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Effects of local and regional factors on the fish assemblage structure in Meridional Amazonian streams |
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| Authors: | Izaias M Fernandes Luzia S Lourenço Rafaela P Ota Milena M M Moreira Cláudio H Zawadzki |
| Institution: | 1. Instituto Nacional de Pesquisas da Amaz?nia, Programa de Pós-Gradua??o em Biologia de água Doce e Pesca Interior, Caixa Postal 478, CEP 69083-970, Manaus, Amazonas, Brazil 2. Instituto de Biociências, Universidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Ecologia, Caixa Postal 199, CEP 13506-900, Rio Claro, S?o Paulo, Brazil 3. Universidade Estadual de Maringá, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Avenida Colombo 5790, CEP 87020-900, Maringá, Paraná, Brazil |
| Abstract: | The aim of this study was to evaluate the effects of local, regional and temporal factors structuring fish assemblages in Meridional Amazonian streams during the months of May (rainy season) and August (dry season) of 2008. To accomplish this task, 14 streams located in Serra do Expedito (Aripuanã River basin) were sampled along 30-m stretches. A total of 3,212 specimens distributed among five orders, 18 families, and 55 species were recorded. The fish assemblage structure in the streams presented variation among types of riparian vegetation (local factor) and watersheds (regional factor), but did not present variation between seasons (temporal factor) and stream order (regional factor). Larger streams with margins covered with pasture presented higher species richness and abundance than smaller streams with margins covered with forest. |
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