embrapa Florestas. Documentos, 199). Editores: George Gardner Brown, Cíntia Carla Niva, Klaus Dieter Sautter, Amarildo Pasini, Mac A. Callaham Jr. e Renato Marques. ELAETAO 4.; Fernandes et al., 2010FERNANDES, J.O.; UEHARA-PRADO, M.; BROWN, G.G. Minhocas exóticas como indicadoras de perturbação antrópica em áreas de Floresta Atlântica. Acta Zoológica Mexicana, v.26, p.211-217, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262889.
https://doi.org/10.21829/azm.2010.262889...
; Lima & Brussaard, 2010LIMA, A.C.R. de; BRUSSAARD, L. Earthworms as soil quality indicators: local and scientific knowledge in rice management systems. Acta Zoológica Mexicana, v.26, p.109-116, 2010. DOI: https://doi.org/10.21829/azm.2010.262881.
https://doi.org/10.21829/azm.2010.262881...
; Marichal et al., 2010MARICHAL, R.; MARTINEZ, A.F.; PRAXEDES, C.; RUIZ, D.; CARVAJAL, A.F.; OSZWALD, J.; HURTADO, M. del P.; BROWN, G.G.; GRIMALDI, M.; DESJARDINS, T.; SARRAZIN, M.; DECAËNS, T.; VELASQUEZ, E.; LAVELLE, P. Invasion of Pontoscolex corethrurus (Glossoscolecidae, Oligochaeta) in landscapes of the Amazonian deforestation arc. Applied Soil Ecology, v.46, p.443-449, 2010. DOI: https://doi.org/10.1016/j.apsoil.2010.09.001.
https://doi.org/10.1016/j.apsoil.2010.09...
; Rousseau et al., 2010ROUSSEAU, G.X.; SILVA, P.R. dos S.; CARVALHO, C.J.R. de. Earthworms, ants and other arthropods as soil health indicators in traditional and no-fire agro-ecosystems from Eastern Brazilian Amazonia. Acta Zoológica Mexicana, v.26, p.117-134, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262882.
https://doi.org/10.21829/azm.2010.262882...
); however, up to now, only one earthworm-based soil quality classification has been proposed, considering the density of these invertebrates in areas under no-tillage in the western region of the state of Paraná, Southern Brazil (Bartz et al., 2013BARTZ, M.L.C.; PASINI, A.; BROWN, G.G. Earthworms as soil quality indicators in Brazilian no-tillage systems. Applied Soil Ecology, v.69, p.39-48, 2013. DOI: https://doi.org/10.1016/j.apsoil.2013.01.011.
https://doi.org/10.1016/j.apsoil.2013.01...
). Based on earthworm abundance, these authors classified soil quality under no-tillage in four classes: poor, with < 25 individuals per square meter; moderate, with ≥ 25-100 individuals per square meter; good, with > 100-200 individuals per square meter; and excellent, with > 200 individuals per square meter. Earthworm abundance in farms was positively related to the sum of bases, but negatively associated with soil organic matter contents. Clearly, there is still much to be done both in Brazil and even worldwide concerning the use of earthworms for the indication of soil quality and monitoring purposes, especially considering the relative ease and low cost of sampling and the value given by land managers to earthworms.

Due to the large variety of factors that can influence earthworm communities in soils, the use of these organisms as bioindicators requires the sampling of several environmental data and soil attributes that are important for the soil to function and to work as a habitat for the development and activity of earthworm populations (Römbke et al., 2005RÖMBKE, J.; JÄNSCH, S.; DIDDEN, W. The use of earthworms in ecological soil classification and assessment concepts. Ecotoxicology and Environmental Safety, v.62, p.249-265, 2005. DOI: https://doi.org/10.1016/j.ecoenv.2005.03.027.
https://doi.org/10.1016/j.ecoenv.2005.03...
). Furthermore, in order to be able to compare the effects of different ecosystems, types of vegetation, and land use management systems on earthworm populations, the collection of data - on the environment, earthworm communities, and soil - must be standardized in each study and between studies, e.g., according to the International Organization for Standardization (ISO, 2018ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018.). Standardization proposals have been made before (Römbke et al., 2006RÖMBKE, J.; SOUSA, J.-P.; SCHOUTEN, T.; RIEPERT, F. Monitoring of soil organisms: a set of standardized field methods proposed by ISO. European Journal of Soil Biology, v.42, p.S61-S64, 2006. Supplement 1. DOI: https://doi.org/10.1016/j.ejsobi.2006.07.016.
https://doi.org/10.1016/j.ejsobi.2006.07...
; Römbke, 2007RÖMBKE, J. Searching for a standardization of quantitative terrestrial oligochaete sampling methods: the ISO methodology. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.497-505. ) and are available in ISO (2018)ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018., but their level of adoption is quite variable and often requires local adaptations (Silva et al., 2019SILVA, E. da; LIMA, O.G. de; ANDRADE, D.P. de; BROWN, G.G. Earthworm populations in forestry plantations (Araucaria angustifolia, Pinus elliottii) and Native Atlantic forest in Southern Brazil compared using two sampling methods. Pedobiologia, v.72, p.1-7, 2019. DOI: https://doi.org/10.1016/j.pedobi.2018.10.002.
https://doi.org/10.1016/j.pedobi.2018.10...
).

Therefore, the aim of this review was to assess the environmental and soil variables considered in the studies that quantitatively sampled earthworms in Brazil, and, based on this literature survey, to propose a set of variables that should be evaluated when studying earthworm populations. This should help guide future studies on earthworms in Brazil and other countries, optimize data collection, allow comparisons between different studies, and promote the use of earthworm communities as soil quality bioindicators in Brazilian ecosystems.

Characterization of studies on earthworm populations in Brazil

For this review, studies on earthworm populations in Brazilian ecosystems published from 1976 to 2017 were considered, being obtained from searchable online databases such as Web of Science, Scielo, Lattes-CNPq Platform, Biblioteca Digital de Teses e Dissertações, Google Scholar, and the Alice repository of Empresa Brasileira de Pesquisa Agropecuária (Embrapa). For an exhaustive review and to determine which soil, environmental, management, earthworm, and sampling-related factors were evaluated, non-indexed journals, book chapters, and conference proceedings on soil science, zoology, ecology, agroecology, and conservation agriculture were also included.

Over 150 studies on earthworm populations or soil macrofauna in general, including earthworms, were found. Different methods were used to sample earthworms and to make them rise to the soil surface (Peixoto & Marochi, 1996PEIXOTO, R.T.G.; MAROCHI, A.I. A influência da minhoca Pheretima sp. nas propriedades de um Latossolo Vermelho Escuro álico e no desenvolvimento de culturas em sistema de plantio direto, em Arapoti - PR. Revista Plantio Direto, v.35, p.23-25, 1996.; Römbke et al., 1999RÖMBKE, J.; MELLER, M.; GARCÍA, M. Earthworm densities in central Amazonian primary and secondary forests and a polyculture forestry plantation. Pedobiologia, v.43, p.518-522, 1999.; Ressetti, 2006RESSETTI, R.R. Abundance, biomass and species of earthworm in ecosystems of urban areas. Scientia Agraria, v.7, p.61-66, 2006.; Ressetti et al., 2008RESSETTI, R.R.; DIONÍSIO, J.A.; MOTTA, A.C.V. Comparação entre doses de Alil isotiocianato e a solução de formaldeído na extração de minhocas. Bragantia, v.67, p.25-33, 2008. DOI: https://doi.org/10.1590/S0006-87052008000100003.
https://doi.org/10.1590/S0006-8705200800...
; Steffen et al., 2013STEFFEN, G.P.K.; ANTONIOLLI, Z.I.; STEFFEN, R.B.; JACQUES, R.J.S. Importância ecológica e ambiental das minhocas. Revista de Ciências Agrárias, v.36, p.137-147, 2013.), including chemical solutions, such as diluted formaldehyde, mustard or onion extracts, or their main chemical components, e.g., Allyl isothiocyanate (AITC) (Zaborski, 2003ZABORSKI, E.R. Allyl isothiocyanate: an alternative chemical expellant for sampling earthworms. Applied Soil Ecology, v.22, p.87-95, 2003. DOI: https://doi.org/10.1016/S0929-1393(02)00106-3.
https://doi.org/10.1016/S0929-1393(02)00...
; Pelosi et al., 2009PELOSI, C.; BERTRAND, M.; CAPOWIEZ, Y.; BOIZARD, H.; ROGER-ESTRADE, J. Earthworm collection from agricultural fields: comparisons of selected expellants in presence/absence of hand-sorting. European Journal of Soil Biology, v.45, p.176-183, 2009. DOI: https://doi.org/10.1016/j.ejsobi.2008.09.013.
https://doi.org/10.1016/j.ejsobi.2008.09...
). Although, in some locations, some species of earthworms - particularly epigeics, epi-endogeics, or anecics - may be better sampled by chemical extraction or by combining both hand-sorting and chemical extraction (Römbke et al., 1999RÖMBKE, J.; MELLER, M.; GARCÍA, M. Earthworm densities in central Amazonian primary and secondary forests and a polyculture forestry plantation. Pedobiologia, v.43, p.518-522, 1999.; Römbke, 2007RÖMBKE, J. Searching for a standardization of quantitative terrestrial oligochaete sampling methods: the ISO methodology. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.497-505. ), only hand-sorting studies were selected, because this was the most common method used and would allow a more thorough comparison between studies. Studies were excluded when they did not present data on earthworm density per sample site, but rather as a means per land use system or type of soil management in several sites, making data recovery from individual sites impossible (Mathieu et al., 2009MATHIEU, J.; GRIMALDI, M.; JOUQUET, P.; ROULAND, C.; LAVELLE, P.; DESJARDINS, T.; ROSSI, J.-P. Spatial patterns of grasses influence soil macrofauna biodiversity in Amazonian pastures. Soil Biology and Biochemistry, v.41, p.586-593, 2009. DOI: https://doi.org/10.1016/j.soilbio.2008.12.020.
https://doi.org/10.1016/j.soilbio.2008.1...
; Marichal et al., 2010MARICHAL, R.; MARTINEZ, A.F.; PRAXEDES, C.; RUIZ, D.; CARVAJAL, A.F.; OSZWALD, J.; HURTADO, M. del P.; BROWN, G.G.; GRIMALDI, M.; DESJARDINS, T.; SARRAZIN, M.; DECAËNS, T.; VELASQUEZ, E.; LAVELLE, P. Invasion of Pontoscolex corethrurus (Glossoscolecidae, Oligochaeta) in landscapes of the Amazonian deforestation arc. Applied Soil Ecology, v.46, p.443-449, 2010. DOI: https://doi.org/10.1016/j.apsoil.2010.09.001.
https://doi.org/10.1016/j.apsoil.2010.09...
; Pimentel et al., 2011aPIMENTEL, M.S.; CARVALHO, R.S.; MARTINS, L.M.V.; SILVA, A.V.L. da. Seasonal response of edaphic bioindicators using green manure in Brazilian semi-arid conditions. Revista Ciência Agronômica, v.42, p.829-836, 2011a. DOI: https://doi.org/10.1590/S1806-66902011000400002.
https://doi.org/10.1590/S1806-6690201100...
; Baretta et al., 2013BARETTA, D.; TESTA, M.; ROCHA, E.; LUCIANER, E.; BARTZ, M.L.C.; BROWN, G.G.; SIMIONI, F.J.; PAIANO, D.; SPAGNOLLO, E.; WILDNER, L. do P.; VEIGA, M. da. As minhocas e suas relações com atributos físico-químicos no Oeste e Meio-Oeste do Estado de Santa Catarina. In: SEMINÁRIO DE ENSINO, PESQUISA E EXTENÇÃO - CEO/UDESC, 3., 2013, Chapecó. [Anais]. Chapecó: UDESC, 2013. 3o SEPE.; Vasconcellos et al., 2013VASCONCELLOS, R.L.F.; SEGAT, J.C.; BONFIM, J.A.; BARETTA, D.; CARDOSO, E.J.B.N. Soil macrofauna as an indicator of soil quality in an undisturbed riparian forest and recovering sites of different ages. European Journal of Soil Biology, v.58, p.105-112, 2013. DOI: https://doi.org/10.1016/j.ejsobi.2013.07.001.
https://doi.org/10.1016/j.ejsobi.2013.07...
; Rousseau et al., 2014ROUSSEAU, G.X.; SILVA, P.R. dos S.; CELENTANO, D.; CARVALHO, C.J.R. de. Macrofauna do solo em uma cronosequência de capoeiras, florestas e pastos no Centro de Endemismo Belém, Amazônia Oriental. Acta Amazonica, v.44, p.499-512, 2014. DOI: https://doi.org/10.1590/1809-4392201303245.
https://doi.org/10.1590/1809-43922013032...
; Santos et al., 2016SANTOS, E. dos; VARGAS, G.R. de; MELLO FILHO, N.R. de; GARDNER, G.B. Comparação entre diferentes métodos de coleta de minhocas em dois diferentes sistemas florestais. Scientia Vitae, v.3, p.34-40, 2016. ).

This resulted in the evaluation of a total of 124 published studies that are listed in Table 1, which includes the source and location (municipality and state in Brazil) of the study, biome, land use systems sampled, number of sites, and type of measurements performed (earthworm density and/or biomass and associated soil data). Overall, only about 40% of all studies were journal articles and a large proportion (~60%) were material produced outside the traditional commercial or academic publishing and distribution channels, including 36 theses and dissertations and 44 conference proceedings papers.

Table 1.
Location of the experiment, land use systems evaluated, number of sampled sites, and type of data identified in the 124 published studies on earthworm populations in Brazilian ecosystems, used to build the database available at Nadolny et al. (2020)NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
.

The data on soil, environmental, and earthworm sampling variables, as well as on the management practices adopted at each sampling site, obtained from the 124 publications are available for download at Dryad, an online open-access repository (Nadolny et al., 2020NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
). This dataset provides information on the number of publications containing each environmental, earthworm, and soil physical and chemical variable, besides the corresponding number of points/sampling sites and their proportion. The data covers over 7.300 earthworm samples, from a wide range of soils, vegetation types, and management systems in Brazil. In the following sections, these studies and their data were reviewed according to the geographical spread of the samples, climate and vegetation-related variables, management practices adopted at the sites, and various soil and earthworm sampling-related variables.

Geographic representation of the studies

The 124 evaluated publications showed earthworm abundance for 765 sites throughout Brazil (Figure 2), the majority located in the Atlantic Forest biome (64% of the total), with a much smaller proportion in the Amazon (17%), Cerrado (12%), Pampa (3%), Caatinga (3%), and Pantanal (1%). As most Brazilian researchers work in the Atlantic Forest, considered a biodiversity hot spot (Myers et al., 2000MYERS, N.; MITTERMEIER, R.A.; MITTERMEIER, C.G.; FONSECA, G.A.B. da; KENT, J. Biodiversity hotspots for conservation priorities. Nature, v.403, p.853-858, 2000. DOI: https://doi.org/10.1038/35002501.
https://doi.org/10.1038/35002501...
) with 144 known earthworm species (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.), it is not surprising that most samples were collected from this biome (Table 1), specifically from sites ranging from the state of Rio Grande do Sul (seven studies in seven municipalities), in Southern Brazil, to the state of Paraíba in the Northeast (only one study in two municipalities) (Guerra & Silva, 1994GUERRA, R.T.; SILVA, E.G. da. Estudo das comunidades de minhocas (Annelida, Oligochaeta) em alguns ambientes terrestres do Estado da Paraíba. Revista Nordestina de Biologia, v.9, p.209-223, 1994.). Paraná was the best assessed state, comprising 38% of all studies, which were performed in 47 municipalities. Of the three states exclusively in the Atlantic Forest biome, i.e., Espírito Santo, Rio de Janeiro, and Santa Catarina, the former requires much more attention because there is scant information on earthworms from this state (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.), with only one known study in one municipality until now (Figure 2). The states from Northeastern Brazil were generally little represented in the publications. In fact, several states in this region - Pernambuco, Rio Grande do Norte, Sergipe, and Alagoas - have no quantitative data on earthworm populations. Another state with notoriously few records on earthworms (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.) and with no quantitative sampling is Tocantins. Clearly, sampling efforts in these states are urgently needed in order to reduce the knowledge gap on earthworm ecology and distribution in the country.

Figure 2.
Geographic distribution and number of earthworm sampling sites in each Brazilian biome. Brazilian states: RO, Rôndonia; AC, Acre; AM, Amazonas; RR, Roraima; PA, Pará; AP, Amapá; MA, Maranhão; PI, Piauí; CE, Ceará; RN, Rio Grande do Norte; PB, Paraíba; PE, Pernambuco; AL, Alagoas; SE, Sergipe; BA, Bahia; ES, Espírito Santo; RJ, Rio de Janeiro; SP, São Paulo; PR, Paraná; SC, Santa Catarina; RS, Rio Grande do Sul; MS, Mato Grosso do Sul; MT, Mato Grosso; TO, Tocantins; GO, Goiânia; DF, Distrito Federal; and MG, Minas Gerais.

Only four studies examined the Caatinga and two the Pantanal (Table 1), revealing the lack of earthworm research in these biomes that occupy approximately 10 and 1.8% of Brazil’s surface area, respectively (IBGE, 2019IBGE. Instituto Brasileiro de Geografia e Estatística. Biomas e Sistema Costeiro-Marinho do Brasil: compatível com a escala 1:250 000. Rio de Janeiro, 2019. 161p. (Relatórios metodológicos, v.45).). Although only three species of earthworms from the Caatinga are known (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.), there are records of large and very active earthworms in this biome (Cordero, 1943CORDERO, E.H. Oligoquetos Sudamericanos de la familia Glossoscolecidae II: dos nuevas especies de Rhinodrilus del Nordeste del Brasil. Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo, v.1, p.1-6, 1943.; Almeida et al., 2009ALMEIDA, M.V.R. de; OLIVEIRA, T.S. de; BEZERRA, A.M.E. Biodiversidade em sistemas agroecológicos no município de Choró, CE, Brasil. Ciência Rural, v.39, p.1080-1087, 2009. DOI: https://doi.org/10.1590/S0103-84782009005000047.
https://doi.org/10.1590/S0103-8478200900...
), and clayey soils and/or those with a higher potential to maintain moisture can harbor earthworm population densities of over 100 individuals per square meter (Araújo et al., 2010ARAÚJO, V.F.P.; BANDEIRA, A.G.; VASCONCELLOS, A. Abundance and stratification of soil macroarthropods in a Caatinga forest in Northeast Brazil. Brazilian Journal of Biology, v.70, p.737-746, 2010. Suppl. DOI: https://doi.org/10.1590/S1519-69842010000400006.
https://doi.org/10.1590/S1519-6984201000...
; Lima et al., 2010LIMA, S.S. de; AQUINO, A.M. de; LEITE, L.F.C.; VELÁSQUEZ, E.; LAVELLE, P. Relação entre macrofauna edáfica e atributos químicos do solo em diferentes agroecossistemas. Pesquisa Agropecuária Brasileira, v.45, p.322-331, 2010. DOI: https://doi.org/10.1590/S0100-204X2010000300013.
https://doi.org/10.1590/S0100-204X201000...
). In the Caatinga, earthworms are subjected to a higher seasonal variation and to a lower precipitation than in other locations in the country, which causes them to undergo diapause or prolonged inactivity, generally at greater soil depths (Silva et al., 2015bSILVA, R.H.P. da; RODRIGUES, I.P.S.; GUIMARÃES, A.Q.; DRUMOND, M.A. Comportamento de construção de câmara de estivação por Rhinodrilus alatus e sua relação com a pluviosidade. In: ENCONTRO LATINO-AMERICANO DE ECOLOGIA E TAXONOMIA DE OLIGOQUETAS, 5.; SIMPÓSIO ENGENHEIROS EDÁFICOS, FERTILIDADE DO SOLO E TERRA PRETA DE ÍNDIO (TPI), 2015, Curitiba. Anais. [S.l.]: Federação Brasileira de Plantio Direto de Irrigação, 2015b. 5º ELAETAO.). Therefore, future sampling in this biome should seek to better understand the climatic and edaphic limitations to earthworm populations, also taking into account the time of year for sampling, prioritizing the rainy season, when the soil is moister and the earthworms are active and closer to the surface. In two sites in the Caatinga, earthworms were found only in samples collected in the rainy season (Araújo et al., 2010ARAÚJO, V.F.P.; BANDEIRA, A.G.; VASCONCELLOS, A. Abundance and stratification of soil macroarthropods in a Caatinga forest in Northeast Brazil. Brazilian Journal of Biology, v.70, p.737-746, 2010. Suppl. DOI: https://doi.org/10.1590/S1519-69842010000400006.
https://doi.org/10.1590/S1519-6984201000...
; Lima et al., 2010LIMA, S.S. de; AQUINO, A.M. de; LEITE, L.F.C.; VELÁSQUEZ, E.; LAVELLE, P. Relação entre macrofauna edáfica e atributos químicos do solo em diferentes agroecossistemas. Pesquisa Agropecuária Brasileira, v.45, p.322-331, 2010. DOI: https://doi.org/10.1590/S0100-204X2010000300013.
https://doi.org/10.1590/S0100-204X201000...
).

In the Pantanal, where climate seasonality is also important, the yearly flooding of vast areas may cause difficulties, both for the sampling of earthworms and of their activity in the soil. Currently only 18 earthworm species from this biome are known, and some of them are well adapted to living in flooded soils (Carter & Beadle, 1931CARTER, G.S.; BEADLE, L.C. The fauna of the swamps of the Paraguayan Chaco in relation to its environment. III. Respiratory adaptation in the Oligochaeta. Linnean Society’s Journal (Zoology), v.37, p.379-386, 1931. DOI: https://doi.org/10.1111/j.1096-3642.1931.tb00468.x.
https://doi.org/10.1111/j.1096-3642.1931...
; Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). The data of the two studies carried out in this biome (Table 1 and Figure 2) showed that the earthworm populations there had a high density in native vegetation (Dias et al., 2006 aDIAS, A.M.; SILVA, R.F. da; MERCANTE, F.M. Caracterização da macrofauna invertebrada do solo sob diferentes fitofisionomias do Pantanal Sul-Mato-Grossense. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 27.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 11.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 9.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 6., 2006, Bonito, MS. A busca das raízes: anais. Dourados: Embrapa Agropecuária Oeste, 2006a. (Embrapa Agropecuária Oeste. Documentos, 82). FERTBIO 2006.), but a very low abundance under cassava (Manihot esculenta Crantz) crops (Brito et al., 2016BRITO, M.F. de; TSUJIGUSHI, B.P.; OTSUBO, A.A.; SILVA, R.F. da; MERCANTE, F.M. Diversidade da fauna edáfica e epigeica de invertebrados em consórcio de mandioca com adubos verdes. Pesquisa Agropecuária Brasileira, v.51, p.253-260, 2016. DOI: https://doi.org/10.1590/S0100-204X2016000300007.
https://doi.org/10.1590/S0100-204X201600...
). Unfortunately, the earthworm species were not identified, but it is known that flooded areas, including rice (Oryza sativa L.) plantations (Barrigossi et al., 2009BARRIGOSSI, J.A.F.; BROWN, G.G.; PEDRETTI JÚNIOR, C. Minhocas em arroz irrigado: pragas ou benéficas? In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 6., 2009, Porto Alegre. Estresses e sustentabilidade: desafios para a lavoura arrozeira: [anais]. Porto Alegre: Sosbai, 2009.; Bartz et al., 2009bBARTZ, M.L.C.; BROWN, G.G.; PASINP, A.; LIMA, A.C.R. de; GASSEN, D.N. As minhocas e o manejo do solo: o caso do plantio direto do arroz irrigado. Revista Plantio Direto, v.19, p.4-8, 2009b.), can harbor a significant numbers of native species, especially of the Ocnerodrilidae and Almidae families (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). Therefore, future sampling in this biome should consider the particularities of each region and its earthworm species, adapting the methodology to the local conditions.

In the Pampa biome, which occupies 2% of Brazil’s territory, only five studies evaluated earthworm populations (Table 1) in the regions of Santa Maria and Pelotas, in the state of Rio Grande do Sul (Figure 2). From this biome, 36 earthworm species are known, but 70% of them are exotic, i.e., non-native species, originally from other countries (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). The predominant Cfa climate in this biome has no defined dry season (Alvares et al., 2013ALVARES, C.A.; STAPE, J.L.; SENTELHAS, P.C.; GONÇALVES, J.L. de M.; SPAROVEK, G. Köppen’s climate classification map for Brazil. Meteorologische Zeitschrift, v.22, p.711-728, 2013. DOI: https://doi.org/10.1127/0941-2948/2013/0507.
https://doi.org/10.1127/0941-2948/2013/0...
), which allows earthworms to be active all year, even during winter, at very low ambient temperatures of -4°C (Santos et al., 2019SANTOS, A.; MAIA, L. dos S.; FERREIRA, T.; DEMETRIO, W.C.; NADOLNY, H.S.; RIBEIRO, L.V.; SCHIEDECK, G.; COSTA, F.A. da; BARTZ, M.L.C.; BROWN, G.G. (Ed.). Minhocas como bioindicadoras da qualidade do solo em ecossistemas na Embrapa Clima Temperado. Pelotas: Embrapa Clima Temperado, 2019. 37p. (Embrapa Clima Temperado. Documentos 418).), since the soil does not freeze.

In the Cerrado biome, another biodiversity hotspot (Myers et al., 2000MYERS, N.; MITTERMEIER, R.A.; MITTERMEIER, C.G.; FONSECA, G.A.B. da; KENT, J. Biodiversity hotspots for conservation priorities. Nature, v.403, p.853-858, 2000. DOI: https://doi.org/10.1038/35002501.
https://doi.org/10.1038/35002501...
) that covers 24% of Brazil (IBGE, 2019IBGE. Instituto Brasileiro de Geografia e Estatística. Biomas e Sistema Costeiro-Marinho do Brasil: compatível com a escala 1:250 000. Rio de Janeiro, 2019. 161p. (Relatórios metodológicos, v.45).), 20 studies assessed earthworm populations. Although termites and ants predominate in this biome (Benito et al., 2004BENITO, N.P.; BROSSARD, M.; PASINI, A.; GUIMARÃES, M. de F.; BOBILLIER, B. Transformations of soil macroinvertebrate populations after native vegetation conversion to pasture cultivation (Brazilian Cerrado). European Journal of Soil Biology, v.40, p.147-154, 2004. DOI: https://doi.org/10.1016/j.ejsobi.2005.02.002.
https://doi.org/10.1016/j.ejsobi.2005.02...
; Marchão et al., 2009MARCHÃO, R.L.; LAVELLE, P.; CELINI, L.; BALBINO, L.C.; VILELA, L.; BECQUER, T. Soil macrofauna under integrated crop-livestock systems in a Brazilian Cerrado Ferralsol. Pesquisa Agropecuária Brasileira, v.44, p.1011-1020, 2009. DOI: https://doi.org/10.1590/S0100-204X2009000800033.
https://doi.org/10.1590/S0100-204X200900...
), earthworm populations can have a considerable abundance and biomass in certain locations, mainly in pastures or integrated production systems (Brigante, 2000BRIGANTE, J. Comparação de algumas comunidades de macrofauna e microrganismos de solo, encontradas em áreas de mata e pastagens, em um Latossolo. 2000. 105p. Tese (Doutorado) - Universidade Federal de São Carlos, São Carlos.; Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.; Marchão et al., 2009MARCHÃO, R.L.; LAVELLE, P.; CELINI, L.; BALBINO, L.C.; VILELA, L.; BECQUER, T. Soil macrofauna under integrated crop-livestock systems in a Brazilian Cerrado Ferralsol. Pesquisa Agropecuária Brasileira, v.44, p.1011-1020, 2009. DOI: https://doi.org/10.1590/S0100-204X2009000800033.
https://doi.org/10.1590/S0100-204X200900...
), but also in coffee (Coffea arabica L.) plantations (Ricci et al., 1999RICCI, M. dos S.F.; AQUINO, A.M. de; SILVA, E.M.R. da; PEREIRA, J.C.; REIS, V.M. Transformações biológicas e microbiológicas ocorridas no solo de um cafezal convencional em conversão para orgânico. Seropédica: Embrapa Agrobiologia, 1999. 10p. (Embrapa Agrobiologia. Comunicado técnico, 31).) and under no-tillage agriculture (Blanchart et al., 2007BLANCHART, E.; BERNOUX, M.; SARDA, X.; SIQUEIRA NETO, M.; CERRI, C.C.; PICCOLO, M.; DOUZET, J.-M.; SCOPEL, E.; FELLER, C. Effect of direct seeding mulch-based systems on soil carbon storage and macrofauna in central Brazil. Agriculturae Conspectus Scientificus, v.72, p.81-87, 2007.). However, native Cerrado vegetation tends to have very few earthworms, especially in Central Brazil (Benito et al., 2008BENITO, N.P.; GUIMARÃES, M. de F.; PASINI, A. Caracterização de sistemas de manejo em latossolo vermelho utilizando parâmetros biológicos, físicos e químicos. Semina: Ciências Agrárias, v.29, p.473-484, 2008. DOI: https://doi.org/10.5433/1679-0359.2008v29n3p473.
https://doi.org/10.5433/1679-0359.2008v2...
; Dias et al., 1997DIAS, V.S.; BROSSARD, M.; ASSAD, M.L.L. Macrofauna edáfica invertebrada em áreas de vegetação nativa da região de Cerrados. In: LEITE, L.L.; SAITO, C.H. (Ed.). Contribuição ao conhecimento ecológico do cerrado. Brasília: UnB, 1997. p.168-173. Trabalho apresentado no 3º Congresso de Ecologia do Brasil, Brasília, 1996.). Sampling time in this biome is especially important, because soils tend to be very dry and hard in winter, making it difficult to collect earthworms, which undergo diapause or aestivation (Abe & Buck, 1985ABE, A.S.; BUCK, N. Oxygen uptake of active and aestivating earthworm Glossoscolex paulistus (Oligochaeta, Glossoscolecidae). Comparative Biochemistry and Physiology, v.81, p.63-66, 1985. DOI: https://doi.org/10.1016/0300-9629(85)90267-1.
https://doi.org/10.1016/0300-9629(85)902...
; Silva et al., 2015bSILVA, R.H.P. da; RODRIGUES, I.P.S.; GUIMARÃES, A.Q.; DRUMOND, M.A. Comportamento de construção de câmara de estivação por Rhinodrilus alatus e sua relação com a pluviosidade. In: ENCONTRO LATINO-AMERICANO DE ECOLOGIA E TAXONOMIA DE OLIGOQUETAS, 5.; SIMPÓSIO ENGENHEIROS EDÁFICOS, FERTILIDADE DO SOLO E TERRA PRETA DE ÍNDIO (TPI), 2015, Curitiba. Anais. [S.l.]: Federação Brasileira de Plantio Direto de Irrigação, 2015b. 5º ELAETAO.), normally in deeper layers.

In the Amazon, earthworm populations were reported in 24 publications (19% of the total). However, greater efforts are needed to better understand earthworm populations in this biome and the possible impacts of human activities, considering the region’s size, the large variation in vegetation, soils, and natural and human-altered environments in this biome, and the high diversity of earthworm species in the Amazon Basin (Lavelle & Lapied, 2003LAVELLE, P.; LAPIED, E. Endangered earthworms of Amazonia: an homage to Gilberto Righi. Pedobiologia, v.47, p.419-427, 2003. DOI: https://doi.org/10.1078/0031-4056-00207.
https://doi.org/10.1078/0031-4056-00207...
). In addition, the presence of earthworms is high in this biome: no earthworms (0 individual per square meter) were reported only in five cases (3.5%), in dense Ombrophylous forest (Silva et al., 2005SILVA, R.B. da; PEQUENO, P.L. de L.; ALMEIDA, C.M.V.C. de; BATISTA, C.C.; BURAK, S.C.; SOUZA, M. da S.; SOUZA, M.B.L.; BEZERRA, I.L. Avaliação inicial da fauna edáfica em três classes de solos utilizados com café arborizado em Rondônia. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 30., 2005, Recife. Solos, sustentabilidade e qualidade ambiental: anais. Recife: SBCS: Embrapa Solos - UEP Recife: UFRPE, 2005.; Catanozi, 2010CATANOZI, G. Análise espacial da macrofauna edáfica sob diferentes condições ambientais dos trópicos úmidos. 2010. 202p. Tese (Doutorado) - Universidade Estadual de Campinas, Campinas.; Viana, 2012VIANA, R. de M. Indicadores de qualidade de solo para avaliação da restauração florestal: estudo de caso UHE Balbina - AM. 2012. 65p. Dissertação (Mestrado) - Instituto Nacional de Pesquisas da Amazônia, Manaus.), and in corn (Zea mays L.) (Moura et al., 2015MOURA, E.G.; AGUIAR, A. das C.F.; PIEDADE, A.R.; ROUSSEAU, G.X. Contribution of legume tree residues and macrofauna to the improvement of abiotic soil properties in the eastern Amazon. Applied Soil Ecology, v.86, p.91-99, 2015. DOI: https://doi.org/10.1016/j.apsoil.2014.10.008.
https://doi.org/10.1016/j.apsoil.2014.10...
) and coffee (Silva et al., 2005SILVA, R.B. da; PEQUENO, P.L. de L.; ALMEIDA, C.M.V.C. de; BATISTA, C.C.; BURAK, S.C.; SOUZA, M. da S.; SOUZA, M.B.L.; BEZERRA, I.L. Avaliação inicial da fauna edáfica em três classes de solos utilizados com café arborizado em Rondônia. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 30., 2005, Recife. Solos, sustentabilidade e qualidade ambiental: anais. Recife: SBCS: Embrapa Solos - UEP Recife: UFRPE, 2005.) plantations.

Clearly, sampling efforts in the different Brazilian biomes have been highly variable (Figure 2). Furthemore, the specificities of each biome in terms of soils, vegetation, climate, and earthworm species present must be taken into account in order to optimize sampling schemes. Moreover, the data presented here can be used to target or prioritize future sampling sites and regions, in order to improve the understanding of earthworm communities in different ecosystems and their role in soil processes.

Climate and vegetation-related variables

Only three variables were considered by all authors: municipality, state, and soil cover/main vegetation type; other attributes that are easily available or that can be easily determined were often not included. The absence of these data, particularly sampling date (provided in 93% of the studies), sampling season (in 37%), geographical coordinates (in 65%), or the name of the specific location (in 74%), complicates data interpretation and comparison. Since climatic and vegetation-related variables are key determinants of earthworm biodiversity and activity in soils, their adequate reporting is crucial to correctly identify the context in which the data on earthworm communities was collected and to interpret the obtained results (Lavelle et al., 1993LAVELLE, P.; BLANCHART, E.; MARTIN, A.; MARTIN, S.; SPAIN, A.; TOUTAIN, F.; BAROIS, I.; SCHAEFER, R. A hierarchical model for decomposition in terrestrial ecosystems: application to soils of the humid tropics. Biotropica, v.25, p.130-150, 1993. DOI: https://doi.org/10.2307/2389178.
https://doi.org/10.2307/2389178...
; Brown & Domínguez, 2010BROWN, G.G.; DOMÍNGUEZ, J. Uso das minhocas como bioindicadoras ambientais: princípios e práticas - o 3° Encontro Latino Americano de Ecologia e Taxonomia de Oligochaetas. Acta Zoológica Mexicana, v.26, p.1-18, 2010. Número especial 2. DOI: https://doi.org/10.21829/azm.2010.262874.
https://doi.org/10.21829/azm.2010.262874...
; Phillips et al., 2019PHILLIPS, H.R.P.; GUERRA, C.A.; BARTZ, M.L.C.; BRIONES, M.J.I.; BROWN, G.; CROWTHER, T.W.; FERLIAN, O.; GONGALSKY, K.B.; HOOGEN, J. van den; KREBS, J.; ORGIAZZI, A.; ROUTH, D.; SCHWARZ, B.; BACH, E.M.; BENNETT, J.; BROSE, U.; DECAËNS, T.; KÖNIG-RIES, B.; LOREAU, M.; MATHIEU, J.; MULDER, C.; VAN DER PUTTEN, W.H.; RAMIREZ, K.S.; RILLIG, M.C.; RUSSELL, D.; RUTGERS, M.; THAKUR, M.P.; DE VRIES, F.T.; WALL, D.H.; WARDLE, D.A.; ARAI, M.; AYUKE, F.O.; BAKER, G.H.; BEAUSÉJOUR, R.; BEDANO, J.C.; BIRKHOFER, K.; BLANCHART, E.; BLOSSEY, B.; BOLGER, T.; BRADLEY, R.L.; CALLAHAM, M.A.; CAPOWIEZ, Y.; CAULFIELD, M.E.; CHOI, A.; CROTTY, F.V.; DÁVALOS, A.; COSIN, D.J.D.; DOMINGUEZ, A.; DUHOUR, A.E.; EEKEREN, N. VAN; CHRISTOPH EMMERLING, C.; FALCO, L.B.; FERNÁNDEZ, R.; FONTE, S.J.; FRAGOSO, C.; GUTIÉRREZ LÓPEZ, M.G.; HACKENBERGER, D.K.; HERNÁNDEZ, L.M.; HISHI, T.; HOLDSWORTH, A.R.; HOLMSTRUP, M.; HOPFENSPERGER, K.N.; HUERTA LWANGA, E.; HUHTA, V.; HURISSO, T.T.; IANNONE III, B.V.; IORDACHE, M.; JOSCHKO, M.; KANEKO, N.; KANIANSKA, R.; AIDAN M. KEITH, A.M.; KELLY, C.A.; KERNECKER, M.L.; KLAMINDER, J.; KONÉ, A.W.; KOOCH, Y.; KUKKONEN, S.T.; LALTHANZARA, H.; LAMMEL, D.R.; LEBEDEV, I.M.; LI, Y.; JESUS LIDON, J.B.; LINCOLN, N.K.; LOSS, S.R.; MARICHAL, R.; MATULA, R.; MOOS, J.H.; MORENO, G.; MORÓN-RÍOS, A.MUYS, B.; NEIRYNCK, J.; NORGROVE, L.; NOVO, M.; NUUTINEN, V.; VICTORIA NUZZO, V.; RAHMAN P, M.; PANSU, J.; SHISHIR PAUDEL, S.; PÉRÈS, G.; PÉREZ-CAMACHO, L.; PIÑEIRO, R.; PONGE, J.-F.; RASHID, M.I.; REBOLLO, S.; JAVIER RODEIRO-IGLESIAS, J.; RODRÍGUEZ, M.Á.; ROTH, A.M.; ROUSSEAU, G.X.; ROZEN, A.; SAYAD, E.; VAN SCHAIK, L.; SCHARENBROCH, B.C.; SCHIRRMANN, M.; SCHMIDT, O.; SCHRÖDER, B.; SEEBER, J.; SHASHKOV, M.P.; SINGH, J.; SMITH, S.M.; STEINWANDTER, M.; TALAVERA, J.A.; TRIGO, D.; TSUKAMOTO, J.; VALENÇA, A.W. de; VANEK, S.J.; VIRTO, I.; WACKETT, A.A.; WARREN, M.W.; WEHR, N.H.; WHALEN, J.K.; WIRONEN, M.B.; WOLTERS, V.; ZENKOVA, I.V.; ZHANG, W.; CAMERON, E.K.; EISENHAUER, N. Global distribution of earthworm diversity. Science, v.366, p.480-485, 2019. DOI: https://doi.org/10.1126/science.aax4851.
https://doi.org/10.1126/science.aax4851...
).

A total of 13 climate and vegetation-related variables were identified and selected from the evaluated studies (Table 2). Climate is among the environmental attributes considered most important for earthworms (Phillips et al., 2019PHILLIPS, H.R.P.; GUERRA, C.A.; BARTZ, M.L.C.; BRIONES, M.J.I.; BROWN, G.; CROWTHER, T.W.; FERLIAN, O.; GONGALSKY, K.B.; HOOGEN, J. van den; KREBS, J.; ORGIAZZI, A.; ROUTH, D.; SCHWARZ, B.; BACH, E.M.; BENNETT, J.; BROSE, U.; DECAËNS, T.; KÖNIG-RIES, B.; LOREAU, M.; MATHIEU, J.; MULDER, C.; VAN DER PUTTEN, W.H.; RAMIREZ, K.S.; RILLIG, M.C.; RUSSELL, D.; RUTGERS, M.; THAKUR, M.P.; DE VRIES, F.T.; WALL, D.H.; WARDLE, D.A.; ARAI, M.; AYUKE, F.O.; BAKER, G.H.; BEAUSÉJOUR, R.; BEDANO, J.C.; BIRKHOFER, K.; BLANCHART, E.; BLOSSEY, B.; BOLGER, T.; BRADLEY, R.L.; CALLAHAM, M.A.; CAPOWIEZ, Y.; CAULFIELD, M.E.; CHOI, A.; CROTTY, F.V.; DÁVALOS, A.; COSIN, D.J.D.; DOMINGUEZ, A.; DUHOUR, A.E.; EEKEREN, N. VAN; CHRISTOPH EMMERLING, C.; FALCO, L.B.; FERNÁNDEZ, R.; FONTE, S.J.; FRAGOSO, C.; GUTIÉRREZ LÓPEZ, M.G.; HACKENBERGER, D.K.; HERNÁNDEZ, L.M.; HISHI, T.; HOLDSWORTH, A.R.; HOLMSTRUP, M.; HOPFENSPERGER, K.N.; HUERTA LWANGA, E.; HUHTA, V.; HURISSO, T.T.; IANNONE III, B.V.; IORDACHE, M.; JOSCHKO, M.; KANEKO, N.; KANIANSKA, R.; AIDAN M. KEITH, A.M.; KELLY, C.A.; KERNECKER, M.L.; KLAMINDER, J.; KONÉ, A.W.; KOOCH, Y.; KUKKONEN, S.T.; LALTHANZARA, H.; LAMMEL, D.R.; LEBEDEV, I.M.; LI, Y.; JESUS LIDON, J.B.; LINCOLN, N.K.; LOSS, S.R.; MARICHAL, R.; MATULA, R.; MOOS, J.H.; MORENO, G.; MORÓN-RÍOS, A.MUYS, B.; NEIRYNCK, J.; NORGROVE, L.; NOVO, M.; NUUTINEN, V.; VICTORIA NUZZO, V.; RAHMAN P, M.; PANSU, J.; SHISHIR PAUDEL, S.; PÉRÈS, G.; PÉREZ-CAMACHO, L.; PIÑEIRO, R.; PONGE, J.-F.; RASHID, M.I.; REBOLLO, S.; JAVIER RODEIRO-IGLESIAS, J.; RODRÍGUEZ, M.Á.; ROTH, A.M.; ROUSSEAU, G.X.; ROZEN, A.; SAYAD, E.; VAN SCHAIK, L.; SCHARENBROCH, B.C.; SCHIRRMANN, M.; SCHMIDT, O.; SCHRÖDER, B.; SEEBER, J.; SHASHKOV, M.P.; SINGH, J.; SMITH, S.M.; STEINWANDTER, M.; TALAVERA, J.A.; TRIGO, D.; TSUKAMOTO, J.; VALENÇA, A.W. de; VANEK, S.J.; VIRTO, I.; WACKETT, A.A.; WARREN, M.W.; WEHR, N.H.; WHALEN, J.K.; WIRONEN, M.B.; WOLTERS, V.; ZENKOVA, I.V.; ZHANG, W.; CAMERON, E.K.; EISENHAUER, N. Global distribution of earthworm diversity. Science, v.366, p.480-485, 2019. DOI: https://doi.org/10.1126/science.aax4851.
https://doi.org/10.1126/science.aax4851...
), regulating annual average temperature and precipitation and, consequently, driving soil moisture (Lavelle & Spain, 2001LAVELLE, P.; SPAIN, A. V. Soil ecology. [Dordrecht]: Kluwer Academic Publishers, 2001. 654p.; Blume et al., 2016BLUME, H.-P.; BRÜMMER, G.W.; FLEIGE, H.; HORN, R.; KANDELER, E.; KÖGEL-KNABNER, I.; KRETZSCHMAR, R.; STAHR, K.; WILKE, B.-M. Soil Science. Heidelberg: Springer, 2016. 618p. DOI: https://doi.org/10.1007/978-3-642-30942-7.
https://doi.org/10.1007/978-3-642-30942-...
; Rutgers et al., 2016RUTGERS, M.; ORGIAZZI, A.; GARDI, C.; RÖMBKE, J.; JÄNSCH, S.; KEITH, A.M.; NEILSON, R.; BOAG, B.; SCHMIDT, O.; MURCHIE, A.K.; BLACKSHAW, R.P.; PÉRÈS, G.; CLUZEAU, D.; GUERNION, M.; BRIONES, M.J.I.; RODEIRO, J.; PIÑEIRO, R.; COSÍN, D.J.D.; SOUSA, J.P.; SUHADOLC, M.; KOS, I.; KROGH, P.-H.; FABER, J.H.; MULDER, C.; BOGTE, J.J.; WIJNEN, H.J. VAN; SCHOUTEN, A.J.; ZWART, D. de. Mapping earthworm communities in Europe. Applied Soil Ecology, v.97, p.98-111, 2016. DOI: https://doi.org/10.1016/j.apsoil.2015.08.015.
https://doi.org/10.1016/j.apsoil.2015.08...
).

Table 2.
Data on the overall environmental (except soil) and management-related variables collected in the literature review, number of studies (percentage of total in parentheses) with the information available, and number of samples included in the database (No db)(1).

Altitude influences climate, especially temperature, and the type of vegetation, which affect soil and litter quantity and quality at the collection sites; therefore, it can have an important impact on earthworm abundance and species composition (Cardoso et al., 2014CARDOSO, G.B.X.; NADOLNY, H.; FEIJOO, A.; BROWN, G.G. Earthworm populations in an altitudinal gradient of the coastal Atlantic Rainforest in Paraná State, southern Brazil (Oligochaeta). In: PAVLÍCEK, T.; CARDET, P.; ALMEIDA, M.T.; PASCOAL, C.; CÁSSIO, F. (Ed.). Advances in Earthworm Taxonomy VI (Annelida: Oligochaeta). Heidelberg: Kasparek Verlag, 2014. p.74-86. Proceedings of the 6th International Oligochaeta Taxonomy Meeting (6th IOTM), Palmeira de Faro, April 22-25, 2013.). Climate-related variables are also fundamental to determine the best assessing season (dry or rainy) and if the weather, particularly rainfall regime and potential soil moisture, is favorable for sampling earthworm activity and abundance (Satchell, 1967SATCHELL, J.E. Lumbricidae. In: BURGES, A.; RAW, F. (Ed.). Soil biology. London: Academic Press, 1967. p.259-322.; Lavelle, 1983LAVELLE, P. The soil fauna of tropical savannas. II. The earthworms. In: BOURLIERE, F. (Ed.). Tropical savannas. Amsterdam: Elsevier, 1983. p.485-504. (Ecosystems of the world, 13).; Kale & Karmegam, 2010KALE, R.D.; KARMEGAM, N. The role of earthworms in tropics with emphasis on Indian ecosystems. Applied and Environmental Soil Science, v.2010, art.ID414356, 2010. DOI: https://doi.org/10.1155/2010/414356.
https://doi.org/10.1155/2010/414356...
). Due to the high seasonal variability in earthworm abundance (Nadolny, 2017NADOLNY, H. Estado da arte das minhocas como bioindicadoras da qualidade dos solos brasileiros. 2017. 135p. Tese (Doutorado) - Universidade Federal do Paraná, Curitiba.), especially in seasonally dry climates, the earthworm population should be assessed preferably towards the end of the rainy season, when most of the individuals have reached the adult stage (Lavelle, 1983LAVELLE, P. The soil fauna of tropical savannas. II. The earthworms. In: BOURLIERE, F. (Ed.). Tropical savannas. Amsterdam: Elsevier, 1983. p.485-504. (Ecosystems of the world, 13).), facilitating their identification (Richard et al., 2010RICHARD, B.; DECAËNS, T.; ROUGERIE, R.; JAMES, S.W.; PORCO, D.; HEBERT, P.D.N. Re-integrating earthworm juveniles into soil biodiversity studies: species identification through DNA barcoding. Molecular Ecology Resources, v.10, p.606-614, 2010. DOI: https://doi.org/10.1111/j.1755-0998.2009.02822.x.
https://doi.org/10.1111/j.1755-0998.2009...
).

Of the 12 climatic types described in Brazil (Alvares et al., 2013ALVARES, C.A.; STAPE, J.L.; SENTELHAS, P.C.; GONÇALVES, J.L. de M.; SPAROVEK, G. Köppen’s climate classification map for Brazil. Meteorologische Zeitschrift, v.22, p.711-728, 2013. DOI: https://doi.org/10.1127/0941-2948/2013/0507.
https://doi.org/10.1127/0941-2948/2013/0...
), only 9 were represented in the publications (Nadolny et al., 2020NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
). Climate at the sampling site - the main factor affecting earthworms in most population models (Phillips et al., 2019PHILLIPS, H.R.P.; GUERRA, C.A.; BARTZ, M.L.C.; BRIONES, M.J.I.; BROWN, G.; CROWTHER, T.W.; FERLIAN, O.; GONGALSKY, K.B.; HOOGEN, J. van den; KREBS, J.; ORGIAZZI, A.; ROUTH, D.; SCHWARZ, B.; BACH, E.M.; BENNETT, J.; BROSE, U.; DECAËNS, T.; KÖNIG-RIES, B.; LOREAU, M.; MATHIEU, J.; MULDER, C.; VAN DER PUTTEN, W.H.; RAMIREZ, K.S.; RILLIG, M.C.; RUSSELL, D.; RUTGERS, M.; THAKUR, M.P.; DE VRIES, F.T.; WALL, D.H.; WARDLE, D.A.; ARAI, M.; AYUKE, F.O.; BAKER, G.H.; BEAUSÉJOUR, R.; BEDANO, J.C.; BIRKHOFER, K.; BLANCHART, E.; BLOSSEY, B.; BOLGER, T.; BRADLEY, R.L.; CALLAHAM, M.A.; CAPOWIEZ, Y.; CAULFIELD, M.E.; CHOI, A.; CROTTY, F.V.; DÁVALOS, A.; COSIN, D.J.D.; DOMINGUEZ, A.; DUHOUR, A.E.; EEKEREN, N. VAN; CHRISTOPH EMMERLING, C.; FALCO, L.B.; FERNÁNDEZ, R.; FONTE, S.J.; FRAGOSO, C.; GUTIÉRREZ LÓPEZ, M.G.; HACKENBERGER, D.K.; HERNÁNDEZ, L.M.; HISHI, T.; HOLDSWORTH, A.R.; HOLMSTRUP, M.; HOPFENSPERGER, K.N.; HUERTA LWANGA, E.; HUHTA, V.; HURISSO, T.T.; IANNONE III, B.V.; IORDACHE, M.; JOSCHKO, M.; KANEKO, N.; KANIANSKA, R.; AIDAN M. KEITH, A.M.; KELLY, C.A.; KERNECKER, M.L.; KLAMINDER, J.; KONÉ, A.W.; KOOCH, Y.; KUKKONEN, S.T.; LALTHANZARA, H.; LAMMEL, D.R.; LEBEDEV, I.M.; LI, Y.; JESUS LIDON, J.B.; LINCOLN, N.K.; LOSS, S.R.; MARICHAL, R.; MATULA, R.; MOOS, J.H.; MORENO, G.; MORÓN-RÍOS, A.MUYS, B.; NEIRYNCK, J.; NORGROVE, L.; NOVO, M.; NUUTINEN, V.; VICTORIA NUZZO, V.; RAHMAN P, M.; PANSU, J.; SHISHIR PAUDEL, S.; PÉRÈS, G.; PÉREZ-CAMACHO, L.; PIÑEIRO, R.; PONGE, J.-F.; RASHID, M.I.; REBOLLO, S.; JAVIER RODEIRO-IGLESIAS, J.; RODRÍGUEZ, M.Á.; ROTH, A.M.; ROUSSEAU, G.X.; ROZEN, A.; SAYAD, E.; VAN SCHAIK, L.; SCHARENBROCH, B.C.; SCHIRRMANN, M.; SCHMIDT, O.; SCHRÖDER, B.; SEEBER, J.; SHASHKOV, M.P.; SINGH, J.; SMITH, S.M.; STEINWANDTER, M.; TALAVERA, J.A.; TRIGO, D.; TSUKAMOTO, J.; VALENÇA, A.W. de; VANEK, S.J.; VIRTO, I.; WACKETT, A.A.; WARREN, M.W.; WEHR, N.H.; WHALEN, J.K.; WIRONEN, M.B.; WOLTERS, V.; ZENKOVA, I.V.; ZHANG, W.; CAMERON, E.K.; EISENHAUER, N. Global distribution of earthworm diversity. Science, v.366, p.480-485, 2019. DOI: https://doi.org/10.1126/science.aax4851.
https://doi.org/10.1126/science.aax4851...
; Lavelle et al., 1993LAVELLE, P.; BLANCHART, E.; MARTIN, A.; MARTIN, S.; SPAIN, A.; TOUTAIN, F.; BAROIS, I.; SCHAEFER, R. A hierarchical model for decomposition in terrestrial ecosystems: application to soils of the humid tropics. Biotropica, v.25, p.130-150, 1993. DOI: https://doi.org/10.2307/2389178.
https://doi.org/10.2307/2389178...
) - was omitted in 46% of the studies, although approximately 60% of them included information on precipitation and temperature. Even though climate data can be derived from the collection site using GPS coordinates and climate-specific databases, information on particular climate conditions during or just prior to sampling (e.g., large rainfall events) are crucial to better understand the results obtained for the earthworm community (Satchell, 1967SATCHELL, J.E. Lumbricidae. In: BURGES, A.; RAW, F. (Ed.). Soil biology. London: Academic Press, 1967. p.259-322.).

Less than half (42%) of the studies described the biome and only 44% described the native vegetation of the sampling site (Table 2). Although this information can be easily obtained from other sources, more detail on the conditions of the vegetation are always a fundamental factor for assessing earthworm communities, since well-preserved or primary vegetation are more likely to have native species than secondary forests or highly disturbed sites (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). In addition, the age of regeneration of the vegetation can also have a key impact on earthworm abundance (Rousseau et al., 2014ROUSSEAU, G.X.; SILVA, P.R. dos S.; CELENTANO, D.; CARVALHO, C.J.R. de. Macrofauna do solo em uma cronosequência de capoeiras, florestas e pastos no Centro de Endemismo Belém, Amazônia Oriental. Acta Amazonica, v.44, p.499-512, 2014. DOI: https://doi.org/10.1590/1809-4392201303245.
https://doi.org/10.1590/1809-43922013032...
). Therefore, knowledge on the vegetation at the experimental sites is especially important because it allows determining the amount, type, and quality of the organic matter inputs made available both above- and belowground for earthworm consumption (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.).

Management-related variables

Eight management-related variables were identified and selected from the evaluated studies (Table 2). Human disturbance and soil management practices have major impacts on earthworm communities in Brazil (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.; Nadolny, 2017NADOLNY, H. Estado da arte das minhocas como bioindicadoras da qualidade dos solos brasileiros. 2017. 135p. Tese (Doutorado) - Universidade Federal do Paraná, Curitiba.) and were addressed in the majority of the studies included in the database (Nadolny et al., 2020NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
). However, reporting of management practices and land use history in the publications was highly variable. Current and former land use are important variables in determining earthworm populations, and information on both should be provided in earthworm sampling schemes. In this regard, the number of years in current land use was provided in 58% of the publications, i.e., for 410 sites, but only 28% of the authors indicated previous land use.

Agricultural cropping was the most frequently assessed land use system (70 studies), representing 322 sites, i.e., 52% of all data (Table 1). Approximately half (49%) of the studies also described the soil management systems and crop type at sampling time (Table 2). Information on the type of soil tillage is essential because conventional tillage can negatively affect earthworm populations, whereas no-tillage systems usually have positive effects (Briones & Schmidt, 2017BRIONES, M.J.I.; SCHMIDT, O. Conventional tillage decreases the abundance and biomass of earthworms and alters their community structure in a global meta-analysis. Global Change Biology, v.23, p.4396-4419, 2017. DOI: https://doi.org/10.1111/gcb.13744.
https://doi.org/10.1111/gcb.13744...
; Brown et al., 2003BROWN, G.G.; BENITO, N.P.; PASINI, A.; SAUTTER, K.D.; GUIMARÃES, M. de F.; TORRES, E. No-tillage greatly increases earthworm populations in Paraná state, Brazil. Pedobiologia, v.47, p.764-771, 2003. DOI: https://doi.org/10.1078/0031-4056-00256.
https://doi.org/10.1078/0031-4056-00256...
). Information on crop type and management is also important because these influence the amount and type of crop residues and their C:N ratio, which determine the food value for earthworms. Low C:N materials tend to decompose faster and have a higher N content, one of the main components of earthworms (11% N in dry matter), essential for their growth and reproduction (Huerta et al., 2005HUERTA, E.; FRAGOSO, C.; BAROIS, I.; LAVELLE, P. Enhancement of growth and reproduction of the tropical earthworm Polypheretima elongata (Megascolecidae) by addition of Zea mays and Mucuna pruriens var. utilis litter to the soil. European Journal of Soil Biology, v.41, p.45-53, 2005. DOI: https://doi.org/10.1016/j.ejsobi.2005.01.002.
https://doi.org/10.1016/j.ejsobi.2005.01...
, 2007HUERTA, E.; DIOS, D. de la O.-D.; NUNCIO, G. Incremento de la fertilidad del suelo mediante el uso de lombrices de tierra (Glossoscolecidae y Acanthodrilidae) y leguminosas (Arachis pintoi) en un suelo de traspatio. Ciencia Ergo Sum, v.14, p.172-176, 2007.).

Integrated production systems - such as agroforestry, integrated crop-livestock (agropastoral), integrated crop-livestock-forestry (agrosilvopastoral), and livestock-forestry (silvopastoral) systems - were reported in 32 studies and represented 26% of the sampled sites (Table 1). Pastures and integrated production systems, like agropastoral and agrosilvopastoral systems, tend to be good for earthworms (Lourente et al., 2007LOURENTE, E.R.P.; SILVA, R.F. da; SILVA, D.A. da; MARCHETTI, M.E.; MERCANTE, F.M. Macrofauna edáfica e sua interação com atributos químicos e físicos do solo sob diferentes sistemas de manejo. Acta Scientiarum. Agronomy, v.29, p.17-22, 2007. DOI: https://doi.org/10.4025/actasciagron.v29i1.60.
https://doi.org/10.4025/actasciagron.v29...
; Franchini et al., 2009FRANCHINI, J.C.; DEBIASI, H.; HOFFMANN-CAMPO, C.B.; PASINI, A.; SACOMAN, A.; SILVA, J.R. da; FRANÇA, C.; CARRARA, R. Abundância e diversidade da macrofauna do solo em diferentes fases de um sistema de integração lavoura-pecuária no Arenito Paranaense. In: WORKSHOP INTEGRAÇÃO LAVOURA-PECUÁRIA-FLORESTA NA EMBRAPA, 2009, Brasília. Anais. Brasília: Embrapa, 2009.; Marchão et al., 2009MARCHÃO, R.L.; LAVELLE, P.; CELINI, L.; BALBINO, L.C.; VILELA, L.; BECQUER, T. Soil macrofauna under integrated crop-livestock systems in a Brazilian Cerrado Ferralsol. Pesquisa Agropecuária Brasileira, v.44, p.1011-1020, 2009. DOI: https://doi.org/10.1590/S0100-204X2009000800033.
https://doi.org/10.1590/S0100-204X200900...
; Batista et al., 2014BATISTA, I.; CORREIA, M.E.F.; PEREIRA, M.G.; BIELUCZYK, W.; SCHIAVO, J.A.; ROUWS, J.R.C. Frações oxidáveis do carbono orgânico total e macrofauna edáfica em sistema de integração lavoura-pecuária. Revista Brasileira de Ciência do Solo, v.38, p.797-809, 2014. DOI: https://doi.org/10.1590/S0100-06832014000300011.
https://doi.org/10.1590/S0100-0683201400...
) and generally have higher earthworm population densities than annual crops, particularly in the tropics (Decaëns et al., 2004DECAËNS, T.; JIMÉNEZ, J.J.; BARROS, E.; CHAUVEL, A.; BLANCHART, E.; FRAGOSO, C.; LAVELLE, P. Soil macrofaunal communities in permanent pastures derived from tropical forest or savanna. Agriculture, Ecosystems and Environment, v.103, p.301-312, 2004. DOI: https://doi.org/10.1016/j.agee.2003.12.005.
https://doi.org/10.1016/j.agee.2003.12.0...
; Nunes et al., 2007NUNES, D.H.; PASINI, A.; BENITO, N.P.; BROWN, G.G. Minhocas como bioindicadoras da qualidade ambiental. Um estudo de caso na região de Jaguapitã, PR, Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.467-480.). Agroforestry systems are also beneficial to earthworm populations (Luizão et al., 2002LUIZÃO, R.C.C.; BARROS, E.; LUIZÃO, F.J.; ALFAIA, S.S. Soil biota and nutrient dynamics through litterfall in agroforestry system in Rondônia, Amazônia, Brazil. In: INTERNATIONAL TECHNICAL WORKSHOP ON BIOLOGICAL MANAGEMENT OF SOIL ECOSYSTEMS FOR SUSTAINABLE AGRICULTURE,. 2002, Londrina. Program, abstracts, and related documents. Londrina: Embrapa Soja, 2002. p.49-53. (Embrapa Soja. Documentos 182). Organization: George G. Brown, Mariangela Hungria, Lenita Jacob Oliveira, Sally Bunning and Adriana Montañez.; Brown et al., 2006bBROWN, G.G.; RÖMBKE, J.; HÖFER, H.; VERHAAGH, M.; SAUTTER, K.D.; SANTANA, D.L. de Q. Biodiversity and function of soil animals in Brazilian agroforestry systems. In: GAMA-RODRIGUES, A.C. da; BARROS, N.F. de; GAMA-RODRIGUES, E.F. da; FREITAS, M.S.M.; VIANA, A.P.; JASMIN, J.M.; MARCIANO, C.R.; CARNEIRO, J.G. de A. (Ed.). Sistemas agroflorestais: bases científicas para o desenvolvimento sustentável. Campos dos Goytacazes: Universidade Estadual do Norte Fluminense: Sociedade Brasileira de Sistemas Agroflorestais; Brasília: Embrapa Informação Tecnológica, 2006b. p.217-242., 2009BROWN, G.G.; MASCHIO, W.; FROUFE, L.C.M. Macrofauna do solo em sistemas agroflorestais e Mata Atlântica em regeneração nos municípios de Barra do Turvo, SP, e Adrianópolis, PR. Colombo: Embrapa Florestas, 2009. (Embrapa Florestas. Documentos, 184).; Römbke et al., 2009RÖMBKE, J.; SCHMIDT, P.; HÖFER, H. The earthworm fauna of regenerating forests and anthropogenic habitats in the coastal region of Paraná. Pesquisa Agropecuária Brasileira, v.44, p.1040-1049, 2009. DOI: https://doi.org/10.1590/S0100-204X2009000800037.
https://doi.org/10.1590/S0100-204X200900...
; Tarrá et al., 2012TARRÁ, I.L.C.; LUIZÃO, F. de J.; WANDELLI, E.V.; TEIXEIRA, W.G.; MORAIS, W.J.; FERNANDES, E.C.M.; BROCHEL, K.V.; PÉREZ, N.V. Grupos funcionais da macrofauna e macroporos do solo em sistemas agroflorestais da Amazônia central. Prospectiva, v.10, p.6-17, 2012. DOI: https://doi.org/10.15665/rp.v10i1.391.
https://doi.org/10.15665/rp.v10i1.391...
; Tapia-Coral et al., 2015TAPIA-CORAL, S.C.; VELÁSQUEZ, E.; JAMES, S.W.; LUIZÃO, F.J. Relações entre populações de minhocas (Annelida : Oligochaeta) e atributos químicos do solo em sistemas agroflorestais manejados na Amazônia Brasileira. In: ENCONTRO LATINO-AMERICANO DE ECOLOGIA E TAXONOMIA DE OLIGOQUETAS, 5.; SIMPÓSIO ENGENHEIROS EDÁFICOS, FERTILIDADE DO SOLO E TERRA PRETA DE ÍNDIO (TPI), 2015, Curitiba. Anais. [S.l.]: Federação Brasileira de Plantio Direto de Irrigação, 2015. p.41-42. 5º ELAETAO.), not only due to the protection offered by the greater vegetation cover (trees), which affects soil temperature and humidity, but also due to the diversification in the sources of the organic matter added to the soil.

Forestry plantations represented only 16% of the sampling sites and were addressed in five studies, mostly (77%) performed in sites located in Southern and Southeastern Brazil. Considering the area of 10 million ha that these plantations occupy in the country (IBGE, 2015IBGE. Instituto Brasileiro de Geografia e Estatística. Produção da Extração Vegetal e da Silvicultura. Rio de Janeiro, 2015. v.30, 48p.) and their economic importance, greater sampling efforts are needed regarding forestry systems. Tree species and management affect both surface litter and underground organic matter quality, affecting the role of these systems as earthworm habitats. Higher Ca contents in the litter of some tree species can positively affect soil pH over time, influencing earthworm populations (Reich et al., 2005REICH, P.B.; OLEKSYN, J.; MODRZYNSKI, J.; MROZINSKI, P.; HOBBIE, S.E.; EISSENSTAT, D.M.; CHOROVER, J.; CHADWICK, O.A.; HALE, C.M.; TJOELKER, M.G. Linking litter calcium, earthworms and soil properties: a common garden test with 14 tree species. Ecology Letters, v.8, p.811-818, 2005. DOI: https://doi.org/10.1111/j.1461-0248.2005.00779.x.
https://doi.org/10.1111/j.1461-0248.2005...
). The forestry species most common in Brazil are Eucalyptus and Pinus, both of which provide litter with low nutritional quality for earthworms (Bernhard-Reversat et al., 2001BERNHARD-REVERSAT, F.; LOUMETO, J.J.; LACLAU, J.P. Litterfall, litter quality and decomposition changes with eucalypt hybrids and plantation age. In: BERNHARD-REVERSAT, F. (Ed.). Effect of exotic tree plantations on plant diversity and biological soil fertility in the Congo savanna: with special reference to eucalypts. Bogor: CIFOR, 2001. p.23-30.); however, large populations can still be found in these plantations (Maschio et al., 2014MASCHIO, W.; VEZZANI, F.M.; BROWN, G.G. Earthworm populations in Eucalyptus spp. plantations at Embrapa Forestry, Brazil (Oligochaeta). In: PAVLÍČEK, T.; CARDET, P.; ALMEIDA, M.T.; PASCOAL, C.; CÁSSIO, F. (Ed.). Advances in Earthworm Taxonomy VI (Annelida: Oligochaeta). Heidelberg: Kasparek Verlag, 2014. p.114-126. Proceedings of the 6th International Oligochaeta Taxonomy Meeting (6th IOTM), Palmeira de Faro, April 22-25, 2013.; Silva et al., 2019SILVA, E. da; LIMA, O.G. de; ANDRADE, D.P. de; BROWN, G.G. Earthworm populations in forestry plantations (Araucaria angustifolia, Pinus elliottii) and Native Atlantic forest in Southern Brazil compared using two sampling methods. Pedobiologia, v.72, p.1-7, 2019. DOI: https://doi.org/10.1016/j.pedobi.2018.10.002.
https://doi.org/10.1016/j.pedobi.2018.10...
), where they may be providing important environmental services, like organic matter decomposition, nutrient cycling, and soil aggregation, a topic deserving further attention (Silva et al., 2019SILVA, E. da; LIMA, O.G. de; ANDRADE, D.P. de; BROWN, G.G. Earthworm populations in forestry plantations (Araucaria angustifolia, Pinus elliottii) and Native Atlantic forest in Southern Brazil compared using two sampling methods. Pedobiologia, v.72, p.1-7, 2019. DOI: https://doi.org/10.1016/j.pedobi.2018.10.002.
https://doi.org/10.1016/j.pedobi.2018.10...
).

Besides soil disturbance, the use of pesticides and fertilizers at the sampling site(s) must also be known. However, only 5% of the studies recorded pesticide use in the sampling sites and just 2% revealed the type of product used. Moreover, only 13% of the studies mentioned fertilization, including chemical, organic, or mineral fertilizers, and just 10% detailed which types were applied. These management practices can deeply influence earthworm communities, since several pesticides cause reductions in the fecundity and changes in the feeding behavior and mortality of earthworms (Pelosi et al., 2014PELOSI, C.; BAROT, S.; CAPOWIEZ, Y.; HEDDE, M.; VANDENBULCKE, F. Pesticides and earthworms. A review. Agronomy for Sustainable Development, v.34, p.199-228, 2014. DOI: https://doi.org/10.1007/s13593-013-0151-z.
https://doi.org/10.1007/s13593-013-0151-...
). However, little is known about the effects of most pesticides used in Brazilian agriculture on the earthworms actually present in the soils of the country (Sisinno et al., 2019 SISINNO, C.L.S.; NIEMEYER, J.C.; SEGAT, J.C.; OLIVEIRA FILHO, L.C.I.; NIVA, C.C.; BROWN, G.G. Importância e aplicações dos ensaios ecotoxicológicos com oligoquetas. In: NIVA, C.C.; BROWN, G.G. (Ed.). Ecotoxicologia terrestre: métodos e aplicações dos ensaios com oligoquetas. Brasília: Embrapa, 2019. p.45-70.). Some studies have reported that the application of fertilizers may increase earthworm densities because it also tends to increase plant production (Edwards & Lofty, 1982EDWARDS, C.A.; LOFTY, J.R. Nitrogenous fertilizers and earthworm populations in agricultural soils. Soil Biology and Biochemistry, v.14, p.515-521, 1982. DOI: https://doi.org/10.1016/0038-0717(82)90112-2.
https://doi.org/10.1016/0038-0717(82)901...
; Misra & Tripathy, 1988MISRA, M.K.; TRIPATHY, P.C. Effect of nitrogen fertilizer on plant and earthworm production in a tropical grassland in Orissa. Tropical Ecology, v.29, p.61-72, 1988.), generally increasing the input of organic matter (food for earthworms) into the soil. For the same reasons, the application of manure-based organic fertilizers also tends to be beneficial to earthworm populations (Tiwari, 1993TIWARI, S.C. Effects of organic manure and NPK fertilization on earthworm activity in an Oxisol. Biology and Fertility of Soils, v.16, p.293-295, 1993. DOI: https://doi.org/10.1007/BF00369307.
https://doi.org/10.1007/BF00369307...
; Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.). Conversely, the prolonged use of large quantities of inorganic N-based fertilizers can cause soil acidification, which, if not corrected, may decrease earthworm abundance (Ma et al., 1990MA, W.-C.; BRUSSAARD, L.; RIDDER, J.A. de. Long-term effects of nitrogenous fertilizers on grassland earthworms (Oligochaeta: Lumbricidae): their relation to soil acidification. Agriculture, Ecosystems and Environment, v.30, p.71-80, 1990. DOI: https://doi.org/10.1016/0167-8809(90)90184-F.
https://doi.org/10.1016/0167-8809(90)901...
).

Therefore, soil and crop management practices have major impacts on the soil as a habitat for earthworms, with intense positive or negative effects (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.), depending on the specific practice or on the combination of practices adopted. For this reason, standardizing the obtained data will provide important insights into possible mechanisms of population regulation in individual studies and future reviews on these topics.

Soil-related variables

In Brazil, the majority of the earthworm species belong to the endogeic ecological category, living in and feeding within the soil matrix, rarely coming out onto soil surface (Lavelle, 1988bLAVELLE, P. Earthworm activities and the soil system. Biology and Fertility of Soils, v.6, p.237-251, 1988b. DOI: https://doi.org/10.1007/BF00260820.
https://doi.org/10.1007/BF00260820...
; Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). Therefore, it is expected that soil type and physical and chemical attributes will affect their activity and populations in Brazilian ecosystems.

A total of 17 soil-related variables were selected from the publications and are listed in Table 3. Several studies in Brazil have highlighted the complex relationships between earthworm populations and some soil characteristics, particularly pH, organic matter, Ca, Mg, P, Al, texture and bulk density (Brown et al., 2003BROWN, G.G.; BENITO, N.P.; PASINI, A.; SAUTTER, K.D.; GUIMARÃES, M. de F.; TORRES, E. No-tillage greatly increases earthworm populations in Paraná state, Brazil. Pedobiologia, v.47, p.764-771, 2003. DOI: https://doi.org/10.1078/0031-4056-00256.
https://doi.org/10.1078/0031-4056-00256...
; Silva, 2010SILVA, E. da. Impact des plantations forestières sur l’abondance et la diversité des vers de terre, et sur les attributs physiques et chimiques du sol: mémoire de stage. Colombo: Embrapa Florestas: Universidade do Paraná; [Paris]: Université Paris-Est Créteil Val-de-Marne, 2010. 49p.; Lima, 2011LIMA, O.G. de. Indicadores físicos, químicos e biológicos da qualidade do solo em plantios florestais e floresta ombrófila mista na Embrapa Florestas, Colombo-PR. 2011. 67p. Dissertação (Mestrado) - Universidade Federal do Paraná, Curitiba.; Baretta et al., 2013BARETTA, D.; TESTA, M.; ROCHA, E.; LUCIANER, E.; BARTZ, M.L.C.; BROWN, G.G.; SIMIONI, F.J.; PAIANO, D.; SPAGNOLLO, E.; WILDNER, L. do P.; VEIGA, M. da. As minhocas e suas relações com atributos físico-químicos no Oeste e Meio-Oeste do Estado de Santa Catarina. In: SEMINÁRIO DE ENSINO, PESQUISA E EXTENÇÃO - CEO/UDESC, 3., 2013, Chapecó. [Anais]. Chapecó: UDESC, 2013. 3o SEPE.; Bartz et al., 2013BARTZ, M.L.C.; PASINI, A.; BROWN, G.G. Earthworms as soil quality indicators in Brazilian no-tillage systems. Applied Soil Ecology, v.69, p.39-48, 2013. DOI: https://doi.org/10.1016/j.apsoil.2013.01.011.
https://doi.org/10.1016/j.apsoil.2013.01...
). However, these relationships are difficult to establish, because earthworms inhabit a multivariate habitat, where several factors act and interact simultaneously, affecting the soil’s potential as a habitat for the development and activity of earthworm populations.

Table 3.
Soil-related variables, including soil type and chemical and physical parameters, identified in the literature review, number of studies (percentage of total in parentheses) with this information available, and number of samples included in the database (No db)(1).

The soil type of the sampling site was given in 80% of the studies. This factor is generally considered key for earthworm species, whose preferences vary in terms of soil texture, pH, or organic matter content, all largely determined by the type of soil, whose properties also strongly influence the bioavailability of chemical stressors such as metals or pesticides (Ortega-Calvo et al., 2015ORTEGA-CALVO, J.-J.; HARMSEN, J.; PARSONS, J.R.; SEMPLE, K.T.; AITKEN, M.D.; AJAO, C.; EADSFORTH, C.; GALAY-BURGOS, M.; NAIDU, R.; OLIVER, R.; PEIJNENBURG, W.J.G.M.; RÖMBKE, J.; STRECK, G.; VERSONNEN, B. From bioavailability science to regulation of organic chemicals. Environmental Science & Technology, v.49, p.10255-10264, 2015. DOI: https://doi.org/10.1021/acs.est.5b02412.
https://doi.org/10.1021/acs.est.5b02412...
; Romero-Freire et al., 2015ROMERO-FREIRE, A.; MARTÍN PEINADO, F.J.; DÍEZ ORTIZ, M. Influence of soil properties on the bioaccumulation and effects of arsenic in the earthworm Eisenia andrei. Environmental Science Pollution Research, v.22, p.15016-15028, 2015. DOI: https://doi.org/10.1007/s11356-015-4659-4.
https://doi.org/10.1007/s11356-015-4659-...
; Marchand et al., 2017MARCHAND, L.; BRUNEL-MUGUET, S.; LAMY, I.; MENCH, M.; PELOSI, C. Modulation of trace element bioavailability for two earthworm species after biochar amendment into a contaminated technosol. Ecotoxicology, v.26, p.1378-1391, 2017. DOI: https://doi.org/10.1007/s10646-017-1862-8.
https://doi.org/10.1007/s10646-017-1862-...
). This shows that the classification of soils can provide useful information on their physical and chemical properties, water regime, depth and nutrient content, important to determine earthworm populations at a given site (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.). However, little is known about the preference of earthworm species for soil types in Brazil - only one study on this topic has been performed so far, in the Cerrado region of northwestern São Paulo (Caballero, 1973CABALLERO, M.E.S. Bionomia dos oligochaeta terrestres da região Norte-Ocidental do Estado de São Paulo. 1973. Tese (Doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, São Paulo., 1976CABALLERO, M.E.L.S. Bionomia de oligochaeta terrestres da região Norte-Ocidental do Estado de São Paulo, Brasil. Ciência e Cultura, v.28, p.762-765, 1976.). Furthermore, unfortunately, the soil maps available for most regions of Brazil are still at geographic scales too gross for the adequate estimation of the soil types at a collection site, indicating that more precise and, preferably, primary data on soil types should be provided.

Soil pH was informed in 56% of the evaluated studies (Table 3), being the most mentioned of all soil attributes. Most Brazilian soils are naturally acid (Motta & Melo, 2009MOTTA, A.C.V.; MELO, V. de F. Química dos solos ácidos. In: MELO, V. de F.; ALLEONI, L.R.F. (Ed.). Química e mineralogia do solo: parte II: aplicações. Viçosa: Sociedade Brasileira de Ciência do Solo, 2009. v.2, p.313-371.), so the earthworms living in them are generally adapted to acidic conditions. However, there is little information on the pH preferences of Brazilian earthworm species (Steffen, 2012STEFFEN, G.P.K. Diversidade de minhocas e sua relação com ecossistemas naturais e alterados no estado do Rio Grande do Sul. 2012. 208p. Tese (Doutorado) - Universidade Federal de Santa Maria, Santa Maria.), which may also vary depending on soil type. Some species of earthworms of the Lumbricidae family, which is typical of cooler regions with a temperate climate, show a clear preference for particular soil pH intervals (Satchell, 1967SATCHELL, J.E. Lumbricidae. In: BURGES, A.; RAW, F. (Ed.). Soil biology. London: Academic Press, 1967. p.259-322.; Graefe & Beylich, 2003GRAEFE, U.; BEYLICH, A. Critical values of soil acidification for annelid species and the decomposer community. Newsletter on Enchytraeidae, v.8, p.51-55, 2003.), but only a few lumbricids actually inhabit Brazilian soils and those that do are all exotic and occur almost exclusively in the Southern region of the country (Brown et al., 2006aBROWN, G.G.; JAMES, S.W.; PASINI, A.; NUNES, D.H.; BENITO, N.P.; MARTINS, P.T.; SAUTTER, K.D. Exotic, peregrine, and invasive earthworms in Brazil: diversity, distribution, and effects on soils and plants. Caribbean Journal of Science, v.42, p.339-358, 2006a.). The common invasive species Pontoscolex corethrurus, from the Rhinodrilidae family, the most widespread earthworm in Brazil (Brown et al., 2006aBROWN, G.G.; JAMES, S.W.; PASINI, A.; NUNES, D.H.; BENITO, N.P.; MARTINS, P.T.; SAUTTER, K.D. Exotic, peregrine, and invasive earthworms in Brazil: diversity, distribution, and effects on soils and plants. Caribbean Journal of Science, v.42, p.339-358, 2006a.), inhabits soils with pH ranging from 4.5 to 6.2 (Knapper & Porto, 1979KNAPPER, C.F.U.; PORTO, R.P. Ocorrência de oligochaetas nos solos do Rio Grande do Sul. Acta Biologica Leopoldensia, v.1, p.137-166, 1979.; Steffen, 2012STEFFEN, G.P.K. Diversidade de minhocas e sua relação com ecossistemas naturais e alterados no estado do Rio Grande do Sul. 2012. 208p. Tese (Doutorado) - Universidade Federal de Santa Maria, Santa Maria.), while Amynthas spp. (Amynthas gracilis and Amynthas corticis) of the Megascolecidae family, also widely distributed in the country (Brown et al., 2006aBROWN, G.G.; JAMES, S.W.; PASINI, A.; NUNES, D.H.; BENITO, N.P.; MARTINS, P.T.; SAUTTER, K.D. Exotic, peregrine, and invasive earthworms in Brazil: diversity, distribution, and effects on soils and plants. Caribbean Journal of Science, v.42, p.339-358, 2006a.), live in soils with higher pH, ranging from 4.8 to 7.2 (Knapper & Porto, 1979KNAPPER, C.F.U.; PORTO, R.P. Ocorrência de oligochaetas nos solos do Rio Grande do Sul. Acta Biologica Leopoldensia, v.1, p.137-166, 1979.; Steffen, 2012STEFFEN, G.P.K. Diversidade de minhocas e sua relação com ecossistemas naturais e alterados no estado do Rio Grande do Sul. 2012. 208p. Tese (Doutorado) - Universidade Federal de Santa Maria, Santa Maria.). Soil pH also determines the availability of a number of other soil elements important for plant and animal life, especially bases, cation exchange capacity, and Al and P contents. In Brazil, liming is one of the most common agricultural and forestry practices to increase soil pH, and can have profound effects on plant production and earthworm populations (Lavelle et al., 1995aLAVELLE, P.; CHAUVEL, A.; FRAGOSO, C. Faunal activity in acid soils. In: DATE, R.A.; GRUNDON, N.J.; RAYMENT, G.E.; PROBERT, M.E. (Ed.). Plant soil interactions at low pH. Netherlands: Kluwer Academic Publishers, 1995a. p.201-211. DOI: https://doi.org/10.1007/978-94-011-0221-6_29.
https://doi.org/10.1007/978-94-011-0221-...
). In many cases, liming is performed with calcium carbonate, increasing Ca availability in the soils.

Even though Ca is one of the most important elements to determine in a soil chemical analysis due to its direct relationship to pH, its contents were reported in less than half (48%) of the studies. The Ca content can be close to 1% dry mass in earthworms tissues (Paoletti et al., 2003PAOLETTI, M.G.; BUSCARDO, E.; VANDERJAGT, D.J.; PASTUSZYN, A; PIZZOFERRATO, L.; HUANG, Y.-S.; CHUANG, L.-T.; MILLSON, M.; CERDA, H.; TORRES, F.; GLEW, R.H. Nutrient content of earthworms consumed by Ye’Kuana Amerindians of the Alto Orinoco of Venezuela. Proceedings of the Royal Society B - Biological Sciences, v.270, p.249-257, 2003. DOI: https://doi.org/10.1098/rspb.2002.2141.
https://doi.org/10.1098/rspb.2002.2141...
), and this element plays a vital role in earthworm metabolism, being used to produce CaCO3 in the calciferous glands, reduce CO2 levels in the body, and regulate the pH of the gut (Piearce, 1972PIEARCE, T.G. The calcium relations of selected lumbricidae. Journal of Animal Ecology, v.41, p.167-188, 1972.; Versteegh et al., 2014VERSTEEGH, E.A.A.; BLACK, S.; HODSON, M.E. Environmental controls on the production of calcium carbonate by earthworms. Soil Biology and Biochemistry, v.70, p.159-161, 2014. DOI: https://doi.org/10.1016/j.soilbio.2013.12.013.
https://doi.org/10.1016/j.soilbio.2013.1...
). In fact, the physiological activities involving Ca in earthworms are indicative of a mechanism of C sequestration in soils (Briones et al., 2008BRIONES, M.J.I.; OSTLE, N.J.; PIEARCE, T.G. Stable isotopes reveal that the calciferous gland of earthworms is a CO2-fixing organ. Soil Biology and Biochemistry, v.40, p.554-557, 2008. DOI: https://doi.org/10.1016/j.soilbio.2007.09.012.
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).

Data on the K and Mg cations in the soil were provided in approximately half (50 and 48%, respectively) of the studies; however, soil potential acidity (H+Al), cation exchange capacity, base saturation, and sum of bases were rarely provided (29-34%). These factors are generally well related to soil fertility levels (Ribeiro et al., 1999RIBEIRO, A.C.; GUIMARÃES, P.T.G.; ALVAREZ V., V.H. (Ed.). Recomendações para o uso de corretivos e fertilizantes em Minas Gerais: 5a Aproximação. Viçosa: Comissão de Fertilidade do Solo do Estado de Minas Gerais, 1999. 359p.), and, therefore, commonly determined in soil quality assessments, especially in agricultural fields (Raij, 1987RAIJ, B. van. Avaliação da fertilidade do solo. 3.ed. Piracicaba-SP: Potafos, 1987. 142p. ). However, the relationships between earthworm populations and the potential acidity, cation exchange capacity, base saturation, and K and Mg contents of the soils are not well known, particularly in Brazilian ecosystems.

Although soil P is generally tightly bound and is one of the most limiting elements in Brazilian soils (Malavolta, 2006MALAVOLTA, E. Manual de nutrição mineral de plantas. São Paulo: Agronômica Ceres, 2006. 631p.), it was reported in only 47% of the studies. Therefore, there is still no clear relationship between P levels in the soil and earthworm populations, even though higher earthworm abundance has been associated with higher soil P contents (Bartz et al., 2013BARTZ, M.L.C.; PASINI, A.; BROWN, G.G. Earthworms as soil quality indicators in Brazilian no-tillage systems. Applied Soil Ecology, v.69, p.39-48, 2013. DOI: https://doi.org/10.1016/j.apsoil.2013.01.011.
https://doi.org/10.1016/j.apsoil.2013.01...
). It has also been shown that soil P is important for the metabolism of earthworms, whose tissues contain about 0.5% P (Paoletti et al., 2003PAOLETTI, M.G.; BUSCARDO, E.; VANDERJAGT, D.J.; PASTUSZYN, A; PIZZOFERRATO, L.; HUANG, Y.-S.; CHUANG, L.-T.; MILLSON, M.; CERDA, H.; TORRES, F.; GLEW, R.H. Nutrient content of earthworms consumed by Ye’Kuana Amerindians of the Alto Orinoco of Venezuela. Proceedings of the Royal Society B - Biological Sciences, v.270, p.249-257, 2003. DOI: https://doi.org/10.1098/rspb.2002.2141.
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), and a unique phosphagen, called phospholombricine (Wilson et al., 1992WILSON, E.F.; BROWN, G.G.; DREWES, C.D. Characterization of phosphorus metabolism during six stages of development in the earthworm Eisenia foetida using 31P-NMR. Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, v.102B, p.383-388, 1992. DOI: https://doi.org/10.1016/0305-0491(92)90139-I.
https://doi.org/10.1016/0305-0491(92)901...
).

Despite being well known to positively affect soil quality (Sparling et al., 2008SPARLING, G.; LILBURNE, L.; VOJVODIC-VUKOVIC, M. Provisional targets for soil quality indicators in New Zealand. Lincoln: Manaaki Whenua Press, 2008. 64p. (Landcare Research Science Series, n.34).) and fauna populations and activity (Lavelle et al., 2001LAVELLE, P.; BARROS, E.; BLANCHART, E.; BROWN, G.; DESJARDINS, T.; MARIANI, L.; ROSSI, J.-P. SOM management in the tropics: why feeding the soil macrofauna? Nutrient Cycling in Agroecosystems, v.61, p.53-61, 2001.), soil organic matter content is not always included in routine soil analyses in Brazil (Raij, 1987RAIJ, B. van. Avaliação da fertilidade do solo. 3.ed. Piracicaba-SP: Potafos, 1987. 142p. ). Hence, only 34% of the studies provided soil C values (Table 3). Of these, some showed positive relationships between earthworm abundance and soil organic matter content (e.g., Brown et al., 2004BROWN, G.G.; JAMES, S.W.; SAUTTER, K.D.; PASINI, A.; BENITO, N.P.; NUNES, D.H.; KORASAKI, V.; SANTOS, É.F. dos; MATSUMURA, C.; MARTINS, P.T.; PAVÃO, A.; SILVA, S.H. da; GARBELINI, G.; TORRES, E. Avaliação das populações de minhocas como bioindicadores ambientais no Norte e Leste do Estado do Paraná. In: SARAIVA, O.F. (Ed.). Resultados de pesquisa da Embrapa Soja 2003: manejo de solos, plantas daninhas e agricultura de precisão. Londrina: Embrapa Soja, 2004. p.30-46. (Embrapa Soja. Documentos, 253).), considered the main energy source for the earthworm metabolism (Martin et al., 1992MARTIN, A.; MARIOTTI, A.; BALESDENT, J.; LAVELLE, P. Soil organic matter assimilation by a geophagous tropical earthworm based on delta 13C measurements. Ecology, v.73, p.118-128, 1992. DOI: https://doi.org/10.2307/1938725.
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). Endogeic earthworm species, the most common in Brazil, must ingest large amounts of soil due to their generally low C content and have also developed a mutualistic digestion system with bacteria in their gut to help them increase the assimilation of the ingested organic materials (Lavelle et al., 1995bLAVELLE, P.; LATTAUD, C.; TRIGO, D.; BAROIS, I. Mutualism and biodiversity in soils. Plant and Soil, v.170, p.23-33, 1995b. DOI: https://doi.org/10.1007/BF02183052.
https://doi.org/10.1007/BF02183052...
).

Only 12% of the studies provided soil N values, probably because total N estimates are not included in routine soil analyses in Brazilian laboratories (Raij, 1987RAIJ, B. van. Avaliação da fertilidade do solo. 3.ed. Piracicaba-SP: Potafos, 1987. 142p. ). Earthworm tissues have high proportions of N, in general about 70% protein in dry matter (Paoletti et al., 2003PAOLETTI, M.G.; BUSCARDO, E.; VANDERJAGT, D.J.; PASTUSZYN, A; PIZZOFERRATO, L.; HUANG, Y.-S.; CHUANG, L.-T.; MILLSON, M.; CERDA, H.; TORRES, F.; GLEW, R.H. Nutrient content of earthworms consumed by Ye’Kuana Amerindians of the Alto Orinoco of Venezuela. Proceedings of the Royal Society B - Biological Sciences, v.270, p.249-257, 2003. DOI: https://doi.org/10.1098/rspb.2002.2141.
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), even though the abundance of this element in the soil is low. Clearly, this is an essential element for earthworm populations in the soils, especially regarding their growth and reproduction; however, relationships between soil N and earthworms have not been frequently established (Huerta et al., 2005HUERTA, E.; FRAGOSO, C.; BAROIS, I.; LAVELLE, P. Enhancement of growth and reproduction of the tropical earthworm Polypheretima elongata (Megascolecidae) by addition of Zea mays and Mucuna pruriens var. utilis litter to the soil. European Journal of Soil Biology, v.41, p.45-53, 2005. DOI: https://doi.org/10.1016/j.ejsobi.2005.01.002.
https://doi.org/10.1016/j.ejsobi.2005.01...
, 2007HUERTA, E.; DIOS, D. de la O.-D.; NUNCIO, G. Incremento de la fertilidad del suelo mediante el uso de lombrices de tierra (Glossoscolecidae y Acanthodrilidae) y leguminosas (Arachis pintoi) en un suelo de traspatio. Ciencia Ergo Sum, v.14, p.172-176, 2007.). Although the soil C:N ratio was evaluated in only 9% of the studies, being the least reported soil variable, it may still be important for earthworm communities, since it was identified as one of the factors governing the distribution of earthworm species in German soils (Römbke et al., 2012RÖMBKE, J.; JÄNSCH, S.; ROSS-NICKOLL, M.; TOSCHKI, A.; HÖFER, H.; HORAK, F.; RUSSELL, D.; BURKHARDT, U.; SCHMITT, H. Erfassung und analyse des bodenzustands im Hinblick auf die umsetzung und weiterentwicklung der nationalen biodiversitätsstrategie. Dessau-Roblau: Umweltbundesamt, 2012. 386p. (UBA. Texte n. 33/2012).).

Soil texture, particularly clay content, is a key factor for earthworm activity because it generally influences both soil C content and water retention in different pore sizes (Feller & Beare, 1997FELLER, C.; BEARE, M.H. Physical control of soil organic matter dynamics in the tropics. Geoderma, v.79, p.69-116, 1997. DOI: https://doi.org/10.1016/S0016-7061(97)00039-6.
https://doi.org/10.1016/S0016-7061(97)00...
; Costa et al., 2013COSTA, A. da; ALBUQUERQUE, J.A.; COSTA, A. da; PÉRTILE, P.; SILVA, F.R. da. Water retention and availability in soils of the State of Santa Catarina-Brazil: effect of textural classes, soil classes and lithology. Revista Brasileira de Ciência do Solo, v.37, p.1535-1548, 2013. DOI: https://doi.org/10.1590/s0100-06832013000600010.
https://doi.org/10.1590/s0100-0683201300...
). The preference of many lumbricid earthworm species for specific soil textural classes was studied by Guild (1948)GUILD, W.J.M. Studies on the relationship between earthworms and soil fertility. Annals of Applied Biology, v.35, p.181-192, 1948. DOI: https://doi.org/10.1111/j.1744-7348.1948.tb07360.x.
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, who found that medium-textured soils appeared to be more favorable than sandy or clayey ones. More recently, Vendrame et al. (2009)VENDRAME, P.R.S.; MARCHÃO, R.L.; BRITO, O.R.; GUIMARÃES, M. de F.; BECQUER, T. Relationship between macrofauna, mineralogy and exchangeable calcium and magnesium in Cerrado Oxisols under pasture. Pesquisa Agropecuária Brasileira, v.44, p.996-1001, 2009. DOI: https://doi.org/10.1590/S0100-204X2009000800031.
https://doi.org/10.1590/S0100-204X200900...
observed that some earthworm species in the Cerrado preferred soils with high levels of kaolinite; however, very little information is available on the soil textural and mineralogical preferences of Brazilian species (Steffen, 2012STEFFEN, G.P.K. Diversidade de minhocas e sua relação com ecossistemas naturais e alterados no estado do Rio Grande do Sul. 2012. 208p. Tese (Doutorado) - Universidade Federal de Santa Maria, Santa Maria.). Soil textural classes were provided in 44% of the studies, and the specific contents of clay, sand, and silt were given in 35-39% of them. Stony or very coarse sandy soils may restrict earthworm populations (Guild, 1948GUILD, W.J.M. Studies on the relationship between earthworms and soil fertility. Annals of Applied Biology, v.35, p.181-192, 1948. DOI: https://doi.org/10.1111/j.1744-7348.1948.tb07360.x.
https://doi.org/10.1111/j.1744-7348.1948...
), mainly because of their low water retention capacity, but also of the presence of sand quartz crystals that may damage the earthworm’s epidermis (Curry, 2004CURRY, J.P. Factors affecting the abundance of earthworms in soils. In: EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. p.91-113.). At the other end of the textural triangle, heavy clay soils have a higher tendency to compaction, which can hinder earthworm activity, reducing soil displacement and ingestion (Klok et al., 2007KLOK, C.; FABER, J.; HEIJMANS, G.; BODT, J.; VAN DER HOUT, A. Influence of clay content and acidity of soil on development of the earthworm Lumbricus rubellus and its population level consequences. Biology and Fertility of Soils, v.43, p.549-556, 2007. DOI: https://doi.org/10.1007/s00374-006-0135-0.
https://doi.org/10.1007/s00374-006-0135-...
). Furthermore, clayey soils often have lower water infiltration rates, which can negatively affect water availability in the soil profile due to a higher runoff, reducing earthworm activity (Edwards & Bohlen, 1996EDWARDS, C.A.; BOHLEN, P.J. Biology and ecology of earthworms. 3rd ed. London: Chapman & Hall, 1996. 426p.). Under more intense rainfall, these soils could become flooded, particularly in flatlands, complicating gas exchanges and earthworm respiration. However, most earthworms can survive short periods of anaerobiosis in case their burrows are flooded after heavy rains (Lee, 1985LEE, K.E. Earthworms: their ecology and relationships with soils and land use. Sydney: Academic Press, 1985. 411p.).

Soil moisture is an extremely important factor for the survival of earthworms (Lee, 1985LEE, K.E. Earthworms: their ecology and relationships with soils and land use. Sydney: Academic Press, 1985. 411p.; Edwards, 2004EDWARDS, C.A. (Ed.). Earthworm ecology. 2nd ed. Boca Raton: CRC Press, 2004. 441p.) - first, because their bodies are formed by > 80% H2O (Caballero, 1979CABALLERO, M.E.S. Influência dos fatores hígricos sobre a biomassa de Pheretima hawayana e Pontoscolex corethrurus (Annelida, Oligochaeta). Zoo Intertrópica, v.2, p.1-11, 1979.; Ayres & Guerra, 1981AYRES, I.; GUERRA, R.A.T. Água como fator limitante na distribuição das minhocas (Annelida, Oligochaeta) da Amazônia Central. Acta Amazonica, v.11, p.77-86, 1981. DOI: https://doi.org/10.1590/1809-43921981111077.
https://doi.org/10.1590/1809-43921981111...
) and, second, because they breathe through their skin, which needs to be kept continuously moist. However, this attribute was reported in only 17% of the evaluated publications. The ideal available water content for earthworms differs from one species to another and depends on the respective soil properties, especially texture and the amount of organic matter (Edwards & Bohlen 1996EDWARDS, C.A.; BOHLEN, P.J. Biology and ecology of earthworms. 3rd ed. London: Chapman & Hall, 1996. 426p.). Therefore, gravimetric soil moisture measurements must be related to soil texture and compared with overall water holding capacity. Lavelle et al. (1987)LAVELLE, P.; BAROIS, I.; CRUZ, I.; FRAGOSO, C.; HERNANDEZ, A.; PINEDA, A.; RANGEL, P. Adaptive strategies of Pontoscolex corethrurus (Glossoscolecidae, Oligochaeta), a peregrine geophagous earthworm of the humid tropics. Biology and Fertility of Soils, v.5, p.188-194, 1987. DOI: https://doi.org/10.1007/BF00256899.
https://doi.org/10.1007/BF00256899...
, for instance, found that the ideal soil moisture values for the optimum development of P. corethrurus were all well above the field capacity of 35% H2O in a Mexican clayey loam soil, with 31% clay and 40% sand. Hydrophilic species, such as most representatives of the Ocnerodrilidae, Sparganophilidae, Almidae, and Criodrilidae families (Righi, 1997RIGHI, G. Minhocas da América Latina: diversidade, função e valor. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 26., 1997, Rio de Janeiro. Informação, globalização, uso do solo: anais. Viçosa: SBCS , 1997.), as well as some members of the Glossoscolecidae, Rhinodrilidae, and Acanthodrilidae families (Ayres & Guerra, 1981AYRES, I.; GUERRA, R.A.T. Água como fator limitante na distribuição das minhocas (Annelida, Oligochaeta) da Amazônia Central. Acta Amazonica, v.11, p.77-86, 1981. DOI: https://doi.org/10.1590/1809-43921981111077.
https://doi.org/10.1590/1809-43921981111...
; Gavrilov, 1981GAVRILOV, K. Oligochaeta. In: HURLBERT, S.H.; RODRIGUEZ, G.; SANTOS, N.D. dos (Ed.). Aquatic biota of Tropical South America: part 2: Anarthropoda. San Diego: San Diego State University, 1981. p.170-190.; Barrion & Litsinger, 1997BARRION, A.T.; LITSINGER, J.A. Dichogaster nr. curgensis Michaelsen (Annelida: Octochaetidae): an earthworm pest of terraced rice in the Philippine Cordilleras. Crop Protection, v.16, p.89-93, 1997. DOI: https://doi.org/10.1016/S0261-2194(96)00058-0.
https://doi.org/10.1016/S0261-2194(96)00...
; Bartz et al., 2012BARTZ, M.L.C.; JAMES, S.W.; PASINI, A.; BROWN, G.G. New earthworm species of Glossoscolex Leuckart, 1835 and Fimoscolex Michaelsen, 1900 (Clitellata: Glossoscolecidae) from Northern Paraná, Brazil. Zootaxa, v.3458, p.59-85, 2012. DOI: https://doi.org/10.11646/zootaxa.3458.1.3.
https://doi.org/10.11646/zootaxa.3458.1....
), live in saturated soils with a low oxygen pressure. For instance, 33 of the 40 species from Central Amazon were found only next to water bodies, while 10% were collected in upland sites, being presumably more resistant to soil moisture variations (Ayres & Guerra, 1981AYRES, I.; GUERRA, R.A.T. Água como fator limitante na distribuição das minhocas (Annelida, Oligochaeta) da Amazônia Central. Acta Amazonica, v.11, p.77-86, 1981. DOI: https://doi.org/10.1590/1809-43921981111077.
https://doi.org/10.1590/1809-43921981111...
). Unfortunately, very little is known regarding the soil moisture preferences of most Brazilian earthworm species, which is an indicative that this is another important topic for basic biology research on earthworms.

Sampling and earthworm-related attributes

The most widely used method of assessing earthworm abundance in tropical countries is hand-sorting, following the tropical soil biology and fertility (TSBF) method (Anderson & Ingram, 1993ANDERSON, J.M.; INGRAM, J.S.I. (Ed.). Tropical soil biology and fertility: a handbook of methods. 2nd ed. Wallingford: CAB International, 1993. 221p.), combined with formalin expulsion of large earthworms (Römbke et al., 2006RÖMBKE, J.; SOUSA, J.-P.; SCHOUTEN, T.; RIEPERT, F. Monitoring of soil organisms: a set of standardized field methods proposed by ISO. European Journal of Soil Biology, v.42, p.S61-S64, 2006. Supplement 1. DOI: https://doi.org/10.1016/j.ejsobi.2006.07.016.
https://doi.org/10.1016/j.ejsobi.2006.07...
). The TSBF method (ISO, 2018ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018.), originally devised by Lavelle (1988a)LAVELLE, P. Assessing the abundance and role of invertebrate communities in tropical soils: aims and methods. Journal of African Zoology, v.102, p.275-283, 1988a., recommends digging and hand-sorting five to ten holes of 25x25 cm width and 30 cm depth - 15 cm in ISO (2018)ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018. - in each area/plot/treatment/site to be studied (Anderson & Ingram, 1993ANDERSON, J.M.; INGRAM, J.S.I. (Ed.). Tropical soil biology and fertility: a handbook of methods. 2nd ed. Wallingford: CAB International, 1993. 221p.). Although the method has some limitations, especially when collecting smaller individuals and cocoons (Lavelle et al., 1981LAVELLE, P.; MAURY, M.E.; SERRANO, V. Estudio cuantitativo de la fauna del suelo en la región de Laguna Verde, Veracruz: Epoca de lluvias. Instituto de Ecología de México, v.6, p.75-105, 1981.; Jiménez et al., 2006JIMÉNEZ, J.J.; LAVELLE, P.; DECAËNS, T. The efficiency of soil hand-sorting in assessing the abundance and biomass of earthworm communities. Its usefulness in population dynamics and cohort analysis studies. European Journal of Soil Biology, v.42, p.S225-S230, 2006. Supplement 1. DOI: https://doi.org/10.1016/j.ejsobi.2006.07.031.
https://doi.org/10.1016/j.ejsobi.2006.07...
), it has been widely used in the tropics and subtropics, with a reasonable success rate (Rossi et al., 2006ROSSI, J.-P.; MATHIEU, J.; COOPER, M.; GRIMALDI, M. Soil macrofaunal biodiversity in Amazonian pastures: matching sampling with patterns. Soil Biology and Biochemistry, v.38, p.2178-2187, 2006. DOI: https://doi.org/10.1016/j.soilbio.2006.01.020.
https://doi.org/10.1016/j.soilbio.2006.0...
). All publications selected for this review applied this method or adaptations of it (Nadolny et al., 2020NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
), which included digging shallower (10 cm) or deeper (40 cm) holes, increasing the size of the holes (40x40 cm), and increasing (n = 36 holes) or decreasing (n = 3) sample frequency number.

Most studies (73%) used standard sizes of 25x25 cm or smaller for the sampling holes (Nadolny et al., 2020NADOLNY, H.; SANTOS, A.; DEMETRIO, W.; FERREIRA, T.; MAIA, L. dos S.; CONRADO, A.C.; BARTZ, M.; GARRASTAZU, M.; SILVA, E. da; BARETTA, D.; PASINI, A.; VEZZANI, F.; SOUSA, J.P.; CUNHA, L.; MATHIEU, J.; LAVELLE, P.; RÖMBKE, J.; BROWN, G. Data from: recommendations for assessing earthworm populations in Brazilian ecosystems. Dryad Dataset, v.13, 2020. DOI: https://doi.org/10.5061/dryad.4md0s64.
https://doi.org/10.5061/dryad.4md0s64...
). The main limitation to smaller holes is that larger-sized earthworms are frequently cut and, therefore, not adequately sampled. To avoid this, when adult earthworms larger than 12.5 cm, i.e., half the width, are present, wider holes of 30x30 or 40x40 cm should be dug to reduce earthworm amputation. If there are only small earthworms with mean lengths of 5-10 cm, such as the size of P. corethrurus, then the standard hole of 25x25 cm is suitable. If anecic or large-bodied earthworms - which form casts and open burrows on the soil surface and usually respond to chemical extractants - are present at the site, then sampling should follow the ISO (2018)ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018. norm. This consists of hand-sorting soil from holes 50x50 cm wide and 20 cm deep, and posteriorly applying 5 to 10 L of the chemical extractant AITC, at the concentration of 0.1 g L-1; if giant earthworms, greater than 50 cm in length, are present, then the sampling area should be expanded to 4 m2 and 80 L AITC should be applied (Römbke, 2007RÖMBKE, J. Searching for a standardization of quantitative terrestrial oligochaete sampling methods: the ISO methodology. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.497-505. ; ISO, 2018ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018.). AITC replaced formalin as the recommended chemical extractant in the latest ISO norm (ISO, 2018ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018.), due the possible carcinogenic properties of formalin. However, only one study has tested the efficiency of AITC in Brazil (Ressetti et al., 2008RESSETTI, R.R.; DIONÍSIO, J.A.; MOTTA, A.C.V. Comparação entre doses de Alil isotiocianato e a solução de formaldeído na extração de minhocas. Bragantia, v.67, p.25-33, 2008. DOI: https://doi.org/10.1590/S0006-87052008000100003.
https://doi.org/10.1590/S0006-8705200800...
), which was higher than formalin in cropping systems, but lower in pasture and native forest. Therefore, further research is needed to evaluate the adoption of AITC as the recommended chemical extractant in the country.

There is little published information on the ideal size of soil monoliths for quantitative earthworm sampling. Two Brazilian studies (Baretta et al., 2007BARETTA, D.; BROWN, G.G.; JAMES, S.W.; CARDOSO, E.J.B.N. Earthworm populations sampled using collection methods in Atlantic forests with Araucaria angustifolia. Scientia Agricola, v.64, p.384-392, 2007. DOI: https://doi.org/10.1590/S0103-90162007000400009.
https://doi.org/10.1590/S0103-9016200700...
; Cardoso et al., 2014CARDOSO, G.B.X.; NADOLNY, H.; FEIJOO, A.; BROWN, G.G. Earthworm populations in an altitudinal gradient of the coastal Atlantic Rainforest in Paraná State, southern Brazil (Oligochaeta). In: PAVLÍCEK, T.; CARDET, P.; ALMEIDA, M.T.; PASCOAL, C.; CÁSSIO, F. (Ed.). Advances in Earthworm Taxonomy VI (Annelida: Oligochaeta). Heidelberg: Kasparek Verlag, 2014. p.74-86. Proceedings of the 6th International Oligochaeta Taxonomy Meeting (6th IOTM), Palmeira de Faro, April 22-25, 2013.) found that 40x40 or 50x50-cm wide holes were better than the standard TSBF-sized holes of 25x25 cm for collecting worms, probably because the experimental sites had large or fast-moving species. Caballero (1976)CABALLERO, M.E.L.S. Bionomia de oligochaeta terrestres da região Norte-Ocidental do Estado de São Paulo, Brasil. Ciência e Cultura, v.28, p.762-765, 1976. tested many hole sizes and proposed that the 50x50 or 60x60-cm dimensions were the best for her research conditions, that included large earthworm species. However, due to the size of these holes, more effort and time was needed to dig and hand-sort the soil from them, making it a procedure difficult or impossible to adopt in smaller plots (experimental fields) and when human resources are limited.

Most studies (98%) reported sampling depth (Table 4), which was 15 cm or less in 18% of them. The ideal sample depth should be chosen based on: the characteristics of the earthworm community, such as the presence or not of larger species that build deep galleries; soil structure, including the depth of specific layers; anthropogenic influence, like ploughing depth; and sampling season or climatic conditions at and/or just before the sampling date. During the rainy season, most earthworms tend to be concentrated in the 0-10-cm layer (Lavelle & Kohlmann, 1984LAVELLE, P.; KOHLMANN, B. Étude quantitative de la macrofaune du sol dans une forêt tropicale humide du Mexique (Bonampak, Chiapas). Pedobiologia, v.27, p.377-393, 1984.), but, in the dry season, they often migrate to greater depths and/or coil up into a ball, staying in a state of quiescence or even diapause (Abe & Buck, 1985ABE, A.S.; BUCK, N. Oxygen uptake of active and aestivating earthworm Glossoscolex paulistus (Oligochaeta, Glossoscolecidae). Comparative Biochemistry and Physiology, v.81, p.63-66, 1985. DOI: https://doi.org/10.1016/0300-9629(85)90267-1.
https://doi.org/10.1016/0300-9629(85)902...
; Drumond et al., 2013DRUMOND, M.A.; GUIMARÃES, A.Q.; EL BIZRI, H.R.; GIOVANETTI, L.C.; SEPÚLVEDA, D.G.; MARTINS, R.P. Life history, distribution and abundance of the giant earthworm Rhinodrilus alatus RIGHI 1971: conservation and management implications. Brazilian Journal of Biology, v.73, p.699-708, 2013. DOI: https://doi.org/10.1590/S1519-69842013000400004.
https://doi.org/10.1590/S1519-6984201300...
), when they are often more difficult to collect and/or in a lower abundance. However, even in the rainy season, particularly when it coincides with warmer temperatures, earthworms often move below 10-cm depth, especially at the hottest time of the day, in order to escape excessive heat and the lower soil moisture in the upper layer (Lavelle, 1983LAVELLE, P. The soil fauna of tropical savannas. II. The earthworms. In: BOURLIERE, F. (Ed.). Tropical savannas. Amsterdam: Elsevier, 1983. p.485-504. (Ecosystems of the world, 13)., 1988bLAVELLE, P. Earthworm activities and the soil system. Biology and Fertility of Soils, v.6, p.237-251, 1988b. DOI: https://doi.org/10.1007/BF00260820.
https://doi.org/10.1007/BF00260820...
). Therefore, it is important to choose the adequate monolith size and sample depth, based on previous observations in-situ, which will reveal the possible occurrence of larger earthworm species and the depth of their activity, as well as where larger holes should be dug (Caballero, 1976CABALLERO, M.E.L.S. Bionomia de oligochaeta terrestres da região Norte-Ocidental do Estado de São Paulo, Brasil. Ciência e Cultura, v.28, p.762-765, 1976.; Römbke et al., 2005RÖMBKE, J.; JÄNSCH, S.; DIDDEN, W. The use of earthworms in ecological soil classification and assessment concepts. Ecotoxicology and Environmental Safety, v.62, p.249-265, 2005. DOI: https://doi.org/10.1016/j.ecoenv.2005.03.027.
https://doi.org/10.1016/j.ecoenv.2005.03...
; Cardoso et al., 2014CARDOSO, G.B.X.; NADOLNY, H.; FEIJOO, A.; BROWN, G.G. Earthworm populations in an altitudinal gradient of the coastal Atlantic Rainforest in Paraná State, southern Brazil (Oligochaeta). In: PAVLÍCEK, T.; CARDET, P.; ALMEIDA, M.T.; PASCOAL, C.; CÁSSIO, F. (Ed.). Advances in Earthworm Taxonomy VI (Annelida: Oligochaeta). Heidelberg: Kasparek Verlag, 2014. p.74-86. Proceedings of the 6th International Oligochaeta Taxonomy Meeting (6th IOTM), Palmeira de Faro, April 22-25, 2013.).

Table 4.
Variables associated with earthworm sampling identified in the literature review, number of studies (percentage of total in parentheses) with this information available, and number of samples included in the database (No db)(1).

Earthworm biomass is rarely reported in soil fauna studies in Brazil (Brown & James, 2007BROWN, G.G.; JAMES, S.W. Ecologia, biodiversidade e biogeografia das minhocas no Brasil. In: BROWN, G.G.; FRAGOSO, C. (Ed.). Minhocas na América Latina: biodiversidade e ecologia. Londrina: Embrapa Soja, 2007. p.297-381.). It was only measured in 31% of the publications (314 sites), likely due to the additional effort - especially time - needed for this task (Bignell et al., 2008BIGNELL, D.; CONSTANTINO, R.; CSUZDI, C.; KARYANTO, A.; KONATÉ, S.; LOUZADA, J.; SUSILO, F.-X.; TONDOH, J.E.; ZANETTI, R. Macrofauna. In: MOREIRA, F.M.S.; HUISING, E.J.; BIGNELL, D.E. (Ed.). A handbook of tropical soil biology: sampling and characterization of below-ground biodiversity. London: Earthscan, 2008. p.43-83.). Still, biomass measurements must be standardized for use in ecological investigations and comparisons between studies. Active earthworms normally have a variable proportion of soil in their intestine, generally 10-20% fresh weight, which can affect the precision of the fresh earthworm biomass measurements (University of Minnesota, 2020UNIVERSITY OF MINNESOTA. Great Lakes Worm Watch: research methods. Available at: <Available at: http://greatlakeswormwatch.org/research/methods_worms_biomass.html >. Accessed on: Apr. 15 2020.
http://greatlakeswormwatch.org/research/...
). For this reason, some researchers allow earthworms to void their guts before sacrificing and weighing them (Lee, 1985LEE, K.E. Earthworms: their ecology and relationships with soils and land use. Sydney: Academic Press, 1985. 411p.); however, this procedure is not feasible when collecting earthworms in the field, where they are often amputated and/or injured, which can affect the survival of the collected individuals. The best way to measure biomass in order to allow comparisons between studies is to determine ash-free dry weights with a freeze-drier (Brown et al., 1998BROWN, G.G.; HENDRIX, P.F.; BEARE, M.H. Earthworms (Lumbricus rubellus) and the fate of 15N in surface-applied sorghum residues. Soil Biology and Biochemistry, v.30, p.1701-1705, 1998. DOI: https://doi.org/10.1016/S0038-0717(97)00277-0.
https://doi.org/10.1016/S0038-0717(97)00...
). However, once this procedure is done, it is no longer possible to identify individuals, but it is possible to make some projections of gut weight for a subsample of the species, making a correction for the others (Martin, 1986MARTIN, N.A. Earthworm biomass: influence of gut content and formaldehyde preservation on live-to-dry weight ratios of three common species of pasture lumbricidae. Soil Biology and Biochemistry, v.18, p.245-250, 1986. DOI: https://doi.org/10.1016/0038-0717(86)90056-8.
https://doi.org/10.1016/0038-0717(86)900...
). Therefore, a practical way to present biomass data is to specify how weighing was done; normally fresh weight, including intestinal content, is determined in alcohol at concentrations of 70% or greater or in formaldehyde from 4 to 10% (Baker & Lee, 1993BAKER, G.H.; LEE, K.E. Earthworms. In: CARTER, M.R. (Ed.). Soil sampling and methods of analysis. Boca Raton: Lewis Publishers, 1993. p.359-371.). If there is time or it is possible, an adjustment can be made to obtain the corrected biomass (without gut contents) using data from the species. Material preserved in formaldehyde is easier to weigh and less dehydrated than that in ethanol, since the water content of the formaldehyde solution is higher (generally > 90%) than that of ethanol (generally < 30%) (Baker & Lee, 1993BAKER, G.H.; LEE, K.E. Earthworms. In: CARTER, M.R. (Ed.). Soil sampling and methods of analysis. Boca Raton: Lewis Publishers, 1993. p.359-371.; ISO, 2018ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018.). However, for molecular studies using DNA, ethanol (> 90%) is recommended.

The ISO (2015)ISO. International Organization for Standardization. ISO 11268-3:2014: Soil quality: effects of pollutants on earthworms: Part 3: Guidance on the determination of effects in field situations. Brussels, 2015. proposal is regularly used in ecotoxicological standard field tests. According to Dunger & Fiedler (1997)DUNGER, W.; FIEDLER, H.J. Methoden der bodenbiologie. Jena: Gustav Fischer Verlag, 1997. 539p., earthworms seem to lose about 10 to 20% of their mass during fixation, but, since this is about the same as the mass of the gut content, compensation is not necessary. The measured fresh mass can be converted to dry mass by multiplying its value by a factor of 0.15 (Petersen & Luxton, 1982PETERSEN, H.; LUXTON, M. A comparative analysis of soil fauna populations and their role in decomposition processes. Oikos, v.39, p.288-388, 1982. DOI: https://doi.org/10.2307/3544689.
https://doi.org/10.2307/3544689...
), which was determined using mineral soil dwellers (endogeic species) from European grassland sites; therefore, this factor may vary considerably depending on the ecological category, i.e., it is smaller in epigeic species than in endogeic ones. Hence, adaptations may be needed in local studies, as well as further work to obtain more precise estimates for the species in-situ.

After sampling, species are normally identified in the laboratory, since most of the common tropical and subtropical earthworms require dissection for an adequate identification (Righi, 1997RIGHI, G. Minhocas da América Latina: diversidade, função e valor. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 26., 1997, Rio de Janeiro. Informação, globalização, uso do solo: anais. Viçosa: SBCS , 1997.). For this reason, in Brazil, earthworm identification is not an easy task, having been performed in only 24% of the studies (Table 4). The proper identification of species improves the assessments of their interactions with the soil environment, and the estimation of their potential effects on soil properties and processes, which are closely linked to their ecological category/functional group (Brown et al., 2000BROWN, G.G.; BAROIS, I.; LAVELLE, P. Regulation of soil organic matter dynamics and microbial activity in the drilosphere and the role of interactions with other edaphic functional domains. European Journal of Soil Biology, v.36, p.177-198, 2000. DOI: https://doi.org/10.1016/S1164-5563(00)01062-1.
https://doi.org/10.1016/S1164-5563(00)01...
). Therefore, in as far as is possible, the collected species should be identified, in order to evaluate the impacts of land use on biodiversity and to estimate possible impacts of species on soil and associated ecosystem services (Podgaiski et al., 2011PODGAISKI, L.R.; MENDONÇA, M. de S.; PILLAR, V.D. O uso de atributos funcionais de invertebrados terrestres na ecologia: o que, como e por quê? Oecologia Australis, v.15, p.835-853, 2011. DOI: https://doi.org/10.4257/oeco.2011.1504.05.
https://doi.org/10.4257/oeco.2011.1504.0...
).

Recommendations for standardization

Studies relating earthworms to environmental and soil factors must consider the multifactorial nature of soil-animal-plant relationships, and evaluate a minimum set of variables that are important determinants of earthworm populations in terrestrial ecosystems. A list of these variables and a brief explanation of the reasons for their recommendation is given in Table 5, aiming to increase the number of publications that simultaneously provide data on a wide range of soil and environmental variables. A good, detailed description of the sampling site, climate, and vegetation and soil type, including previous and current land uses and soil management, could improve the understanding of the relationships between environmental factors and earthworm abundance and diversity at a particular site.

Table 5.
List of standard environmental, soil, and earthworm attributes to be provided/measured in studies on earthworm populations.

Soil variables, evaluated in less than 50% of the studies, are not so difficult or costly to determine, and can be easily incorporated into the project budget of studies involving earthworm and/or soil fauna sampling. Furthermore, it is not difficult to obtain a soil sample for routine soil analysis, which would be enough to adequately describe the soil chemical and physical environment of a site as an earthworm habitat. Considering the data evaluated in this review, it is recommended that future studies evaluating earthworm populations measure, from at least a composite soil sample: pH; moisture; Ca, Mg, K, P, C, and N contents by combustion; CEC; and soil texture, including percentage of sand, silt, and clay. However, if time and resources are not an issue, then samples could be taken from around or within each earthworm monolith (Swift & Bignell, 2001SWIFT, M.; BIGNELL, D. Standard methods for assessment of soil biodiversity and land use practice. Bogor: International Centre for Research in Agroforestry, 2001. 40p.). Furthermore, those variables should be measured using standard methods, in order to enhance comparisons between studies. Slightly similar lists were proposed by ISO (2018)ISO. International Organization for Standardization. ISO 23611-1:2018: Soil quality: sampling of soil invertebrates: Part 1 : Hand-sorting and extraction of earthworms. 2nd ed. [Brussels], 2018. and Swift & Bignell (2001)SWIFT, M.; BIGNELL, D. Standard methods for assessment of soil biodiversity and land use practice. Bogor: International Centre for Research in Agroforestry, 2001. 40p. for soil biodiversity studies worldwide.

The data on earthworm abundance and biomass measured at each site and/or individual treatment type should be either presented in a table in the publication, or as an appendix or supplementary table to the paper. The data shown in the figures as means per set of treatments or as a part of larger “groups” of soil animals (e.g., detritivores or engineers) should be individualized for earthworms (and other macrofauna groups) per treatment and provided in supplementary tables, so that they can be used in future comparative studies (Nadolny, 2017NADOLNY, H. Estado da arte das minhocas como bioindicadoras da qualidade dos solos brasileiros. 2017. 135p. Tese (Doutorado) - Universidade Federal do Paraná, Curitiba.). A preliminary, rapid sampling at a site is essential before undertaking intensive sampling, to reveal the size of the earthworms present and the depth of their activities and also to determine the intensity and appropriate soil volume for sampling.

Although earthworm species-level data provide essential information on niches and the relationships of species presence and abundance with soil, vegetation and management variables, total earthworm biomass and density are easier to determine and were considered by Doube & Schmidt (1997)DOUBE, B.M.; SCHMIDT, O. Can the abundance or activity of soil macrofauna be used to indicate the biological health of soils? In: PANKHURST, C.; DOUBE, B.M.; GUPTA, V.V.S.R. (Ed.). Biological indicators of soil health and sustainable productivity. New York: CAB International, 1997. p.265-295. as more stable (less variable) than data on species in studies using earthworms as environmental bioindicators. However, given the large number of native and endemic species present in Brazilian soils (Brown et al., 2013BROWN, G.G.; CALLAHAM, M.A.; NIVA, C.C.; FEIJOO, A.; SAUTTER, K.D.; JAMES, S.W.; FRAGOSO, C.; PASINI, A.; SCHMELZ, R.M. Terrestrial oligochaete research in Latin America: the importance of the Latin American meetings on oligochaete ecology and taxonomy. Applied Soil Ecology, v.69, p.2-12, 2013. DOI: https://doi.org/10.1016/j.apsoil.2012.12.006.
https://doi.org/10.1016/j.apsoil.2012.12...
), it is important to obtain data on these species and any preferences they might have for particular soil and environmental conditions, in order to enhance conservation and management efforts. The identification of earthworm species requires expertise, and, in many cases, proper identification is only possible by a taxonomist, although there are a few specialists in Brazil and elsewhere who can also identify Brazilian earthworm species. When the identification of the material is not possible, care should be taken to preserve the collected species correctly, and contact should be made with an appropriate specialist or institution that can receive and store the material (e.g., a museum collection) to be identified later (if possible), reducing the risk of loss or damage by improper conservation.

The above suggestions for data collection are valid not only for earthworm sampling, but also for overall soil macrofauna population studies. This should facilitate the standardization of the information provided in publications and comparisons between/among them. Considering the growing scientific body in soil zoology and overall interest in the potential use of earthworms and other soil animals as soil and environmental quality indicators (Bünemann et al., 2018BÜNEMANN, E.K.; BONGIORNO, G.; BAI, Z.; CREAMER, R.E.; DEYN, G. de; GOEDE, R. de; FLESKENS, L.; GEISSEN, V.; KUYPER, T.W.; MÄDER, P.; PULLEMAN, M.; SUKKEL, W.; GROENIGEN, J.W. van; BRUSSAARD, L. Soil quality - a critical review. Soil Biology and Biochemistry, v.120, p.105-125, 2018. DOI: https://doi.org/10.1016/j.soilbio.2018.01.030.
https://doi.org/10.1016/j.soilbio.2018.0...
), the use of standard methods of analysis and data collection are essential to optimize research efforts, allow a wider use of the data and derived publications, and increase the life-span and usefulness of studies on earthworm populations in Brazilian ecosystems and worldwide.

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Publication Dates

  • Publication in this collection
    21 Sept 2020
  • Date of issue
    2020

History

  • Received
    28 Aug 2018
  • Accepted
    31 Mar 2020
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