Variability in the trophic position of larval fishes in theupper Paraná floodplain based on δ15N

Anais da Academia Brasileira de Ciências

Gislaine I Manetta²  Andréa Bialetzki¹  Luiz A Martinelli¹  Evanilde Benedito¹ 

[1] ,Universidade Estadual de Maringá Curso de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais Maringá PR ,Brasil

关键词: fish;    larval development;    trophic position;    δ15N;    peixe;    desenvolvimento larval;    posição trófica;    δ15N;   

DOI  :  10.1590/S0001-37652011000200016

来源: SciELO

【 摘 要 】

The upper Paraná River floodplain is composed of several marginal lagoons, making it a natural breeding ground for many fish species at developmental stages. The aim of this study is to estimate the trophic positions of these fishes based on feed intake (measured via diet) and nitrogen assimilation (measured via δ15N). The monthly samplings were concentrated during the spawning season in the Ivinheima River, which is located in the upper Paraná River floodplain. The specimens were grouped into preflexion, flexion and postflexion stages. Trophic positions were estimated based on the isotope value of nitrogen and on diet. During the developmental stages of P. squamosissimus, there were significant differences in the isotope values of δ15N; for H. edentatus, however, no significant differences were found. During the developmental stages, both species were classified as either at or above the third trophic level. Once this information is obtained for other species and components of the ecosystem, it will not only provide a more precise view of the energy allocation and flow in the ecosystem, but will also make possible for management measures to promote sustainability in this environment.

【 授权许可】

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