Is it possible to simplify environmental monitoring? Approaches with zooplankton in a hydroelectric reservoir

Ana Caroline Alcântara Missias, Leonardo Fernandes Gomes, Hasley Rodrigo Pereira, Leo Caetano Fernandes da Silva, Ronaldo Angelini, Ludgero Cardoso Galli Vieira

Resumo


Aim: In order to contribute to the knowledge about the simplification of biological surveys, this study evaluated the use of substitute groups, numeric and taxonomic resolution for the three main groups of zooplankton (cladocerans, copepods and rotifers) in a Hydropower Plant (UHE). The following issues were addressed: (i) the patterns of spatial and/or temporal ordering generated between each zooplankton group are in concordance? (ii) The concordance is maintained using presence and absence data in place of abundance data? (iii) The identification of organisms to the species level can be replaced by genus or family?

Methods: Samples were taken in seven sample units over five campaigns between 2009 and 2010 in the UHE Serra da Mesa (Goiás, Brazil). To evaluate the correlation between each pair of matrices was used the Mantel test.

Results: The results demonstrate that the replacements should not be made among the zooplanktonic groups, requiring the monitoring of three groups (copepods, cladocerans and rotifers). Furthermore, the results suggest the use of density data of individuals rather than just presence/absence of species. Finally, the results of this study indicate the possibility of data at the level of species being replaced by data at the level of genus or family.

Conclusion: For monitoring purposes of zooplankton community, only the use of taxonomic resolution showed to be efficient for this area of study, not being recommended the use of substitutes nor numerical resolution of groups.


Palavras-chave


Biomonitoring, Concordance, Numerical Resolution, Taxonomic Resolution.



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