The role of riverine forests for food supply for the omnivorous fish Brycon opalinus Cuvier, 1819 (Characidae) in the Serra do Mar, Southeast Brazil

Brazilian Journal of Biology

Lm. Gomiero²  Ag. Manzatto¹  Fms. Braga² 

[1] ,Universidade Estadual Paulista Instituto de Biociências Departamento de ZoologiaRio Claro SP ,Brasil

关键词: Atlantic rainforest;    Brycon opalinus;    frugivores;    omnivorism;    seed dispersal;    Mata Atlântica;    Brycon opalinus;    frugívoros;    onivoria;    dispersão de sementes;   

DOI  :  10.1590/S1519-69842008000200013

来源: SciELO

【 摘 要 】

The purpose of this study was to characterize the diet of the fish Brycon opalinus (Characidae) seasonally and locally, allowing for the determination of its food items and trophic relations with the aquatic and terrestrial environments. The study area encompasses three rivers (Paraibuna, Ipiranga and Grande) in the basin of the Paraibuna, southeast Brazil. Twelve monthly collections were made from January to December 2004. The degree of stomachic repletion and of accumulated visceral fat was analyzed, as was the intestinal length in each class of total length. The frequency of occurrence and the degree of food preference (DFP) of the food items of Brycon opalinus were determined by separating the vegetal and animal items, autochthonous and allochthonous, by insect order and vegetal family consumed. The frequency of occurrence of items of animal origin was found to be equivalent to that of vegetal origin, thus characterizing the omnivorism of Brycon opalinus feeding.

【 授权许可】

CC BY   
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