Habitat use by two species of Hypostomus (Pisces, Loricariidae) in southeastern brazilian streams
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Data
2005-01-01
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Instituto Virtual da Biodiversidade (BIOTA/FAPESP)
Resumo
Neste estudo investigamos o uso do hábitat dos cascudos Hypostomus ancistroides e Hypostomus sp. em 21 riachos localizados em uma paisagem dominada por pastagens no sistema do Alto Rio Paraná no Estado de São Paulo, Brasil. A abundância de Hypostomus sp. foi positivamente correlacionada com a extensão de corredeiras e condição da vegetação ripária enquanto que a abundância de H. ancistroides foi negativamente correlacionada com a condição da vegetação ripária. Treze atributos ecomorfológicos, processados em uma análise de componentes principais, mostraram que quando comparada com H. ancistroides, Hypostomus sp. possui abertura bucal mais ampla e corpo mais achatado, sugerindo uma forma de corpo adaptada a ambientes correntosos. Populações mais abundantes de Hypostomus sp. estiveram predominantemente associadas a riachos com boa disponibilidade de corredeiras e boa qualidade ripária, sugerindo que atributos populacionais dessa espécie possam ser posteriormente incorporados à avaliação da integridade biótica dos riachos de nossa região.
In this study, habitat use of the armored catfishes Hypostomus ancistroides and Hypostomus sp. was investigated in 21 streams from the Upper Rio Paraná system in São Paulo State, Brazil, a pasture dominated region. The abundance of Hypostomus sp. was positively correlated with the amount of riffles and riparian vegetation condition, whereas H. ancistroides abundance was negatively correlated with riparian vegetation condition. Thirteen ecomorphological attributes analyzed by principal component analysis showed that when compared to H. ancistroides, Hypostomus sp. presented a wider mouth and more flattened body, suggesting an adapted body to faster waters. The most abundant populations of Hypostomus sp. were predominantly associated with good riffle availability and good riparian quality, suggesting that populational features of this species may be incorporated in the stream biotic integrity assessment in that region.
In this study, habitat use of the armored catfishes Hypostomus ancistroides and Hypostomus sp. was investigated in 21 streams from the Upper Rio Paraná system in São Paulo State, Brazil, a pasture dominated region. The abundance of Hypostomus sp. was positively correlated with the amount of riffles and riparian vegetation condition, whereas H. ancistroides abundance was negatively correlated with riparian vegetation condition. Thirteen ecomorphological attributes analyzed by principal component analysis showed that when compared to H. ancistroides, Hypostomus sp. presented a wider mouth and more flattened body, suggesting an adapted body to faster waters. The most abundant populations of Hypostomus sp. were predominantly associated with good riffle availability and good riparian quality, suggesting that populational features of this species may be incorporated in the stream biotic integrity assessment in that region.
Descrição
Palavras-chave
armored catfishes, Upper rio Paraná, ecomorphology, Diet, habitat partitioning, cascudos, Alto Rio Paraná, Ecomorfologia, dieta, partilha de hábitat
Como citar
Biota Neotropica. Instituto Virtual da Biodiversidade | BIOTA - FAPESP, v. 5, n. 2, p. 157-165, 2005.