Sobreposição alimentar e partição de recursos alimentares entre espécies de peixes de um estuário tropical no Nordeste do Brasil
Resumo
Foram estudadas a sobreposição alimentar e a partilha de recursos entre nove espécies de peixes carnívoros capturados em águas rasas do estuário do rio Paraíba do Norte, Paraíba, Brasil. Os peixes foram amostrados com rede de arrasto de praia, entre janeiro e dezembro de 2008. Ao todo, foram analisados 958 estômagos. Crustacea foi o recurso alimentar dominante para Lutjanus alexandrei, L. jocu e Bathygobius soporator, enquanto Telostei foram consumidos principalmente por Centropomus undecimalis e C. parallelus. Em contraste, Polychaeta foram predados principalmente por Diapterus rhombeus, Eucinostomus argenteus, Sciades herzbergii e S. parkeri. Embora a maioria das espécies faça uso de itens alimentares semelhantes, elas o fazem em diferentes proporções e quantidades. No geral, a sobreposição de nicho entre as espécies foi baixa (< 0,60), mas houve casos em que duas espécies tiveram nicho alimentar altamente sobreposto (entre 0,72 e 0,97). Estes resultados corroboram a hipótese de que a partilha de recursos alimentares determina a coexistência de espécies em ambientes tropicais estuarinos.
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