Importance of local and landscape variables on multiple facets of stream fish biodiversity in a Neotropical agroecosystem
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2022
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Few studies have considered the effects of environmental variables at different spatial scales on Neotropical stream biodiversity. Furthermore, scale-related studies mostly include only one facet of biodiversity. To determine the contribution of local and landscape variables to the variation in the taxonomic, functional and phylogenetic α-diversity of stream fish assemblages, we sampled 85 streams in the Upper Paraná River basin, Brazil. Local variables explained a substantial fraction of the variance in almost all biodiversity facets. Landscape variables (i.e., land-use and spatial variables) contributed little to the variation in the α-component of biodiversity. Our results thus highlight the importance of local features for maintaining stream fish biodiversity in agroecosystems. Probably, land-use were not significant because the study area was in a relatively homogeneous landscape severely impacted by anthropogenic activities. It is possible that insignificant effects of spatial structuring occurred because the ichthyofauna has already gone through a homogenization process and/or due to the spatial scale of our study. We suggest that even though local-scale restoration actions would influence biodiversity, we should not neglect landscape restoration because substantial improvements in the ecological integrity of streams are more likely to be accomplished with large-scale actions (e.g., re-establishment of the native riparian forest).
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Functional diversity, Stream restoration, Phylogenetic diversity, Taxonomic diversity, Sugarcane, Pasture, Phylogenetic diversity
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ROA-FUENTES, Camilo A. et al. Importance of local and landscape variables on multiple facets of stream fish biodiversity in a Neotropical agroecosystem. Hydrobiologia, Berlin, v. 849, p. 4447-4464, 2022. DOI: 10.1007/s10750-020-04396-7. Disponível em: https://link.springer.com/article/10.1007/s10750-020-04396-7. Acesso em: 14 jul. 2023.