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Understanding the effects of environmental heterogeneity on the morphofunctional structure of the phytoplankton community during the hydrological year in an Amazon floodplain lake, Brazil

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Abstract

The Amazon floodplains are complex systems influenced by the annual hydrological regime with an effect on the structuring of physical, chemical and biological processes. Thus, we evaluated the relationship of environmental factors with the composition and variation of functional groups based on morphology (MBFG) during the hydrological year in an Amazonian floodplain lake, with monthly sampling (2013 to 2014). We used analysis of variance (ANOVA) and Kruskal–Wallis to show differences in physicochemical variables between hydroperiods. We performed permutation analysis of variance (PERMANOVA) to assess the dissimilarity of morphofunctional groups between hydroperiods and also of environmental data between the months of the study and RDA redundancy analysis to assess the relationship between MBFGs and environmental data. It was registered 101 taxa distributed in eight taxonomic categories and was grouped into 5 MBFGs (III, IV, V, VI and VII), with Chlorophyceae (31 taxa) and Cyanobacteria (27 taxas) with the higher number of taxa. Furthermore, there was a dominance of Cyanobacteria in the total biovolume, which form blooms (MBFGs III and VII) during the periods of falling and low water in lake, influenced mainly by the reduction in the availability of light and an increase in temperature. In another scenario, the dominance of MBFGs V and VI occurred during periods of rising and high water with association with carbon compounds, rainfall, SRP and NO2. Thus, our results demonstrate that the availability of light, the concentration of nutrients and temperature were the most important variables for the morphofunctional structuring of phytoplankton in aquatic system.

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Acknowledgements

This study was sponsored by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) (fellowship to D.A.S), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil) grant number 1224656/2013-6, grant number 2019/15984-2, São Paulo Research Foundation (FAPESP) and CLIM-FABIAM program (Climate changes and Amazonian Floodplain Biodiversity), which was funded by FRB (Fondation Pour la Recherche sur la Biodiversité). We are grateful to Dra. Lúcia Helena Sampaio da Silva for assistance in the identification of phytoplankton and biovolume metrics.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DAdS, ALB, CK, DdMM, SdM, SC, KD-S, NRS and TB. The first draft of the manuscript was written by DAdS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Dilailson Araújo de Souza.

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This study was funded by CLIM-FABIAM program (Climate changes and Amazonian Floodplain Biodiversity), which was funded by FRB (Fondation pour la Recherche sur la Biodiversité).

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Handling Editor: Camilla Capelli.

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de Souza, D.A., Kraus, C.N., Burliga, A.L. et al. Understanding the effects of environmental heterogeneity on the morphofunctional structure of the phytoplankton community during the hydrological year in an Amazon floodplain lake, Brazil. Limnology 23, 275–286 (2022). https://doi.org/10.1007/s10201-021-00685-9

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  • DOI: https://doi.org/10.1007/s10201-021-00685-9

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