Diet of Astyanax species (Teleostei, Characidae) in an Atlantic Forest River in Southern Brazil

Brazilian Archives of Biology and Technology

Fábio Silveira Vilella¹  Fernando Gertum Becker¹  Sandra Maria Hartz¹ 

[1] ,Universidade Federal do Rio Grande do Sul Departamento e Centro de Ecologia Laboratório de Ecologia de VertebradosPorto Alegre RS ,Brasil

关键词: Diet;    seed dispersal;    fish;    Astyanax;    Atlantic Forest;    Brazil;   

DOI  :  10.1590/S1516-89132002000200015

来源: SciELO

【 摘 要 】

Feeding habits of six species of Astyanax from river Maquiné are described. Fishes were sampled bi-monthly from November/95 to September/96 in two zones of the river. Items were identified, counted and had their abundance estimated according to a semi-quantitative scale. Frequency of occurrence, alimentary importance index (IFI) values and a similarity analysis of diets for each species-river zone sample were examined. All the species were considered typically omnivorous, with insects and vegetal matter being the most important items in their diet. These species could act as seed dispersers, particularly for macrophytes. Intra-specific spatial differences were not observed in comparisons of samples from two diferent regions of the river, except for A. fasciatus. The presence of Podostemaceae macrophytes in the mid-course of the river seemed to be important both as an autochthonous food resource and as habitat for several organisms preyed by the Astyanax species.

【 授权许可】

CC BY-NC   
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