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Importance of local and landscape variables on multiple facets of stream fish biodiversity in a Neotropical agroecosystem

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Autor(es):
Roa-Fuentes, Camilo A. ; Heino, Jani ; Zeni, Jaquelini O. ; Ferraz, Silvio ; Cianciaruso, Marcus V. ; Casatti, Lilian
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: Hydrobiologia; v. 849, n. 20, p. 18-pg., 2020-09-08.
Resumo

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 alpha-diversity of stream fish assemblages, we sampled 85 streams in the Upper Parana 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 alpha-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). (AU)

Processo FAPESP: 12/05983-0 - Diversidade taxonômica e funcional da ictiofauna de riachos em diferentes agrossistemas no Estado de São Paulo
Beneficiário:Lilian Casatti
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 18/06033-1 - O papel dos fatores atuais e históricos nos padrões de diversidade beta de peixes em riachos de agroecossistemas
Beneficiário:Jaquelini de Oliveira Zeni
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado