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Environmental Biology of Fishes

, Volume 71, Issue 4, pp 313–320 | Cite as

Effect of size on the energy acquired in species of the fish from a neotropical reservoir, Brazil

  • Evanilde Benedito cecilio
  • Alexandre Leandro pereira
  • Cássia Mônica sakuragui
Article

Abstract

In this paper we analysed autotrophic sources of the carbon (δ13C) and the trophic position (δ15N) of Leporinus friderici in the influence area of Corumbá Reservoir, Brazil. We collected samples of muscles of fish from different sizes riparian vegetation, C4 grasses, zooplankton, periphyton and particulate organic carbon (POC). There were significant differences for the carbon isotope proportion found in muscles of L.␣friderici in the different size groups analysed. The highest values of δ13C recorded for middle sized individuals is attributed to the large contribution of C4 plants in their diet. Small individuals sampled upstream also receive similar contribution from C4 plants. In contrast the same size group sampled downstream from the reservoir, has a much smaller of C4 plants. The δ13C negative character of small individuals from downstream is due to the larger contribution of C3 plants (except periphyton). At larger sizes we found intermediate δ13C values. The δ15N proportions we found for each size group were not significantly different, however we found decreasing mean values with increasing size. The trophic level calculated from the dietary data was higher than that found with the δ13C concentration in the muscle, except for small individuals, when the values were equal.

stable isotope Leporinus friderici ontogeny 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Evanilde Benedito cecilio
    • 1
  • Alexandre Leandro pereira
    • 2
  • Cássia Mônica sakuragui
    • 3
  1. 1.Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura, Curso de Pós-graduação em Ecologia de Ambientes de Água Doce, Departamento de BiologiaUniversidade Estadual de Maringá, Av. ColomboMaringá, PRBrazil
  2. 2.Curso de Pós-graduação em Ecologia de Ambientes de Água DoceUniversidade Estadual de Maringá, Av. ColomboMaringá, PRBrazil
  3. 3.Departamento de BiologiaUniversidade Estadual de Maringá, Av. ColomboMaringá, PRBrazil

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