Data/hora: 16/06/2024 15:33:06

Provedor de dados: | 83
País: | Brazil
Título: | Spatio-temporal segregation and size distribution of fish assemblages as related to non-native species occurrence in the middle rio Doce Valley, MG, Brazil
Autores: | Giacomini,Henrique Corrêa; Lima Jr.,Dilermando Pereira; Latini,Anderson Oliveira; Espírito-Santo,Helder Mateus Viana.
Data: | 2011-03-01
Ano: | 2011
Palavras-chave: | Species invasions; Beta diversity; Metacommunity; Body size; Predation.
Resumo: | The lakes in the middle rio Doce Valley (MG) are suffering impacts due to the introduction of invasive fish species, mainly piscivorous species like red piranha Pygocentrus nattereri and peacock bass Cichla kelberi. Fishes were collected in bimonthly samples conducted at ten lakes along a year. The present study showed that the composition of native fish assemblages is significantly related to the presence and type of non-native species. Fish species distribution among lakes can be explained by differences in species body size: smaller native species are less concentrated in lakes with invasive piscivores, which is in accordance with the hypothesis that they have greater susceptibility to predation by invaders. Another probable cause for this correlation is the proximity of lakes to the drainage system, which could explain both the non-native incidence and the turnover of native species composition. Furthermore, temporal variability in species composition was significantly higher in invaded lakes. This last factor may be linked to seasonal flood pulses, which carry immigrant fishes from streams in the vicinity. The metacommunity framework can bring insights for future studies in such spatially structured systems, and the approach should improve our understanding of processes underlying species composition as well as help direct conservation-focused management plans.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100012
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252011005000011
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.9 n.1 2011
Fonte: | info:eu-repo/semantics/openAccess