Ecologia trófica de Astyanax intermedius Eigenmann, 1908 na sub-bacia do rio Preto, bacia do rio São Mateus-ES
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2012-02-16
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Coswosck, Michelle de Alcântara
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Universidade Federal do Espírito Santo
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The objective of this study was to investigate the food habit of the species Astyanax cf. intermedius, on aim of improving the understanding of their ecological interactions in the context of rio Preto’s ecosystem. The samples were performed using seine haul on systematized way, monthly, during the period of April 2010 to April 2011. Were caught 1218 fishes, which are distributed in 2 orders, 4 families, 5 genera and 7 species, where the Astyanax cf. intermedius, with 1102 specimens, was the predominant species. Was analyzed the contents of 390 stomachs, obtained from 30 randomly selected fishes at each month. The diet was qualitatively and quantitatively analyzed by methods of points and frequency of occurrence, and weighted by a feed index (IA). For a better understanding of the significance of the items present in the diet of the species studied were carried out analyses of diversity (H), evenness (e) and similarity. The calculations of feed diversity and evenness showed that Astyanax cf. intermedius feeds on a great diversity of food resources (28 items) throughout the year. One similarity analysis of diet was held by grouping analysis and its result did not demonstrate seasonality on study area. The autochtonous resources from animal origin composed the most of diet, with a predominance of aquatic insects.
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COSWOSCK, Michelle de Alcântara. Ecologia trófica de Astyanax intermedius Eigenmann, 1908 na sub-bacia do rio Preto, bacia do rio São Mateus-ES. 2012. 73 f. Dissertação (Mestrado em Biodiversidade Tropical) - Universidade Federal do Espírito Santo, Centro Universitário Norte do Espírito Santo, São Mateus, 2012.