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Bührnheim,Cristina Motta. |
Assemblage structure is related to predictable patterns of species composition, richness, and abundance. Stream habitat heterogeneity can be approached by two markedly hydrological sorts, riffles and pools, mainly featured by current, depth and substrate. Riffle and pool effect was studied on fish assemblages of three headwater terra firme rainforest streams in Urubu River basin. Central Amazonia, by 30-minute diurnal bank-side observational sampling intervals in which specimens were identified and counted. Twenty four habitats were chosen, eigth by stream, four riffles and four pools, for sampling in four trimestral periods in 1996 and 1997. The observations resulted in 754 specimens of 19 species. The most abundant species were: Pyrrhulina brevis... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonia fish assemblage structure riffles and pools species richness composition; And abundance bank-side observational sampling. |
Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300026 |
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Fernandes,Suzanne; Leitão,Rafael Pereira; Dary,Eurizângela Pereira; Guerreiro,Ana Isabel Camacho; Zuanon,Jansen; Bührnheim,Cristina Motta. |
Abstract This study assessed the diet of two poorly known syntopic fish species of the family Crenuchidae, Characidium aff. declivirostre and Leptocharacidium omospilus, in a Presidente Figueiredo´ rocky stream, Amazonas, Brazil. The stomach contents were analyzed and their Frequency of Occurrence (FO %) and Relative Volume (Vol %) were combined in a Feeding Index (IAi). We examined 20 individuals of C. aff. declivirostre and 23 of L. omospilus. The Morisita-Horn Index was used to estimate the overlap between the diets of these species. Immature insects were the most valuable items consumed by both fish species. The diet of C. aff. declivirostre was mainly composed of larvae and pupae of Chironomidae, while L. omospilus predominantly consumed larvae of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stream fish; Co-existence; Feeding overlap. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000100206 |
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