As famílias Characidae e Loricariidae foram as mais ricas em espécies, seguidas por Cichlidae, no poço, e por Parodontidae, na corredeira. Characiformes, Siluriformes e Perciformes apresentaram o maior número de espécies nos dois meso-hábitats. Trinta e três espécies, de nove famílias e três ordens, foram capturadas nos dois meso-hábitats: 31 no poço e 18 na corredeira. Esse é um ribeirão de quinta ordem, afluente direto do rio Tietê no sistema do Alto rio Paraná. Key-words: seasonality, spatial distribution, upper rio Paraná system, niche breadth, diversity, adventitious streams.Ī estrutura das comunidades de peixes de um poço e uma corredeira do ribeirão Santa Bárbara é descrita. The seasonal variation for both assemblages was high, with the pool having a high turnover of species that could be due to the proximity with main channel of the rio Tietê. The greatest diversity and evenness occurred in the pool. Most species were accidental, 17 in the pool, and 10 in the rapid, and only six were constant in the two mesohabitats. The families Characidae and Loricariidae were the most specious, followed by Cichlidae in the pool, and by Parodontidae in the rapid. Orders Characiformes, Siluriformes, and Perciformes presented the greatest number of species in the two mesohabitats. Thirty three species, from nine families and three orders, were referred in the two mesohabitats: the pool with 31 species, and the rapid with 18. This stream of 5 th order is a direct tributary of the rio Tietê in the system of the upper rio Paraná. e-mail: structure of the fish communities of a pool and a rapid in the ribeirão Santa Bárbara is described. IUNESP, Universidade Estadual Paulista, Departamento de Zoologia e Botânica, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil. Riffle and pool fish communities in a large stream of southeastern Brazilįrancisco Langeani I Lilian Casatti I Helena Seixas Gameiro I André Bellucco do Carmo II Denise de Cerqueira Rossa-Feres I Seasonality spatial distribution upper rio Paraná system niche breadth diversity adventitious streams
This stream of 5th order is a direct tributary of the rio Tietê in the system of the upper rio Paraná. The structure of the fish communities of a pool and a rapid in the ribeirão Santa Bárbara is described.
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