Food resources sustaining the fish fauna in a section of the upper São Francisco River in Três Marias, MG, Brazil

Brazilian Journal of Biology

M. C. C. Alvim²  A. C. Peret¹ 

[1] ,Universidade Federal de São Carlos Programa de Pós-graduação em Ecologia e Recursos Naturais São Carlos SP ,Brazil

关键词: trophic ecology of fishes;    feeding habits;    resources partitioning;    São Francisco River;    ecologia trófica de peixes;    hábitos alimentares;    partilha de recursos;    rio São Francisco;   

DOI  :  10.1590/S1519-69842004000200003

来源: SciELO

【 摘 要 】

With the purpose of determining the principal food resources responsible for maintaining the fishery yield in a section of the São Francisco River, 6 sampling of the fish fauna were made downstream from the Três Marias Dam, from September 1996 to July 1997. A total of 1,127 individuals of 35 species were captured, using gillnets with mesh sizes varying from 3 to 16 cm. The stomach contents of 33 species were examined in order to determine their diets. Five trophic guilds were established, in the following order of importance: ilyophagous, herbivorous, piscivorous, terrestrial invertebrates feeders, and aquatic invertebrates feeders. The resources sustaining the fish fauna were mainly of allochthonous origin. The ichthyonenosis appears to be mainly dependent on the detritus chain. The ciliary forest and seasonal flooding pulses are the main suppliers of food for the fish fauna.

【 授权许可】

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