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Comparative analysis of ex situ zooplankton hatching methods

Análise comparativa de métodos de eclosão de zooplâncton ex situ

Abstract:

Aims

This study aims to analyze the efficiency of two novel methods for ex situ zooplankton hatching experiments, compared with a traditional one. Both proposed methods were specifically designed to minimize sediment resuspension during the sampling of hatched individuals when no previous egg isolation is performed.

Methods

Sediment samples were collected from shallow lakes, homogenized, and incubated for 18 days under stable laboratory conditions. The traditional method (1M) involved simple water filtration from incubated sediments. The so called “inverted funnel filtering” method (2M) includes an inverted funnel located above the sediment to trap zooplankton that passes through the funnel aperture, and the “levels filtering” method (3M) involves perforated plates above the sediment. The efficiency of each method was evaluated by analyzing the cumulative abundance and number of taxa in hatched total zooplankton, rotifers, and microcrustaceans, as well as the overall composition.

Results

The new proposed methods significantly favored higher abundances than 1M for total zooplankton and rotifers. Even more, 3M outperformed 2M in the case of microcrustacean hatching abundances.

Conclusions

Our findings suggest that despite all analyzed methods being suitable for studying zooplankton hatchings, the newly proposed methods incorporating internal structures to minimize sediment resuspension displayed increased capture efficiency.

Keywords:
methods; ex situ experiments; resistance eggs; passive zooplankton; sediment

Resumo:

Objetivo

Este estudo tem como objetivo analisar a eficiência de dois novos métodos para experimentos de eclosão de zooplâncton ex situ, comparados com um método tradicional. Ambos os métodos propostos foram especificamente projetados para minimizar a ressuspensão de sedimentos durante a amostragem de indivíduos eclodidos quando não há isolamento prévio dos ovos.

Métodos

Amostras de sedimentos foram coletadas de lagos rasos, homogeneizadas e incubadas por 18 dias em condições laboratoriais estáveis. O método tradicional (1M) envolveu uma simples filtração da água dos sedimentos incubados. O método chamado “filtragem por funil invertido” (2M) inclui um funil invertido localizado acima do sedimento para capturar zooplâncton que passasse pela abertura do funil, e o método “filtragem por níveis” (3M) envolveu placas perfuradas acima do sedimento. A eficiência de cada método foi avaliada analisando a abundância cumulativa e o número de táxons no zooplâncton total eclodido, rotíferos e microcrustáceos, bem como a composição geral.

Resultados

Os novos métodos propostos favoreceram significativamente uma maior abundância do que 1M para zooplâncton total e rotíferos. Além disso, 3M superou 2M no caso das capturas de eclosão de microcrustáceos. Conclusões: Nossos resultados sugerem que, apesar de todos os métodos analisados serem adequados para estudar eclosões de zooplâncton, os novos métodos propostos que incorporam estruturas internas para minimizar a ressuspensão de sedimentos apresentaram maior eficiência de captura.

Palavras-chave:
métodos; experimentos ex situ; ovos de resistência; zooplâncton passivo; sedimento

1. Introduction

Zooplankton “egg banks” have been a target of several studies aiming to explore past communities, assess temporal patterns, population dynamics and seasonal succession among many other processes within this community (Hairston et al., 2000Hairston Jr, N.G., Hansen, A.-M., & Schaffner, W.R., 2000. The effect of diapause emergence on the seasonal dynamics of a zooplankton assemblage. Freshw. Biol. 45(2), 133-145. http://doi.org/10.1046/j.1365-2427.2000.00386.x.
http://doi.org/10.1046/j.1365-2427.2000....
; Brendonck & De Meester, 2003Brendonck, L., & De Meester, L., 2003. Egg banks in freshwater zooplankton: evolutionary and ecological archives in the sediment. Hydrobiologia 491(1-3), 65-84. http://doi.org/10.1023/A:1024454905119.
http://doi.org/10.1023/A:1024454905119...
; Gyllström & Hansson, 2004Gyllström, M., & Hansson, L.-A., 2004. Dormancy in freshwater zooplankton: Induction, termination and the importance of benthic-pelagic coupling. Aquat. Sci. 66, 274-295. http://doi.org/10.1007/s00027-004-0712-y.
http://doi.org/10.1007/s00027-004-0712-y...
; Nevalainen et al., 2011Nevalainen, L., Luoto, T.P., Levine, S., & Manca, M., 2011. Paleolimnological evidence for increased sexual reproduction in chydorids (Chydoridae, Cladocera) under environmental stress. J. Limnol. 70(2), 255-262. http://doi.org/10.4081/jlimnol.2011.255.
http://doi.org/10.4081/jlimnol.2011.255...
; Vehmaa et al., 2018Vehmaa, A., Katajisto, T., & Candolin, U., 2018. Long-term changes in a zooplankton community revealed by the sediment archive. Limnol. Oceanogr. 63(5), 2126-2139. http://doi.org/10.1002/lno.10928.
http://doi.org/10.1002/lno.10928...
). In this regard, the study of passive zooplankton has been useful in diversity studies, paleolimnology, fundamental and applied ecology, climate change effects on aquatic systems, and other related field of research (Jeppesen et al., 2001Jeppesen, E., Leavitt, P., De Meester, L., & Jensen, J.P., 2001. Functional ecology and palaeolimnology: using cladoceran remains to reconstruct anthropogenic impact. Trends Ecol. Evol. 16(4), 191-198. PMid:11245942. http://doi.org/10.1016/S0169-5347(01)02100-0.
http://doi.org/10.1016/S0169-5347(01)021...
; Vandekerkhove et al., 2005Vandekerkhove, J., Declerck, S., Brendonck, L., Conde-Porcuna, J.M., Jeppesen, E., & De Meester, L., 2005. Hatching of cladoceran resting eggs: temperature and photoperiod. Freshw. Biol. 50(1), 96-104. http://doi.org/10.1111/j.1365-2427.2004.01312.x.
http://doi.org/10.1111/j.1365-2427.2004....
; Gaikwad et al., 2008Gaikwad, S.R., Ingle, K.N., & Thorat, S.R., 2008. Study of zooplankton emergence pattern and resting egg diversity of recently dried waterbodies in North Maharashtra Region. J. Environ. Biol. 29(3), 353-356. PMid:18972691.; Nielsen & Brock, 2009Nielsen, D.L., & Brock, M.A., 2009. Modified water regime and salinity as a consequence of climate change: prospects for wetlands of Southern Australia. Clim. Change 95(3-4), 523-533. http://doi.org/10.1007/s10584-009-9564-8.
http://doi.org/10.1007/s10584-009-9564-8...
). More recent investigations have analyzed the relationship of eggs banks with harsh environmental conditions such as pollution, and eutrophication as well as their implications in environmental restoration practices (Nevalainen et al., 2011Nevalainen, L., Luoto, T.P., Levine, S., & Manca, M., 2011. Paleolimnological evidence for increased sexual reproduction in chydorids (Chydoridae, Cladocera) under environmental stress. J. Limnol. 70(2), 255-262. http://doi.org/10.4081/jlimnol.2011.255.
http://doi.org/10.4081/jlimnol.2011.255...
; Piscia et al., 2016Piscia, R., Tabozzi, S., Bettinetti, R., Nevalainen, L., & Manca, M.M., 2016. Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta. J. Limnol. 75(2s), 76-85. http://doi.org/10.4081/jlimnol.2016.1300.
http://doi.org/10.4081/jlimnol.2016.1300...
; Gutierrez et al., 2017Gutierrez, M.F., Battauz, Y., & Caisso, B., 2017. Disruption of the hatching dynamics of zooplankton egg banks due to glyphosate application. Chemosphere 171, 644-653. PMid:28056451. http://doi.org/10.1016/j.chemosphere.2016.12.110.
http://doi.org/10.1016/j.chemosphere.201...
; Rogalski et al., 2017Rogalski, M.A., Leavitt, P.R., & Skelly, D.K., 2017. Daphniid zooplankton assemblage shifts in response to eutrophication and metal contamination during the Anthropocene. Proc. Biol. Sci. 284(1859), 20170865. PMid:28747475. http://doi.org/10.1098/rspb.2017.0865.
http://doi.org/10.1098/rspb.2017.0865...
; Portinho et al., 2018Portinho, J.L., Nielsen, D.L., Daré, L., Henry, R., Oliveira, C., & Branco, C.C.Z., 2018. Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments. Chemosphere 203, 151-159. PMid:29614408. http://doi.org/10.1016/j.chemosphere.2018.03.156.
http://doi.org/10.1016/j.chemosphere.201...
; Coelho et al., 2021Coelho, P.N., Paes, T.A.S.V., Maia-Barbosa, P.M., & dos Santos-Wisniewski, M.J., 2021. Effects of pollution on dormant-stage banks of cladocerans and rotifers in a large tropical reservoir. Environ. Sci. Pollut. Res. Int. 28(24), 30887-30897. PMid:33594550. http://doi.org/10.1007/s11356-021-12751-x.
http://doi.org/10.1007/s11356-021-12751-...
).

Although hatching ecology of passive zooplankton is a relatively old field of research, there are still many methodological gaps for the ex situ experiments involving hatching tests. More specifically, the selection of an appropriate hatching method for those experiments that use the whole sediment instead of resting eggs previously isolated is an important challenge. In this regard, there is no consensus on how to collect recently hatched zooplankton organisms avoiding alterations on the sediment structure (e.g., resuspension), water characteristics (e.g. turbidity), and sample quality (e.g. containing suspended particles or even non-hatched resting eggs).

Direct visualization and manual separation of newborns have been frequently reported, which is a useful technique for studying easily visible individuals such as microcrustaceans (Vandekerkhove et al., 2004Vandekerkhove, J., Niessen, B., Declerck, S., Jeppesen, E., Conde Porcuna, J.J., Brendonck, L., & De Meester, L., 2004. Hatching rate and hatching success with and without isolation of zooplankton resting stages. Hydrobiologia 526(1), 235-241. http://doi.org/10.1023/B:HYDR.0000041598.68424.fc.
http://doi.org/10.1023/B:HYDR.0000041598...
; Liefferink et al., 2014Liefferink, S.L., Tate, R.B., van Vuren, J.H.J., Ferreira, M., & Malherbe, W., 2014. A comparison of methods for incubating zooplankton diapausing eggs from sediment of endorheic pans in the Free State, South Africa. Afr. J. Aquat. Sci. 39(4), 417-423. http://doi.org/10.2989/16085914.2014.975778.
http://doi.org/10.2989/16085914.2014.975...
; Vargas et al., 2019Vargas, A.L., Santangelo, J.M., & Bozelli, R.L., 2019. Recovery from drought: viability and hatching patterns of hydrated and desiccated zooplankton resting eggs. Int. Rev. Hydrobiol. 104(1-2), 26-33. http://doi.org/10.1002/iroh.201801977.
http://doi.org/10.1002/iroh.201801977...
). However, this technique is inadequate for small individuals such as rotifers for which the filtering method seems to be the most convenient. This consists of removing and filtering the water from the incubation tray by using hoses, pipettes or even tilting the container to pour the water over the filter (Battauz et al., 2015Battauz, Y.S., de Paggi, S.B.J., & Paggi, J.C., 2015. Endozoochory by an ilyophagous fish in the Paraná River floodplain: a window for zooplankton dispersal. Hydrobiologia 755(1), 161-171. http://doi.org/10.1007/s10750-015-2230-4.
http://doi.org/10.1007/s10750-015-2230-4...
; Silva Bandeira et al., 2020Silva Bandeira, M.G., Martins, K.P., Palma-Silva, C., Hepp, L.U., & Albertoni, E.F., 2020. Hydration time influences microcrustacean hatching in intermittent wetlands: in situ and ex situ approaches. Hydrobiologia 847(15), 3227-3245. http://doi.org/10.1007/s10750-020-04315-w.
http://doi.org/10.1007/s10750-020-04315-...
; Souza Santos et al., 2021Souza Santos, G., Silva, E.E.C., Balmant, F.M., & Gomes, P.C.S., 2021. Impacts of exposure to mine tailings on zooplankton hatching from a resting egg bank. Aquat. Ecol. 55(2), 545-557. http://doi.org/10.1007/s10452-021-09844-7.
http://doi.org/10.1007/s10452-021-09844-...
; Brazil et al., 2022Brazil, T., Caetano, A.C.L., Vargas, A.L., Bozelli, R.L., & Santangelo, J.M., 2022. Desiccation increases the hatching of resting eggs of a freshwater calanoid copepod. J. Plankton Res. 44(2), 273-277. http://doi.org/10.1093/plankt/fbac008.
http://doi.org/10.1093/plankt/fbac008...
). Another similar technique consists of sweeping the water with a manual net directly inside the tray (Vendramin et al., 2023Vendramin, D., Pires, M.M., Medeiros, E.S.F., Stenert, C., & Maltchik, L., 2023. Life finds a way: hatching dynamics of zooplankton dormant stages in intermittent wetlands from the Brazilian tropical semiarid. J. Arid Environ. 212, 104949. http://doi.org/10.1016/j.jaridenv.2023.104949.
http://doi.org/10.1016/j.jaridenv.2023.1...
). Nonetheless, all these techniques have disadvantages already mentioned, primarily related to the sediment’s resuspension during the water collection phase or when returning the water after the filtering process. Another important problem that emerges is the possibility that some hatched organisms remain retained in the upper layer of the substrate during the water collection process. This failure may cause an underestimation of the number of hatchings and the possibility that such organisms be reproduced before the next sampling stage, causing subsequent overestimations.

To overcome these limitations, a recent alternative technique was used involving the inclusion of a series of perforated plates at different levels inside the incubation trays (Gutierrez et al., 2017Gutierrez, M.F., Battauz, Y., & Caisso, B., 2017. Disruption of the hatching dynamics of zooplankton egg banks due to glyphosate application. Chemosphere 171, 644-653. PMid:28056451. http://doi.org/10.1016/j.chemosphere.2016.12.110.
http://doi.org/10.1016/j.chemosphere.201...
). This method could be based on the assumption that hatching organisms ascend in the water column, but in any potential descent to the bottom do not reach the sediment. However, the efficiency of this technique has not been experimentally validated yet.

Based on methodologies previously used in other in situ and ex situ hatching experiments, we designed and tested two incubation methods that allow minimizing sediment resuspension during the hatched individuals sampling. Both methods were compared with a traditional one in terms of capture efficiency (measured as individual abundance and number of taxa) and composition differences.

2. Material and Methods

2.1. Methodological designs

The main characteristics of the capture methods of zooplankton hatching are visualized in Figure 1.

Figure 1
Characteristics of the containers used in three methods for capturing dormant states of zooplankton: 1M = free filtering technique; 2M = inverted funnel filtering technique; 3M = levels filtering technique.

The first method is the traditional “free filtering technique” (1M). This classic filtering technique consists of extracting and filtering the supernatant water from the containers through a small hose or pipette.

The second method is called “inverted funnel filtering” (2M) which is a modification of the frequently used in situ hatched method (Whiteside & Williams, 1975Whiteside, M.C., & Williams, J.B., 1975. A new sampling technique for aquatic ecologists. Verh. Int. Ver. Theor. Angew. Limnol. 19(2), 1534-1539. http://doi.org/10.1080/03680770.1974.11896216.
http://doi.org/10.1080/03680770.1974.118...
; Brakke, 1976Brakke, D.F., 1976. Modification of the Whiteside-Williams pattern sampler. J. Fish. Res. Board Can. 33(12), 2861-2863. http://doi.org/10.1139/f76-346.
http://doi.org/10.1139/f76-346...
). Inverted funnel traps have been widely used in in situ hatching studies, mainly for cladocerans and copepods (De Stasio, 1990De Stasio Jr, B.T., 1990. The role of dormancy and emergence patterns in the dynamics of a freshwater zooplankton community. Limnol. Oceanogr. 35(5), 1079-1090. http://doi.org/10.4319/lo.1990.35.5.1079.
http://doi.org/10.4319/lo.1990.35.5.1079...
; Compte et al., 2016Compte, J., Montenegro, M., Ruhí, A., Gascón, S., Sala, J., & Boix, D., 2016. Microhabitat selection and diel patterns of zooplankton in a Mediterranean temporary pond. Hydrobiologia 766(1), 201-213. http://doi.org/10.1007/s10750-015-2455-2.
http://doi.org/10.1007/s10750-015-2455-2...
) but also it has been successfully employed in laboratory experiments (Gutierrez et al., 2020Gutierrez, M.F., Molina, F.R., Frau, D., Mayora, G., & Battauz, Y., 2020. Interactive effects of fish predation and sublethal insecticide concentrations on freshwater zooplankton communities. Ecotoxicol. Environ. Saf. 196, 110497. PMid:32247956. http://doi.org/10.1016/j.ecoenv.2020.110497.
http://doi.org/10.1016/j.ecoenv.2020.110...
). This consists of using an inverted funnel above the sediment, which works as a trap for the hatching zooplankton that passes the funnel opening, becoming trapped in the upper level. For this, we used a plastic inverted funnel with an opening diameter of 2.2 cm which was put on 1.5 cm of sediment level.

The third capture method is called the “levels filtering” (3M) which is a modification of the filter method with perforated trays (Gutierrez et al., 2017Gutierrez, M.F., Battauz, Y., & Caisso, B., 2017. Disruption of the hatching dynamics of zooplankton egg banks due to glyphosate application. Chemosphere 171, 644-653. PMid:28056451. http://doi.org/10.1016/j.chemosphere.2016.12.110.
http://doi.org/10.1016/j.chemosphere.201...
). This technique consists of using perforated trays placed on different levels above the sediment. Similarly, to the second method, the trays work as a trap for the hatching zooplankton that passes the perforations. For this, we used two perforated trays and put them into 4 cm and 8 cm of sediment level. The lower level tray had 3 perforations of 1.5 cm in diameter while the upper one had 5 perforations of 0.8 cm in diameter.

In the three cases, we used clear plastic cups of similar characteristics and dimensions (volume of 1000 ml, height of 17 cm, upper diameter of 10.5 cm, and lower diameter of 7 cm). Our decision to use taller than wide containers was based on preliminary experiments that displayed higher hatchings in the former than in the latter.

2.2. Sediment sampling and treatments

Sediment samples from two neighboring shallow lakes were collected between May and July 2023. Both lakes were located in the ecological reservoir of the University Campus of “Universidad Nacional del Litoral” (Santa Fe, Argentina 31°37′ S, 60° 41′ W). The lakes belong to the alluvial plain of the Paraná River and receive inputs from groundwater and other water bodies close to the Paraná River mainstream during flood periods.

The samples were collected from the surface sediment (<10 cm deep) with an 8 cm diameter sediment corer. A total of 20 sediment samples were taken at different points of the littoral zone of both lakes. Subsequently, the sediment was dried on trays in an environment climatized laboratory (22 °C) for a week. After this time, the samples were mixed, homogenized, and stored in the dark at 4 °C for 3 weeks, to stimulate the hatching process of zooplankton (Vandekerkhove et al., 2005Vandekerkhove, J., Declerck, S., Brendonck, L., Conde-Porcuna, J.M., Jeppesen, E., & De Meester, L., 2005. Hatching of cladoceran resting eggs: temperature and photoperiod. Freshw. Biol. 50(1), 96-104. http://doi.org/10.1111/j.1365-2427.2004.01312.x.
http://doi.org/10.1111/j.1365-2427.2004....
).

2.3. Experimental setup and hatching collection

After the storage period, 30 g of homogenized sediment was distributed into 18 containers, which were randomly assigned to one of the three capture methods (i.e. 6 replicates per method). Then, 700 ml of 24-h aerated and dechlorinated tap water was added to each container. The sediment level inside each container reached 1.5 cm and the water level reached 13.5 cm. During the hatching assessment period, the containers were maintained in controlled conditions of temperature (25 °C) and photoperiod (16 h light: 8 h dark).

The hatchings of zooplankton resting stages in the sediment of all containers were monitored for 18 days. Samples of hatched organisms were collected from the containers by filtering the entire water content using a 60 μm plankton net. After filtration, the water was returned to the containers, and dechlorinated water was added to maintain the initial volume. Sampling occurred every two days during the first two weeks and every three days during the final week.

All the collected samples were fixed with 10% formalin. The samples were identified and counted under an optical microscope at the magnification of 20-400x, in 1 mL Kolkwitz chamber. For taxonomy identification, we used specific keys (Ringuelet, 1958Ringuelet, R.A., 1958. Los Crustáceos Copépodos de las aguas continentales de la República Argentina: contribuciones científicas. Buenos Aires: Facultad de Ciencias Exactas y Naturales, UBA.; Reid, 1985Reid, J.W., 1985. Chave de identificação e lista de referências bibliográficas para as espécies continentais sulamericanas de vida livre da ordem Cyclopoida (Crustacea, Copepoda). Boll. Zool. 9(9), 17-143. http://doi.org/10.11606/issn.2526-3358.bolzoo.1985.122293.
http://doi.org/10.11606/issn.2526-3358.b...
; Voigt & Koste, 1978Voigt, M., & Koste, W., 1978. Rotatoria: die Radetiere Mitteleuropas. Ein Bestimmungswerk, begrundet von Max Voigt. Berlin: Borntraeger, 1149 p.; Paggi, 1979Paggi, J.C., 1979. Revisión de las especies argentinas del género Bosmina Baird agrupadas en el subgénero Neobosmina Lieder (Crustacea: cladocera). Acta Zool. Lilloana 35(1), 137-162.; Smirnov, 1992Smirnov, N.N., 1992. The Macrothricidae of the world. Amsterdam: SPB Academic Publishing.).

2.4. Data analyses

To compare the efficiency of the capture methods, we calculated the cumulative abundance and number of taxa. The cumulative data were used to constrain the daily variation in zooplankton hatching. We employed generalized linear models (GLM) to assess three capture methods' influence on the cumulative abundance and number of taxa. Error distributions and link functions were chosen for each variable based on the base of outlined by Buckley (2015)Buckley, Y.M., 2015. Generalized linear models. In: Fox, G.A., Negrete-Yankelevich, S., & Sosa, V.J., eds. Ecological statistics: contemporary theory and application. Oxford: Oxford University Press, 131-148, 1 ed. http://doi.org/10.1093/acprof:oso/9780199672547.003.0007.
http://doi.org/10.1093/acprof:oso/978019...
. The binomial negative distribution and logarithm link function were best adjusted to cumulative abundance, and the Poisson distribution and logarithm link function to cumulative numbers of taxa. Consequently, Likelihood Ratio Tests (LRT) were conducted to determine the significance of the models and Bonferroni post hoc tests by contrast among capture methods. All analyses were made in R software (version 4.0.2).

We analyzed the community structure to analyze the temporal dynamics among the capture methods. The community structure of captured zooplankton was analyzed through Monte Carlo permutation tests in constrained ordination, calculated by Principal Response Curves (PRC) analyses using prc {vegan} in R. PRC is a multivariate analysis grounded in redundancy analysis (RDA), which is adjusted to account for overall changes in community response over time. This analytical approach allows for both graphical and quantitative interpretations of effects at the species level over time (Van Den Brink & ter Braak, 1999Van Den Brink, P.J., & ter Braak, C.J.F., 1999. Principal response curves: analysis of time‐dependent multivariate responses of biological community to stress. Environ. Toxicol. Chem. 18(2), 138-148. http://doi.org/10.1002/etc.5620180207.
http://doi.org/10.1002/etc.5620180207...
). PRC employed diagrams to illustrate treatment deviations over time relative to a control treatment (1M) and species weights about the pattern in the PRC. Permutation tests are carried out by sampling date using treatment levels as explanatory variables to determine treatment significance, with p < 0.05 denoting significance. PRC has been employed in many studies involving Treatments with Repeated Observations in zooplankton (Van Den Brink et al., 2000Van Den Brink, P.J., Hattink, J., Bransen, F., Van Donk, E., Brock, T.C.M., & Van Den Brink, P.J., 2000. Impact of the fungicide carbendazim in freshwater microcosms. II. Zooplankton, primary producers and final conclusions. Aquat. Toxicol. 48(2-3), 251-264. PMid:10686330. http://doi.org/10.1016/S0166-445X(99)00037-5.
http://doi.org/10.1016/S0166-445X(99)000...
; Hanson et al., 2007Hanson, M.L., Graham, D.W., Babin, E., Azam, D., Coutellec, M.-A., Knapp, C.W., Lagadic, L., & Caquet, T., 2007. Influence of isolation on the recovery of pond mesocosms from the application of an insecticide. I. Study design and planktonic community responses. Environ. Toxicol. Chem. 26(6), 1265-1279. PMid:17571694. http://doi.org/10.1897/06-248R.1.
http://doi.org/10.1897/06-248R.1...
; López-Mancisidor et al., 2008López-Mancisidor, P., Carbonell, G., Marina, A., Fernández, C., & Tarazona, J.V., 2008. Zooplankton community responses to chlorpyrifos in mesocosms under Mediterranean conditions. Ecotoxicol. Environ. Saf. 71(1), 16-25. PMid:17629945. http://doi.org/10.1016/j.ecoenv.2007.06.006.
http://doi.org/10.1016/j.ecoenv.2007.06....
; Moreira et al., 2021Moreira, R.A., dos Santos Silva, E., Sanches, A.L.M., Freitas, E.C., Vieira, B.H., Reghini, M.V., Mello Batista, H., Silva Pinto, T.J., Santos Wisniewski, M.J., Espindola, E.L.G., Rocha, O., & Daam, M.A., 2021. Impact of simulated pesticide spray drift and runoff events on the structural and functional zooplankton diversity in tropical freshwater microcosms. Water Air Soil Pollut. 232(8), 1-15. http://doi.org/10.1007/s11270-021-05265-2.
http://doi.org/10.1007/s11270-021-05265-...
).

The physicochemical parameters were assessed using the Wilks test of Multivariate Analysis of Variance (MANOVA) using manova {stats} in R. MANOVA is an extension of ANOVA tailored for two or more continuous response variables. It combines these variables linearly to optimize the separation of groups defined by the independent variable. MANOVA is applied by researchers in water quality assessment (Basu & Lokesh, 2014Basu, S., & Lokesh, K.S., 2014. Application of multiple linear regression and Manova to evaluate health impacts due to changing river water quality. Appl. Math. 5(5), 799-807. http://doi.org/10.4236/am.2014.55076.
http://doi.org/10.4236/am.2014.55076...
; Medeiros et al., 2013Medeiros, A.M.A., Eustáquio de Sousa, C., Crispim, M.C., Karla, A., & Montenegro, A., 2013. Effects of experimental eutrophization on zooplankton community. Acta Limnol. Bras. 25(2), 183-191. http://doi.org/10.1590/S2179-975X2013000200009.
http://doi.org/10.1590/S2179-975X2013000...
).

3. Results

A total of 30 taxa of hatched zooplankton were identified throughout the experiment (Table 1). Rotifers exhibited the highest taxa number, (n=22), followed by microcrustaceans, of which 7 taxa and one larval stage were observed, enclosing 6 cladoceran species and a single copepod.

Table 1
List of zooplankton taxa in capture methods.

There was a significant difference in the abundance among the three methods (LTR tests: p < 0.05); however, no variations were observed in the number of taxa (LTR tests: p > 0.05, Figure 2). 2M and 3M resulted in significantly higher abundances compared to 1M, both in the total and rotifers counts. In microcrustacean counts, 3M exhibited a greater abundance compared to 2M. Conversely, the number of taxa remained consistent across all three methods, inclusive of total, rotifers and microcrustaceans counts.

Figure 2
Abundance and number of taxa in the total zooplankton, rotifer, and microcrustaceans groups. 1M = free filtering technique; 2M = inverted funnel filtering technique; 3M = levels filtering technique. Asterisks (*) show the models that significatively differ from the null one and letters a, b, and ab indicate homologous groups among capture methods based on Bonferroni post hoc test.

The composition of hatched zooplankton was unaffected by the capture methods (Monte Carlo test, p = 0.25). The PRC showed a similar zooplankton taxonomy composition among the three capture methods (Figure 3).

Figure 3
Principal Response Curves of the zooplankton composition among the three capture methods. 1M = free filtering technique; 2M = inverted funnel filtering technique; 3M = levels filtering technique.

Physicochemical parameters of water were comparable across the three capture methods (MANOVA: Wilks (8:94) = 0.828; p = 0.328). However, they varied significantly concerning sample days (MANOVA: Wilks (4:47) = 0.0507; p < 0.001). Temperature, pH, and dissolved oxygen increased over time, while conductivity decreased (Table 2).

Table 2
Mean and standard deviation (SD) values of water physicochemical parameters.

4. Discussion

Our data demonstrate that the capture methods 2M and 3M with barriers that create two or three internal levels, respectively, in the water column could be more efficient to collect hatched individuals than the traditional ones in terms of organism abundance. Both methods significantly improved the number of rotifers, while 3M significantly improved the number of both, rotifers and microcrustaceans. However, the number of taxa and taxonomic composition were similar among the three evaluated methods.

The differences observed among the three methods could be mainly associated with the effects of sediment resuspension during water filtration and then returning. On the one hand, sediment disturbances have the potential to alter the vertical distribution of eggs and modify sediment thickness (Marcus & Taulbee, 1992Marcus, N.H., & Taulbee, K., 1992. Potential effects of a resuspension event on the vertical distribution of copepod eggs in the sea bed: a laboratory simulation. Mar. Biol. 114(2), 249-251. http://doi.org/10.1007/BF00349526.
http://doi.org/10.1007/BF00349526...
; Radzikowski et al., 2016Radzikowski, J., Sikora, A., & Ślusarczyk, M., 2016. The effect of lake sediment on the hatching success of Daphnia ephippial eggs. J. Limnol. 75(3), 597-605. http://doi.org/10.4081/jlimnol.2016.1345.
http://doi.org/10.4081/jlimnol.2016.1345...
), consequently impacting the hatching success of the eggs. On the other hand, some individuals that prefer to hide near the bottom (Tavşanoğlu et al., 2012Tavşanoğlu, Ü.N., Idil Çakiroğlu, A., Erdoğan, Ş., Meerhoff, M., Jeppesen, E., & Beklioglu, M., 2012. Sediments, not plants, offer the preferred refuge for Daphnia against fish predation in Mediterranean shallow lakes: an experimental demonstration. Freshw. Biol. 57(4), 795-802. http://doi.org/10.1111/j.1365-2427.2012.02745.x.
http://doi.org/10.1111/j.1365-2427.2012....
) can be retained and trapped in sediment meanwhile the water media is being filtered. Therefore, the presence of barriers, creating internal compartments in the water column has the double role of diminishing sediment resuspension and increasing individual captures.

The difference observed in microcrustaceans between both proposed methods (i.e. lower capture rate in M2 compared to M3) may be attributed to their swimming behavior patterns. Some cladocerans typically swim by hopping and sinking (Dodson & Ramcharan, 1991Dodson, S., & Ramcharan, C., 1991. Size-specific swimming behavior of Daphnia pulex. J. Plankton Res. 13(6), 1367-1379. http://doi.org/10.1093/plankt/13.6.1367.
http://doi.org/10.1093/plankt/13.6.1367...
; O'Keefe et al., 1998O'Keefe, T., Brewer, M.C., & Dodson, S.I., 1998. Swimming behavior of Daphnia: its role in determining predation risk. J. Plankton Res. 20(5), 973-984. http://doi.org/10.1093/plankt/20.5.973.
http://doi.org/10.1093/plankt/20.5.973...
; Uttieri et al., 2014Uttieri, M., Sandulli, R., Spezie, G., & Zambianchi, E., 2014. From small to large scale: a review of the swimming behaviour of Daphnia. In: M. El-Doma, ed. Daphnia: biology and mathematics perspectives. New York: Nova Science Publishers, 309-322.), which could be a disadvantage to ascend to the upper level when colliding on the inclined surface of the cone at 2M.

The similarity in the number of taxa, and composition, among the capture methods suggests that all three methods are appropriate for studying zooplankton hatchings. However, each method may also present practical complications. For this reason, we provide a comparative table of practical conditions that can help using each capture method according objective of the study (Table 3). The structures of the inverted funnel and perforated trays, while effective in preventing sediment resuspension, also pose challenges for water filtration manipulation. Consequently, this necessitates greater caution in the filtration process.

Table 3
Practical characteristics of the ex situ zooplankton hatching methods.

Up to date, this study represents the first comparative analysis of ex situ capture methods for dormancy stages in zooplankton. We emphasize the need for further research on other methodological gaps in studies concerning dormancy stages in zooplankton, including issues such as sampling periodicity, light intensity, temperature, and other factors that trigger the hatching process.

Acknowledgements

We are grateful to Leonardo Henrique Pazin and Matheus Soares Costa for their assistance in translating the abstract into Portuguese. This research was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Ministerio de Producción, Ciencia y Tecnología (PEICID-2022-194 and SECTEI- Santa Fe PI: María Florencia Gutierrez).

  • Cite as: Flores-Mendez, D.N. and Gutierrez, M.F. Comparative analysis of ex situ zooplankton hatching methods. Acta Limnologica Brasiliensia, 2024, vol. 36, e23. https://doi.org/10.1590/S2179-975X11323

References

  • Basu, S., & Lokesh, K.S., 2014. Application of multiple linear regression and Manova to evaluate health impacts due to changing river water quality. Appl. Math. 5(5), 799-807. http://doi.org/10.4236/am.2014.55076
    » http://doi.org/10.4236/am.2014.55076
  • Battauz, Y.S., de Paggi, S.B.J., & Paggi, J.C., 2015. Endozoochory by an ilyophagous fish in the Paraná River floodplain: a window for zooplankton dispersal. Hydrobiologia 755(1), 161-171. http://doi.org/10.1007/s10750-015-2230-4
    » http://doi.org/10.1007/s10750-015-2230-4
  • Brakke, D.F., 1976. Modification of the Whiteside-Williams pattern sampler. J. Fish. Res. Board Can. 33(12), 2861-2863. http://doi.org/10.1139/f76-346
    » http://doi.org/10.1139/f76-346
  • Brazil, T., Caetano, A.C.L., Vargas, A.L., Bozelli, R.L., & Santangelo, J.M., 2022. Desiccation increases the hatching of resting eggs of a freshwater calanoid copepod. J. Plankton Res. 44(2), 273-277. http://doi.org/10.1093/plankt/fbac008
    » http://doi.org/10.1093/plankt/fbac008
  • Brendonck, L., & De Meester, L., 2003. Egg banks in freshwater zooplankton: evolutionary and ecological archives in the sediment. Hydrobiologia 491(1-3), 65-84. http://doi.org/10.1023/A:1024454905119
    » http://doi.org/10.1023/A:1024454905119
  • Buckley, Y.M., 2015. Generalized linear models. In: Fox, G.A., Negrete-Yankelevich, S., & Sosa, V.J., eds. Ecological statistics: contemporary theory and application. Oxford: Oxford University Press, 131-148, 1 ed. http://doi.org/10.1093/acprof:oso/9780199672547.003.0007
    » http://doi.org/10.1093/acprof:oso/9780199672547.003.0007
  • Coelho, P.N., Paes, T.A.S.V., Maia-Barbosa, P.M., & dos Santos-Wisniewski, M.J., 2021. Effects of pollution on dormant-stage banks of cladocerans and rotifers in a large tropical reservoir. Environ. Sci. Pollut. Res. Int. 28(24), 30887-30897. PMid:33594550. http://doi.org/10.1007/s11356-021-12751-x
    » http://doi.org/10.1007/s11356-021-12751-x
  • Compte, J., Montenegro, M., Ruhí, A., Gascón, S., Sala, J., & Boix, D., 2016. Microhabitat selection and diel patterns of zooplankton in a Mediterranean temporary pond. Hydrobiologia 766(1), 201-213. http://doi.org/10.1007/s10750-015-2455-2
    » http://doi.org/10.1007/s10750-015-2455-2
  • De Stasio Jr, B.T., 1990. The role of dormancy and emergence patterns in the dynamics of a freshwater zooplankton community. Limnol. Oceanogr. 35(5), 1079-1090. http://doi.org/10.4319/lo.1990.35.5.1079
    » http://doi.org/10.4319/lo.1990.35.5.1079
  • Dodson, S., & Ramcharan, C., 1991. Size-specific swimming behavior of Daphnia pulex. J. Plankton Res. 13(6), 1367-1379. http://doi.org/10.1093/plankt/13.6.1367
    » http://doi.org/10.1093/plankt/13.6.1367
  • Gaikwad, S.R., Ingle, K.N., & Thorat, S.R., 2008. Study of zooplankton emergence pattern and resting egg diversity of recently dried waterbodies in North Maharashtra Region. J. Environ. Biol. 29(3), 353-356. PMid:18972691.
  • Gutierrez, M.F., Battauz, Y., & Caisso, B., 2017. Disruption of the hatching dynamics of zooplankton egg banks due to glyphosate application. Chemosphere 171, 644-653. PMid:28056451. http://doi.org/10.1016/j.chemosphere.2016.12.110
    » http://doi.org/10.1016/j.chemosphere.2016.12.110
  • Gutierrez, M.F., Molina, F.R., Frau, D., Mayora, G., & Battauz, Y., 2020. Interactive effects of fish predation and sublethal insecticide concentrations on freshwater zooplankton communities. Ecotoxicol. Environ. Saf. 196, 110497. PMid:32247956. http://doi.org/10.1016/j.ecoenv.2020.110497
    » http://doi.org/10.1016/j.ecoenv.2020.110497
  • Gyllström, M., & Hansson, L.-A., 2004. Dormancy in freshwater zooplankton: Induction, termination and the importance of benthic-pelagic coupling. Aquat. Sci. 66, 274-295. http://doi.org/10.1007/s00027-004-0712-y
    » http://doi.org/10.1007/s00027-004-0712-y
  • Hairston Jr, N.G., Hansen, A.-M., & Schaffner, W.R., 2000. The effect of diapause emergence on the seasonal dynamics of a zooplankton assemblage. Freshw. Biol. 45(2), 133-145. http://doi.org/10.1046/j.1365-2427.2000.00386.x
    » http://doi.org/10.1046/j.1365-2427.2000.00386.x
  • Hanson, M.L., Graham, D.W., Babin, E., Azam, D., Coutellec, M.-A., Knapp, C.W., Lagadic, L., & Caquet, T., 2007. Influence of isolation on the recovery of pond mesocosms from the application of an insecticide. I. Study design and planktonic community responses. Environ. Toxicol. Chem. 26(6), 1265-1279. PMid:17571694. http://doi.org/10.1897/06-248R.1
    » http://doi.org/10.1897/06-248R.1
  • Jeppesen, E., Leavitt, P., De Meester, L., & Jensen, J.P., 2001. Functional ecology and palaeolimnology: using cladoceran remains to reconstruct anthropogenic impact. Trends Ecol. Evol. 16(4), 191-198. PMid:11245942. http://doi.org/10.1016/S0169-5347(01)02100-0
    » http://doi.org/10.1016/S0169-5347(01)02100-0
  • Liefferink, S.L., Tate, R.B., van Vuren, J.H.J., Ferreira, M., & Malherbe, W., 2014. A comparison of methods for incubating zooplankton diapausing eggs from sediment of endorheic pans in the Free State, South Africa. Afr. J. Aquat. Sci. 39(4), 417-423. http://doi.org/10.2989/16085914.2014.975778
    » http://doi.org/10.2989/16085914.2014.975778
  • López-Mancisidor, P., Carbonell, G., Marina, A., Fernández, C., & Tarazona, J.V., 2008. Zooplankton community responses to chlorpyrifos in mesocosms under Mediterranean conditions. Ecotoxicol. Environ. Saf. 71(1), 16-25. PMid:17629945. http://doi.org/10.1016/j.ecoenv.2007.06.006
    » http://doi.org/10.1016/j.ecoenv.2007.06.006
  • Marcus, N.H., & Taulbee, K., 1992. Potential effects of a resuspension event on the vertical distribution of copepod eggs in the sea bed: a laboratory simulation. Mar. Biol. 114(2), 249-251. http://doi.org/10.1007/BF00349526
    » http://doi.org/10.1007/BF00349526
  • Medeiros, A.M.A., Eustáquio de Sousa, C., Crispim, M.C., Karla, A., & Montenegro, A., 2013. Effects of experimental eutrophization on zooplankton community. Acta Limnol. Bras. 25(2), 183-191. http://doi.org/10.1590/S2179-975X2013000200009
    » http://doi.org/10.1590/S2179-975X2013000200009
  • Moreira, R.A., dos Santos Silva, E., Sanches, A.L.M., Freitas, E.C., Vieira, B.H., Reghini, M.V., Mello Batista, H., Silva Pinto, T.J., Santos Wisniewski, M.J., Espindola, E.L.G., Rocha, O., & Daam, M.A., 2021. Impact of simulated pesticide spray drift and runoff events on the structural and functional zooplankton diversity in tropical freshwater microcosms. Water Air Soil Pollut. 232(8), 1-15. http://doi.org/10.1007/s11270-021-05265-2
    » http://doi.org/10.1007/s11270-021-05265-2
  • Nevalainen, L., Luoto, T.P., Levine, S., & Manca, M., 2011. Paleolimnological evidence for increased sexual reproduction in chydorids (Chydoridae, Cladocera) under environmental stress. J. Limnol. 70(2), 255-262. http://doi.org/10.4081/jlimnol.2011.255
    » http://doi.org/10.4081/jlimnol.2011.255
  • Nielsen, D.L., & Brock, M.A., 2009. Modified water regime and salinity as a consequence of climate change: prospects for wetlands of Southern Australia. Clim. Change 95(3-4), 523-533. http://doi.org/10.1007/s10584-009-9564-8
    » http://doi.org/10.1007/s10584-009-9564-8
  • O'Keefe, T., Brewer, M.C., & Dodson, S.I., 1998. Swimming behavior of Daphnia: its role in determining predation risk. J. Plankton Res. 20(5), 973-984. http://doi.org/10.1093/plankt/20.5.973
    » http://doi.org/10.1093/plankt/20.5.973
  • Paggi, J.C., 1979. Revisión de las especies argentinas del género Bosmina Baird agrupadas en el subgénero Neobosmina Lieder (Crustacea: cladocera). Acta Zool. Lilloana 35(1), 137-162.
  • Piscia, R., Tabozzi, S., Bettinetti, R., Nevalainen, L., & Manca, M.M., 2016. Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta. J. Limnol. 75(2s), 76-85. http://doi.org/10.4081/jlimnol.2016.1300
    » http://doi.org/10.4081/jlimnol.2016.1300
  • Portinho, J.L., Nielsen, D.L., Daré, L., Henry, R., Oliveira, C., & Branco, C.C.Z., 2018. Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments. Chemosphere 203, 151-159. PMid:29614408. http://doi.org/10.1016/j.chemosphere.2018.03.156
    » http://doi.org/10.1016/j.chemosphere.2018.03.156
  • Radzikowski, J., Sikora, A., & Ślusarczyk, M., 2016. The effect of lake sediment on the hatching success of Daphnia ephippial eggs. J. Limnol. 75(3), 597-605. http://doi.org/10.4081/jlimnol.2016.1345
    » http://doi.org/10.4081/jlimnol.2016.1345
  • Reid, J.W., 1985. Chave de identificação e lista de referências bibliográficas para as espécies continentais sulamericanas de vida livre da ordem Cyclopoida (Crustacea, Copepoda). Boll. Zool. 9(9), 17-143. http://doi.org/10.11606/issn.2526-3358.bolzoo.1985.122293
    » http://doi.org/10.11606/issn.2526-3358.bolzoo.1985.122293
  • Ringuelet, R.A., 1958. Los Crustáceos Copépodos de las aguas continentales de la República Argentina: contribuciones científicas. Buenos Aires: Facultad de Ciencias Exactas y Naturales, UBA.
  • Rogalski, M.A., Leavitt, P.R., & Skelly, D.K., 2017. Daphniid zooplankton assemblage shifts in response to eutrophication and metal contamination during the Anthropocene. Proc. Biol. Sci. 284(1859), 20170865. PMid:28747475. http://doi.org/10.1098/rspb.2017.0865
    » http://doi.org/10.1098/rspb.2017.0865
  • Silva Bandeira, M.G., Martins, K.P., Palma-Silva, C., Hepp, L.U., & Albertoni, E.F., 2020. Hydration time influences microcrustacean hatching in intermittent wetlands: in situ and ex situ approaches. Hydrobiologia 847(15), 3227-3245. http://doi.org/10.1007/s10750-020-04315-w
    » http://doi.org/10.1007/s10750-020-04315-w
  • Smirnov, N.N., 1992. The Macrothricidae of the world. Amsterdam: SPB Academic Publishing.
  • Souza Santos, G., Silva, E.E.C., Balmant, F.M., & Gomes, P.C.S., 2021. Impacts of exposure to mine tailings on zooplankton hatching from a resting egg bank. Aquat. Ecol. 55(2), 545-557. http://doi.org/10.1007/s10452-021-09844-7
    » http://doi.org/10.1007/s10452-021-09844-7
  • Tavşanoğlu, Ü.N., Idil Çakiroğlu, A., Erdoğan, Ş., Meerhoff, M., Jeppesen, E., & Beklioglu, M., 2012. Sediments, not plants, offer the preferred refuge for Daphnia against fish predation in Mediterranean shallow lakes: an experimental demonstration. Freshw. Biol. 57(4), 795-802. http://doi.org/10.1111/j.1365-2427.2012.02745.x
    » http://doi.org/10.1111/j.1365-2427.2012.02745.x
  • Uttieri, M., Sandulli, R., Spezie, G., & Zambianchi, E., 2014. From small to large scale: a review of the swimming behaviour of Daphnia In: M. El-Doma, ed. Daphnia: biology and mathematics perspectives. New York: Nova Science Publishers, 309-322.
  • Van Den Brink, P.J., & ter Braak, C.J.F., 1999. Principal response curves: analysis of time‐dependent multivariate responses of biological community to stress. Environ. Toxicol. Chem. 18(2), 138-148. http://doi.org/10.1002/etc.5620180207
    » http://doi.org/10.1002/etc.5620180207
  • Van Den Brink, P.J., Hattink, J., Bransen, F., Van Donk, E., Brock, T.C.M., & Van Den Brink, P.J., 2000. Impact of the fungicide carbendazim in freshwater microcosms. II. Zooplankton, primary producers and final conclusions. Aquat. Toxicol. 48(2-3), 251-264. PMid:10686330. http://doi.org/10.1016/S0166-445X(99)00037-5
    » http://doi.org/10.1016/S0166-445X(99)00037-5
  • Vandekerkhove, J., Declerck, S., Brendonck, L., Conde-Porcuna, J.M., Jeppesen, E., & De Meester, L., 2005. Hatching of cladoceran resting eggs: temperature and photoperiod. Freshw. Biol. 50(1), 96-104. http://doi.org/10.1111/j.1365-2427.2004.01312.x
    » http://doi.org/10.1111/j.1365-2427.2004.01312.x
  • Vandekerkhove, J., Niessen, B., Declerck, S., Jeppesen, E., Conde Porcuna, J.J., Brendonck, L., & De Meester, L., 2004. Hatching rate and hatching success with and without isolation of zooplankton resting stages. Hydrobiologia 526(1), 235-241. http://doi.org/10.1023/B:HYDR.0000041598.68424.fc
    » http://doi.org/10.1023/B:HYDR.0000041598.68424.fc
  • Vargas, A.L., Santangelo, J.M., & Bozelli, R.L., 2019. Recovery from drought: viability and hatching patterns of hydrated and desiccated zooplankton resting eggs. Int. Rev. Hydrobiol. 104(1-2), 26-33. http://doi.org/10.1002/iroh.201801977
    » http://doi.org/10.1002/iroh.201801977
  • Vehmaa, A., Katajisto, T., & Candolin, U., 2018. Long-term changes in a zooplankton community revealed by the sediment archive. Limnol. Oceanogr. 63(5), 2126-2139. http://doi.org/10.1002/lno.10928
    » http://doi.org/10.1002/lno.10928
  • Vendramin, D., Pires, M.M., Medeiros, E.S.F., Stenert, C., & Maltchik, L., 2023. Life finds a way: hatching dynamics of zooplankton dormant stages in intermittent wetlands from the Brazilian tropical semiarid. J. Arid Environ. 212, 104949. http://doi.org/10.1016/j.jaridenv.2023.104949
    » http://doi.org/10.1016/j.jaridenv.2023.104949
  • Voigt, M., & Koste, W., 1978. Rotatoria: die Radetiere Mitteleuropas. Ein Bestimmungswerk, begrundet von Max Voigt. Berlin: Borntraeger, 1149 p.
  • Whiteside, M.C., & Williams, J.B., 1975. A new sampling technique for aquatic ecologists. Verh. Int. Ver. Theor. Angew. Limnol. 19(2), 1534-1539. http://doi.org/10.1080/03680770.1974.11896216
    » http://doi.org/10.1080/03680770.1974.11896216

Edited by

Associate Editor: André Megali Amado.

Publication Dates

  • Publication in this collection
    19 July 2024
  • Date of issue
    2024

History

  • Received
    26 Dec 2023
  • Accepted
    13 May 2024
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