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Revista Brasileira de Entomologia

Print version ISSN 0085-5626

Rev. Bras. entomol. vol.58 no.4 São Paulo Oct./Dec. 2014  Epub Nov 28, 2014

http://dx.doi.org/10.1590/s0085-56262014005000007 

Diversity and aspects of the ecology of social wasps (Vespidae, Polistinae) in Central Amazonian "terra firme" forest

 

 

Alexandre SomavillaI; Marcio Luiz de OliveiraII; Orlando Tobias SilveiraIII

IPrograma de Pós-Graduação em Entomologia, Instituto Nacional de Pesquisas da Amazônia. alexandre.s@hotmail.com
IICoordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, 69060-001 Manaus-AM, Brazil. mlolivei@inpa.gov.br
IIICoordenação de Zoologia, Museu Paraense Emílio Goeldi, Av. Perimetral s/n, Campus de Pesquisas, 66040-170 Belém-PA, Brazil. orlando@museu-goeldi.br

 

 


ABSTRACT

Diversity and aspects of the ecology of social wasps (Vespidae, Polistinae) in Central Amazonian "terra firme" forest. The knowledge of social wasp richness and biology in the Amazonian region is considered insufficient. Although the Amazonas state is the largest in the region, until now only two brief surveys were conducted there. Considering that the systematic inventory of an area is the first step towards its conservation and wise use, this study presents faunal data on social wasp diversity in a 25 km2 area of "terra firme" (upland forest) at the Ducke Reserve, Manaus, Amazonas, Brazil. Wasps were collected in the understory, following a protocol of three collectors walking along 60 trails 1,000 m in extension for 16 days between August and October 2010. Methods used were active search of individuals with entomological nets and nest collecting. Fifty-eight species of social wasps, allocated in 13 genera, were recorded; 67% of the collected species belong to Polybia, Agelaia and Mischocyttarus; other genera were represented by only four species or less. The most frequent species in active searches were Agelaia fulvofasciata (DeGeer, 1773), Agelaia testacea (Fabricius, 1804) and Angiopolybia pallens (Lepeletier, 1836). Twelve species were collected in nests. Prior to this study, 65 Polistinae species were deposited at the INPA Collection. Collecting in the study grid, an area not previously sampled for wasps, resulted in an increase of 25% species, and species richness was 86. According to the results, there is evidence that the diversity of social wasps at the Ducke Reserve is even higher, making it one of the richest areas in the Brazilian Amazonia.

Keywords: Active search; Ducke Reserve; Insecta; PPBio; structured inventory.


 

 

Vespidae is a family of insects commonly designated wasps that includes over 4,600 valid species worldwide and is found in more abundance in the tropical region, despite the wide distribution of some species (Carpenter & Marques 2001). Brazilian social wasps include only Polistinae, the richest in the world, with 319 species (Carpenter & Marques 2001). Species in this subfamily belong to three tribes: Mischocyttarini (Mischocyttarus, with 117 species), Polistini (Polistes, with 38 species), and Epiponini (20 genera, 164 species) (Carpenter 2004).

The number of faunal inventories of social wasps in Brazil can still be considered low. There are some studies on the diversity and density of social wasps in different regions and biomes in Brazil, such as in agroecosystems and anthropogenic environments in the southeast and northeast (e.g., Lima et al. 2000; Auad et al. 2010), in the savanna (cerrado) in the southeast, midwest and northeast (e.g., Lima et al. 2010; Tanaka-Jr. & Noll 2011; Silva et al. 2011; Grandinete & Noll 2013), in rocky fields in the southeast and northeast (e.g., Silva-Pereira & Santos 2006; Prezoto & Clemente 2010), in the "Pantanal" biome (Almeida et al. 2014) and several environments in the Atlantic rainforest in the southeast and south (e.g. Gomes & Noll 2009; Somavilla et al. 2010; Tanaka-Jr & Noll 2011; Locher et al. 2014; Togni et al. 2014).

For the Brazilian Amazonian rainforest, we highlight the work of Raw (1998), Silveira (2002), Silveira et al. (2005), Morato et al. (2008), Silveira et al. (2008) and Silva & Silveira (2009). For the Amazonas state, Silveira et al. (2008) collected social wasps in the adjoining "várzea" (seasonally flooded forest) in Mamirauá and areas of "terra firme" (upland forest) in Alvarães through active search for wasps and colonies and Malaise trapping, and recorded 46 and 42 species, respectively. Until now, the two sites received the greatest collection effort in the state. However, lack of standardization among the methodologies employed in these studies hampers the comparison of aspects like composition, distribution, and abundance of the social wasp faunas of these regions.

The pioneer in the use of a standardized and replicable wasp collecting methodology in the Amazon Region was Silveira (2002). This author studied the social wasps of the Caxiuanã National Forest, Pará state, using a simple sampling protocol based mainly on the search for individuals and colonies along 1,000 m long trails and the installation of ten Malaise traps for 60 sampling days; 79 species were recorded. In 2006, working in the same area, Silva & Silveira (2009) identified 65 species of social wasps using a collection protocol consisting in active search of individuals and colonies and the use of ten Malaise traps in a 5x5 km grid pertaining to the Biodiversity Research Program (PPBio) for 44 days. The advantage of using this grid is that it allows the adoption of more standardized and comparable protocols, making it possible to obtain indirect estimates of relative abundance of most species and the construction of accumulation curves, useful to assess the efficiency of the collection methods applied in inventories.

Considering that the inventory of an area is the first step towards its conservation and wise use, this paper presents data on social wasp diversity in the understory of a 25 km2 grid of PPBio, located at the Ducke Reserve, Manaus, Amazonas, Brazil.

 

MATERIAL AND METHODS

Study area. Sampling was conducted at the Ducke Reserve ("Reserva Florestal Adolpho Ducke"), comprising an area of approximately 100 km2 of "terra firme" rainforest near Manaus, Amazonas, Brazil (02º55' to 03º01'S and 59º53' to 59º59.5' W) (Baccaro et al. 2008). The climate is classified as humid tropical, with mean annual relative humidity of about 80% and mean annual precipitation of 1,750 - 2,500 mm, the rainiest months falling between November and May (Ribeiro & Adis 1984). Mean annual temperature is 26ºC, with little variation during the year (Marques-Filho et al. 1981). The land is dominated by plateaus with altitudes ranging from 80 to 140 m (Pires 1974). Soils are clayey in plateaus; in slopes, the clay fraction gradually decreases, being replaced by sand in bottomlands (Ribeiro et al. 1999). Vegetation is characterized as lowland tropical rainforest, with fairly closed canopy and shady understory, characterized by the abundance of palm trees (Ribeiro et al. 1999; Costa et al. 2008).

Sampling design. Collection was conducted on a 5x5 km grid composed of two perpendicular sets of 5 km long trails meeting every 1,000 m. We collected on twelve trails, six running east-west and six north-south, totaling 60 km (Magnusson et al. 2005; Baccaro et al. 2008).

Wasp collection. Wasps were collected with an entomological net in the understory. Collection consisted in the visual search for colonies and flying individuals along the 60 segments 1,000 m-long of the grid. While a collector walked the middle of a trail, two others walked along the sides, visually scanning the nearest 5 m. One of the collectors was native to the region, skilled at locating objects inside the forest. Generally, searches occurred from 8 am to 4 pm, totaling about 130 sampling hours (approximately 2 hours per trail) during eight days in August and eight days in October 2010. All wasps and colonies collected were georeferenced using a Global Positioning System. The environment where each individual or colony was collected was classified as plateau/slope in continuous forest, clearing, or bottomland close to a "igarapé" (local name for creeks and streams).

Collected specimens and nests were deposited in the Invertebrate Collection of the National Research Institute of Amazonia (Instituto Nacional de Pesquisas da Amazônia, INPA). Species were identified with reference to the keys in Richards (1978) and Carpenter & Marques (2001) and compared with specimens deposited at the INPA's Invertebrate Collection and Museu Paraense Emílio Goeldi.

Data analysis. For data analysis, trails were numbered 1 to 60, according to layout, 1 to 30 being those running from east to west, and 31 to 60 from north to south. Relative abundance was estimated indirectly from species frequency in the samples (number of samples in which the species was recorded/total number of samples) (Silveira 2002), a record meaning any encounter with the species, individual or colony, and colony meaning simply an encounter.

All analyses were performed with the R program, version 2.13 (R Development Core Team 2011), Vegan package (Oksanen et al. 2008). To evaluate the process of species addition in response to increasing collecting effort, a species accumulation curve was constructed taking into consideration the presence/absence of each species in all the 60 trails 1,000 m-long of the grid. Estimates of the asymptotic maximum number of species for the study area were also obtained using the Jackknife 1, Chao 1, and Bootstrap 1 estimators, in the same software. For the comparison of the collected data in all 1,000 m trails, ecological indices were used, such as Shannon-Wiener's diversity index (H'), which attributes a greater weight to rare species and is relatively independent of sample size, and Pielou's homogeneity index (J), which refers to the distribution patterns of individuals among species, one of the components of diversity.

 

RESULTS

We identified 58 social wasp species, in 13 genera (Table I). Sixty-seven percent of the collected species belong to three genera: Polybia Lepeletier (21 species), Agelaia Ducke (ten species), and Mischocyttarus de Saussure (eight species). Aside from these, Polistes Latreille and Angiopolybia Araujo, had four and three species, respectively. The other genera were represented by two or one species only. One species each of Agelaia, Mischocyttarus (Clypeopolybia), and Polybia (Myrapetra) could not be determined to species level.

According to the Jackknife 1, Chao 1, and Bootstrap 1 estimators, the number of species of Vespidae for the Ducke Reserve grid can reach 60. In the species accumulation curve, the number of species almost reaches the asymptote for 60 trails walked, and only a few species are added from the 30th trail onwards (Fig. 1).

 

 

In active search routes, 708 specimens were recorded and collected, mostly in flight (97.8%). The most frequent species in active search paths were Agelaia fulvofasciata, Agelaia testacea and Angiopolybia pallens (Table I), totaling 58% of the findings. Few species occurred in samples in a frequency greater than 20%, while the majority (47 species) were often below 10%. Thirty-eight species were represented by one or two individuals, mainly of the genera Polybia (14), Mischocyttarus (6), and Polistes (4). Within the genus Polybia, comprising 21 species in the study area, only Polybia rejecta, Polybia sericea, and Polybia liliacea were recorded with frequencies greater than 10%. The most frequent species of Mischocyttarus was Mischocyttarus labiatus, with five individuals.

Location of colonies was a rare event when compared to capture of individuals with entomological net. Eighteen colonies of social wasps, belonging to 12 species, were found: Agelaia constructor (1), Agelaia pallipes (1), Angiopolybia pallens (1), Mischocyttarus collaris (1), Polybia bistriata (1), Polybia dubitata (1), Polybia jurinei (1), Polybia liliacea (1), Polybia occidentalis (2), Polybia rejecta (1), Protopolybia bituberculata (1), Synoeca virginea (1), and five uninhabited nests of Mischocyttarus (1), Polybia (3), and Polistes (1) which could not be determined to species level.

Most colonies (10) were found on the abaxial side of leaves, especially palms (Arecaceae), and a species of Marantaceae close to streams; those of Polybia bistriata, Polybia dubitata, Polybia occidentalis, Protopolybia bituberculata, and Mischocyttarus collaris were found on this substrate. Colonies of Angiopolybia pallens, Polybia jurinei, Polybia liliacea, and Polybia rejecta were hanging from branches. The nest of Synoeca virginea was wrapped around a thin branch, while that of Agelaia pallipes was inside a tree trunk, and that of Agelaia constructor was inside a burrow excavated in the soil.

The richness on trails varied from two to ten species. Few diversity values exceeded 1.9, which is considered high in this study (Table II). However, homogeneity was high on most trails, showing a better species distribution along them; on trail 11, all individuals collected belonged to different species.

The 708 individuals and colonies collected were obtained at 425 collection points on the grid. Species were unevenly distributed in the three distinct environments where collection was conducted. Plateau/slope areas had the highest number of species, followed by bottomlands with streams and by clearings (Table III).

 

 

DISCUSSION

The social wasp fauna of the Ducke Reserve known until now consists of 65 species of Polistinae, collected by several researchers and deposited at INPA's Invertebrate Collection. The collections performed at the PPBio grid added 26 species, raising to 86 the number of known species. Nevertheless, taxonomic composition varied regarding the material at the INPA's collection, since 31 species previously collected in Ducke Reserve were not found in the study grid, mainly due to the active search method employed. Some wasps of genera Brachygastra, Metapolybia, Parachartergus and Pseudopolybia were only collected using Malaise traps and suspended Malaise traps, according to the INPA Collection.

The number of species obtained is high (58), and more so than that of other areas studied in Amazonia, except at the Caxiuanã National Forest PPBio grid. One reason for the greater richness obtained by Silva & Silveira (2009) at Caxiuanã is related with field work duration, which was 44 days at Caxiuanã and 16 at Ducke. Another reason was the inclusion of ten Malaise traps randomly distributed on Caxiuanã trails, which we chose not to do at Ducke. Anyway, we suggest that the two PPBio grids (Ducke and Caxiuanã) are very similar with respect to number of species and even genera (58 and 65; 13 and 12, respectively).

There are different methods to sample social wasps; however, few studies have attempted to propose a standardization of these methods or to establish comparable and adequate protocols to survey the fauna of a given site. An important factor to consider in the implementation of novel social wasp sampling protocols is the distribution pattern of these organisms (Silveira 2002; Silva & Silveira 2009) or, when using traps, finding the most efficient ones to collect the target group and dispose them in a standardized manner (Noll & Gomes 2009).

This study corroborates the results of Silva & Silveira (2009), who considered active search the most efficient method for collecting Vespidae, mainly close to the forest ground and in the understory. The use of three collectors, as performed by those authors, was also considered crucial to the development of the work, since searching trail center, ends, and edges allows more sightings. Therefore, we believe that the collection protocol adopted in this work and by Silva & Silveira (2009) can be used in studies of social wasp diversity, especially when working on pre-established transects.

Moreover, the richness found (58 species) and estimated (60) are similar; thus, finding more species would require more detailed searches. In this area, probably, it would be very difficult to collect another wasp species in the understory. The best would be to use other methods, exploring other forest strata, such as the canopy (hanging Malaise trap) or attraction traps. This result suggests that the effort applied was sufficient to assess the Vespidae species composition in the study area.

Of the 58 species of social wasps found, some, like Agelaia fulvofasciata, Agelaia pallipes, Agelaia testacea, Angiopolybia pallens, and Polybia rejecta, are considered common in Amazonian environments (Silveira 2002; Silveira et al. 2005; Silva & Silveira 2009). Others, like Chartergellus amazonicus, Clypearia apicipennis and Epipona tatua, were rare and probably have restricted distribution, as they are rarely collected in inventories (Silveira 2002).

In relation to frequency, Agelaia fulvofasciata repeated the pattern of being recorded more frequently, as in Caxiuanã (Silva & Silveira 2009). This species was collected in almost 90% of the samples, in all environment types of the Ducke Reserve grid. The fact that it builds big colonies, well protected in cavities, may be the reason for its success in the Amazonian rainforest. Moreover, this species seems to prefer clearings, because a significant number of individuals were found in this environment, possibly due to higher solar incidence and warmth. Angiopolybia pallens was also very common, a result also found by Silveira (2002) at Caxiuanã. In this study, it was collected in 50% of the samples, especially near streams, suggesting a preference for humid and shaded situations. The latter two species are certainly the most collected and common in Amazonian rainforests (Silveira 2002). Agelaia testacea also occurred frequently (in about 70% of the samples); it is common in many environments in Amazonia, and its large size (about 25 mm) facilitates its location and collection.

Species not frequent in the grid, such as Polybia rejecta and Polybia sericea, were most often recorded in clearings and were rarely captured in close forest or near streams. Furthermore, the only Polybia rejecta colony was also found in an open area. On the contrary, most records of Agelaia angulata, Angiopolybia obidensis, and Synoeca surinama were obtained in closed forest, with abundance of palms. Agelaia pallipes and Agelaia centralis were collected in all kinds of environment, and were similarly distributed in different areas along the grid. Mischocyttarus labiatus and Polistes canadensis occurred only in clearings and southernmost trails, closer to Manaus urban area.

At the Ducke Reserve, most individuals and colonies occurred in the northern part of the grid, more preserved and composed predominantly by closed forest. In the south, closer to Manaus, where there are more streams, inundated lands, and clearings, according to visual evaluation of the collectors, there were few individuals but more species. Trails with streams and clearings are more species-rich than those crossing only plateaus and slopes. The most diverse areas, where trails cross plateaus/slopes, bottomlands/streams, and clearings, are in the southern part of the grid, and are probably the most heterogeneous environmentally, which may explain this result.

Social wasps are highly territorial insects, with populations showing considerable species concentration in the same location, and the clustered aggregation pattern predominates (Richards 1971). Taking these factors into account, it is possible that conducting an inventory in a limited area, even if reasonably large, like the PPBio grid, yield a subset of the local fauna only. On the other hand, the systematic sampling of an area imposed by a regular grid layout may minimize these shortcomings, and a more concentrated effort could offset the effect of the decreased total area to be explored.

The number of colonies found (18) is well below than the 74 colonies found at Caxiuanã, Pará (Silva & Silveira 2009). The lower richness and abundance of colonies in denser forest may be related to the difficulty of detecting them in these environments and also in the upper forest stratum, where they are very cryptic (Wenzel & Carpenter 1994; Tanaka-Jr. & Noll 2011). Another factor is that all samples were collected in the dry season (August to October), and this may not be the preferred nesting period of social wasps, considering this low number. Despite the difficulties of collecting in Amazonian environments due to canopy height, the higher richness found at the Ducke Reserve when compared to other biomes can be explained by the higher structural complexity of these environments, composed by dense forest, clearings, bottomlands, streams, slopes and plateaus, that allows the establishment and survival of more species of social wasps, providing microhabitats for the organisms, greater protection from predators, and increased availability and diversity of food resources and nesting substrates (Lawton 1983; Santos et al. 2007). Vegetation exerts direct influence on social wasp communities, providing support for nesting and food resources, indirectly affecting those communities by variations in temperature, humidity, and amount of shade in the environment (Wenzel 1991; Diniz & Kitayama 1994; Dejean et al. 1998).

The grid installed at the Ducke Reserve provided, for the first time, a structured inventory of the social wasps of a biological reserve in Central Amazonia at a significant sampling scale. The results show that the Ducke Reserve harbors a forest that maintains a medium to high species richness of social wasps, similar to other "terra firme" areas in Amazonia.

 

ACKNOWLEDGMENTS

We sincerely thank Fernando B. Noll, Elisabeth Franklin and Jorge P. Souza for their valuable suggestions on the manuscript; Marcos Torres, Valdeana Linard, Lucas Marques de Camargos, Vítor Dias Tarli and Paulo da Silva Lopes for help in the field; to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado do Amazonas (FAPEAM) and Biodiversity Research Program (PPBio) for support, to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) for the scholarship to the first autor; and Pedro Santos for help with the English version.

 

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Received 8 August 2014
Accepted 6 October 2014
Associate Editor: Marcel G. Hermes

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