Spatial variation in the stable isotopes of 13C and 15N and trophic position of Leporinus friderici (Characiformes, Anostomidae) in Corumbá Reservoir, Brazil

Anais da Academia Brasileira de Ciências

Alexandre L. Pereira²  Evanilde Benedito¹  Cássia M. Sakuragui¹ 

[1] ,Universidade Estadual de Maringá Departamento de Agronomia Maringá PR ,Brasil

关键词: stable isotopes;    reservoir;    Leporinus friderici;    food web;    isótopos estáveis;    reservatório;    Leporinusfriderici;    teia alimentar;   

DOI  :  10.1590/S0001-37652007000100006

来源: SciELO

【 摘 要 】

Stable isotopes of carbon (delta13C) and nitrogen (delta15N) were used to describe sources of energy and trophic position for adult Leporinus friderici in the area of the Corumbá Reservoir, Brazil. Samples were collected from April 1999 to March 2000. Spatial variations were not identified in the isotopic composition. The maximum and minimum contribution of C4 plants calculated integrating the variation of plants and fish were 47.7% and 2.4%, respectively. Among C3 plants, periphyton presented closer isotopic values to those observed for fishes, corresponding to an important carbon source. The proportion of ingested plant item is larger in rivers upstream from the reservoir (42.7%), which justifies the smaller trophic level among there. However, in the reservoir, the ingestion of fish was 81.4%, while ingested plants contributed with 18.6%. Downstream from the dam, participation of plant item was even smaller (14.4%). Although the trophic position calculated with diet data was proportional to the one calculated with delta15N values, the former elevated the trophic level of L. friderici in the food web, because estimated trophic positions were based on fish items belonging to the 2nd (a) and to the 3rd (b) trophic levels.

【 授权许可】

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