Differences in the feeding of Rhamdia quelen (Siluriformes, Heptapteridae) in four distinct lotic systems

Brazilian Journal of Biology

Ga Villares Junior¹  R Goitein¹ 

关键词: Sorocaba river basin;    alochthonous items;    autochthonous items;    opportunist fish;    Atlantic. Rain Forest;    rio Sorocaba;    itens alóctones;    itens autóctones;    oportunista;    Mata Atlântica;   

DOI  :  10.1590/1519-6984.20313

来源: SciELO

【 摘 要 】

AbstractThe aim of this study was to compare the food composition of Rhamdia quelen in four distinct order rivers. It was performed at a low part at the basin of the Sorocaba river in systems classified as first (Anastácio stream), second (Nego stream), fifth (Tatuí river) and sixth (Sorocaba river) orders. Collections were performed every month between January and December of 2011. The stomach contents were examined by using the alimentary index (IAi) and compared by the non-parametric method non-metric multidimensional scale ranking (NMDS) with the Spearman rank correlation. A diet difference was observed for individuals of the smaller systems (Anastácio and Nego streams) and the larger ones (Tatui and Sorocaba rivers), represented respectively by allochthonous and autochthonous organisms compounding their diets. Marginal vegetation and its interaction with the water conditions may respond to these composition differences.

【 授权许可】

CC BY   
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