Abstract
Trait-based approaches are increasingly being used in aquatic ecology to elucidate how environmental conditions affect community assembly. However, studies of zooplankton from tropical regions are relatively rare. Our objective was to construct zooplankton trait-based functional groups (ZFG) to study tropical reservoirs that differ with respect to precipitation, eutrophication and hydrological operations. We selected and analysed zooplankton and associated environmental variables from four tropical reservoirs that were sampled during dry and rainy seasons for three years. Eight traits were evaluated to construct ZFGs using hierarchical clusters and classification trees. Six ZFGs were identified based on three non-redundant functional traits: habitat type, feeding and predatory escape response. Significant differences in the density and biomass of ZFGs were observed as indicated by regression models showing reservoir morphometry, hydrology, rainfall, and phytoplankton biomass as main environmental drivers. Our results highlight the usefulness of ZFG to monitoring programmes and for predicting zooplankton community changes in tropical reservoirs, allowing a greater understanding of plankton dynamics and ecosystems functioning.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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The authors wish to thank Light Energia S.A. for financial and logistic support (Research and Development Project coordinated by CWCB). We express our gratitude to Adriana Puga, Leonardo Coimbra and Izidro Ferreira de Sousa-Filho for field assistance in sample collections and analyses; Ángel Segura, Luciano Neves, Mariana Guedes and Reinaldo Bozelli for helping with concept and statistical analysis of this manuscript. Special thanks to Unirio and Udelar for the facilities provided for the execution of this research, as well as for the exchange of knowledge carried out by professors, researchers and students. We would like to thank Red de Macro Universidades de América Latina y el Caribe and Santander Universidades for the Master’s Academic Mobility Scholarship to EFO, and also to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the doctorate scholarship to EFO and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the Master scholarship to GK.
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Data used in this manuscript came from the Project of Research and Development Carbon, Nitrogen and Phosphorus Storage in Reservoirs supported by the Light Energia S.A. Company and coordinated by CWCB.
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All authors contributed significantly towards the conception of this manuscript. EFO, CWCB, CK and GL: conceptualization was done. EFO, GK, CK and GL: data curation and investigation were carried out. EFO, GK, CK and GL: formal analysis was carried out. EFO, CK and GL: writing—original draft were done. CK, GL, CWCB and GK: writing—review and editing were done.
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Fintelman-Oliveira, E., Kruk, C., Lacerot, G. et al. Zooplankton functional groups in tropical reservoirs: discriminating traits and environmental drivers. Hydrobiologia 850, 365–384 (2023). https://doi.org/10.1007/s10750-022-05074-6
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DOI: https://doi.org/10.1007/s10750-022-05074-6