Stream fish metacommunity organisation across a Neotropical ecoregion: The role of environment, anthropogenic impact and dispersal-based processes

Autor(es)

Borges, Pedro Paulino ^[1] ; Dias, Murilo Sversut ^[2] ; Carvalho, Fernando Rogerio ^[3] ; Casatti, Lilian ^[4] ; Pompeu, Paulo Santos ^[5] ; Cetra, Mauricio ^[6] ; Tejerina-Garro, Francisco Leonardo ^{[7, 8]} ; Suarez, Yzel Rondon ^[9] ; Nabout, Joao Carlos ^[1] ; Teresa, Fabricio Barreto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Goias, Lab Biogeog & Ecol Aquat Bioecol, Anapolis, Go - Brazil

^[2] Univ Brasilia, Dept Ecol, Brasilia, DF - Brazil

^[3] Univ Fed Mato Grosso do Sul, Lab Ictiol, Setor Zool, Inst Biociencias, Campo Grande, MS - Brazil

^[4] UNESP, Dept Zool & Bot, Sao Jose Do Rio Preto, SP - Brazil

^[5] Univ Fed Lavras, Lab Ecol & Conservacao Peixes, Lavras, MG - Brazil

^[6] Univ Fed Sao Carlos, Dept Ciencias Ambientais DCA, Sao Paulo - Brazil

^[7] Pontificia Univ Catolica Goias, Ctr Biol Aquat, Goiania, Go - Brazil

^[8] UniEVANGELICA, Lab Biodiversidade PPSTMA, Anapolis, Go - Brazil

^[9] Univ Estadual Mato Grosso Sul, Ctr Integrado Anal & Monitoramento Ambiental CInA, Campo Grande, MS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 15, n. 5 MAY 26 2020.
• Citações Web of Science: 0

Resumo

Understanding how assemblages are structured in space and the factors promoting their distributions is one of the main goals in Ecology, however, studies regarding the distribution of organisms at larger scales remain biased towards terrestrial groups. We attempt to understand if the structure of stream fish metacommunities across a Neotropical ecoregion (Upper Parana-drainage area of 820,000 km(2)) are affected by environmental variables, describing natural environmental gradient, anthropogenic impacts and spatial predictors. For this, we obtained 586 sampling points of fish assemblages in the ecoregion and data on environmental and spatial predictors that potentially affect fish assemblages. We calculated the local beta diversity (Local Contribution to Beta Diversity, LCBD) and alpha diversity from the species list, to be used as response variables in the partial regression models, while the anthropogenic impacts, environmental gradient and spatial factors were used as predictors. We found a high total beta diversity for the ecoregion (0.41) where the greatest values for each site sampled were located at the edges of the ecoregion, while richer communities were found more centrally. All sets of predictors explained the LCBD and alpha diversity, but the most important was dispersal variables, followed by the natural environmental gradient and anthropogenic impact. However, we found an increase in the models' prediction power through the shared effect. Results suggest that environmental filters (i.e. environmental variables such as climate, hydrology and anthropogenic impact) and dispersal limitation together shape fish assemblages of the Upper Paranaecoregion, showing the importance of using multiple sets of predictors to understand the processes structuring biodiversity distribution. (AU)

• Processo FAPESP: 01/13340-7 - Avaliação da integridade biótica dos riachos da região Noroeste do estado de São Paulo, bacia do Alto Paraná, utilizando comunidades de peixes
• Beneficiário: Lilian Casatti
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Jovens Pesquisadores