Rhithronic and potamonic fishes coexist in wadeable streams under distinct metacommunity processes

Autor(es)

Ferreira, Fabio C. ^[1] ; Souza, Ursulla P. ^[2] ; Cetra, Mauricio ^[3] ; Petrere, Miguel ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo UNIFESP, Dept Ciencias Mar DCMAR, Santos - Brazil

^[2] Univ Santa Cecilia UNISANTA, Programa Posgrad Sustentabilidade Ecossistemas Co, Santos - Brazil

^[3] Univ Fed Sao Carlos UFSCar, DCA, Sorocaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGY OF FRESHWATER FISH; v. 28, n. 1, p. 85-96, JAN 2019.
• Citações Web of Science: 0

Resumo

Recent metacommunity ecology research has demonstrated that local communities can be divided into different guilds. We hypothesised that wadeable streams are occupied by fishes that follow distinct metacommunity processes. The mainstem is a river corridor for the potamonic fish guild (PFG) but represents a nonhabitat matrix for the rhithronic fish guild (RFG). Accordingly, the PFG should be filtered out from the headwaters by dispersal limitations or environmental filtering along the longitudinal gradient, and the guild should have a nested pattern of beta diversity. The RFG should be structured by the local species sorting, and the species turnover component should prevail. We sampled fishes in 42 streams distributed in four subbasins that were separated by at least one mainstem channel. We modelled the influences of spatial and environmental predictors using a partial redundancy analysis and variance partitioning and by quantifying the components of beta diversity that were associated with species turnover and nestedness. Both environment and space affected the structure of the RFG, owing to the influence of substrate type, riparian cover and presence of downstream barriers. The PFG was structured by only the influence of downstream barriers. Species turnover predominated within the RFG, and species nestedness dominated within the PFG. Our results support the hypothesis that potamonic and rhithronic guilds coexist in wadeable streams and follow distinct metacommunity assembly mechanisms. Potamonic guilds are structured by regional dispersal from the mainstem channels, whereas rhithronic guilds are sorted by local filtering along the longitudinal gradient in a spatially structured environment. (AU)

• Processo FAPESP: 12/51511-2 - Estrutura e dinâmica de comunidades em rios e riachos costeiros da Mata Atlântica, Bacia do Rio Itanhaém (PelD)
• Beneficiário: Antonio Fernando Monteiro Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular