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Effects of deforestation on environmental heterogeneity and its role in the distribution of fish species and functional groups in Amazonian streams

  • STREAM ECOLOGY
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Abstract

The advance of deforestation impacts freshwater ecosystems and, consequently, the environmental heterogeneity and associated biodiversity. Our objective was to examine the effect of deforestation on environmental heterogeneity (EH), species richness (SR), and functional richness (FRic) and the role of EH in the abundance of species and functional groups of stream fish. We analyzed 71 streams of the Acará-Capim basin, eastern Amazon. We used path analysis to assess whether land-use types influence the predominant vegetation cover and channel characteristics, and their indirect effect on EH, SR, and FRic. Taxa indicator threshold analysis was used to assess whether fish species and functional groups act as bioindicators of EH and percentage of forest in total catchment (PFTC). The higher percentage of secondary forest in total catchment (PSFTC) favored herbaceous understory plants and SR. The largest amount of sediments and higher PSFTC negatively influenced EH. FRic was not influenced by any of the variables. Species with high swimming ability that belong to the trophic guilds piscivores and invertivores, are associated with high values of EH and PFTC. Our results may be useful for riparian forest restoration projects, as we show which variables increase or decrease EH and demonstrate how bioindicators respond to this.

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Data availability

The datasets generated and analyzed during the current study are available in the supplementary material. Additional information may be acquired from the corresponding author upon reasonable request.

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Acknowledgements

Financial and logistical support was provided by Conservation International of Brazil (CI-Brazil), Agropalma Group, Biopalma/Vale, CIKEL Ltda., 33 Forest Capital, and the National Council for Scientific and Technological Development (CNPq), through projects Nº 449314 / 2014-2 (CNPq) and 128/2014 (FAPESPA/CNPq). We thank CNPq for the PhD grants to LGC (process 169410/2018-8) and productivity grants to LFAM (process 302406/2019-0). We also thank the Coordination for the Improvement of Higher Education Personnel (CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the PROCAD/CAPES funding (project No. 88881.068425/2014-01).

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All authors contributed to the study conception and design. Material acquisition and data collection were performed by Luciano Fogaça de Assis Montag. Analysis were performed by Lorrane Gabrielle Cantanhêde. The first draft of the manuscript was written by Lorrane Gabrielle Cantanhêde, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Lorrane Gabrielle Cantanhêde.

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Guest editors: Luiz Ubiratan Hepp, Frank Onderi Masese & Franco Teixeira de Mello / Stream Ecology and Environmental Gradients

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Supplementary file1 (DOCX 216 kb)

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Cantanhêde, L.G., de Assis Montag, L.F. Effects of deforestation on environmental heterogeneity and its role in the distribution of fish species and functional groups in Amazonian streams. Hydrobiologia 851, 327–341 (2024). https://doi.org/10.1007/s10750-023-05201-x

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  • DOI: https://doi.org/10.1007/s10750-023-05201-x

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