Feeding Ecology of Leporinus friderici (Teleostei; Anostomidae) in the Upper Tocantins River, Central Brazil, before and after Installation of a Hydroelectric Plant

The feeding ecology of Leporinus friderici Bloch, 1794 was investigated in the upper Tocantins River, before and after its impoundment by the Serra da Mesa Hydroelectric Dam. Leporinus friderici was classified as an euryphagic, omnivorous species. Allochtonous food items formed a high proportion of...

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Published inStudies on neotropical fauna and environment Vol. 38; no. 1; pp. 33 - 40
Main Authors Albrecht, Míriam Pilz, Caramaschi, Érica Pellegrini
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.04.2003
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Summary:The feeding ecology of Leporinus friderici Bloch, 1794 was investigated in the upper Tocantins River, before and after its impoundment by the Serra da Mesa Hydroelectric Dam. Leporinus friderici was classified as an euryphagic, omnivorous species. Allochtonous food items formed a high proportion of its diet in all periods analysed, except in the later stages of reservoir formation. Its diet did not vary significantly between high-water and low-water seasons in the riverine environment, although it differed qualitatively. Leporinus friderici was very opportunistic, rapidly changing its diet to profit from the abundant terrestrial food sources when the reservoir started to flood the surrounding land, and shifting again when terrestrial food items became exhausted. Resumo A ecologia alimentar de Leporinus friderici Bloch, 1794 foi investigada no alto rio Tocantins antes e após seu represamento pelo AHE Serra da Mesa. A espécie foi classificada como onívora e eurifágica. Um consumo maior de itens alóctones foi observado em todos os períodos analisados, exceto em estágios posteriores de formação do reservatório. A dieta não variou significativamente entre as estações de águas altas e águas baixas no ambiente de rio, embora a composição qualitativa tenha sido diferente. Leporinus friderici demonstrou um comportamento claramente oportunista, mudando sua dieta rapidamente para aproveitar a abundância de itens de origem terrestre quando o reservatório começou a inundar as margens, e depois alterando novamente conforme esses itens foram se tornando escassos.
Bibliography:ObjectType-Article-2
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ISSN:0165-0521
1744-5140
DOI:10.1076/snfe.38.1.33.14033