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Current environmental conditions are weak predictors of fish community structure compared to community structure of the previous year

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Abstract

Predicting fish community structure in streams is a challenge considering the strong dynamics of these environments. In this study, we tested whether using a fish dataset obtained in a previous time was relevant to predict fish community structure in a subsequent time. We also tested whether temporal beta diversity of fish communities was correlated with environmental variability, stream size and order. To test these hypotheses, we collected data on fish communities, environmental and spatial variables from 15 streams in the Rio das Mortes Basin (Mato Grosso State, Brazil) in two consecutive drought periods (in 2016 and 2017). The gradients in fish richness and abundance were correlated between years. The results of a variation partitioning analysis indicated that the fish community structure in 2016 was the main explanatory matrix of the fish community structure in 2017 (when compared to environmental and spatial variables). A variation partitioning analysis, based only on environmental and spatial variables, showed a much higher residual variation. We did not detect significant relationships between fish temporal beta diversity and our explanatory variables. Our results indicate that our predictive power may be substantially increased by using data on past communities as explanatory variables. This is a viable analytical strategy because long-term studies are becoming more frequent. Temporal autocorrelation analyses of community data can also be useful to evaluate priority effects. In addition, these analyses can help plan biomonitoring programs. The second part of the results indicates, however, that our ability to predict temporal beta diversity is still limited.

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Acknowledgements

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) granted a scholarship to F. J. M. O. We thank the Fundação de Amparo à Pesquisa do Estado de Mato Grosso (FAPEMAT) for the financial support (227925/2015). DPLJ and LMB are supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (448823/2014-4 and 304314/2014-5, respectively). This paper was developed in the context of National Institutes for Science and Technology (INCT) in Ecology, Evolution, and Biodiversity Conservation supported by MCTIC/CNPq (465610/2014‐5) and FAPEG (201810267000023).

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FJMO and LMB designed the study. FJMO and DPLJr conducted the field work. FJMO and LMB analyzed the data. FJMO and LMB drafted the manuscript, with assistance from DPLJr.

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Correspondence to Fagner Junior M. Oliveira.

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Oliveira, F.J.M., Lima-Junior, D.P. & Bini, L.M. Current environmental conditions are weak predictors of fish community structure compared to community structure of the previous year. Aquat Ecol 54, 729–740 (2020). https://doi.org/10.1007/s10452-020-09771-z

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  • DOI: https://doi.org/10.1007/s10452-020-09771-z

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