科研之友
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摘要
In this paper we present an analysis of the fifty S. fluviatilis feeding habits in the Amazonian Estuary. Animals were bycaught by the artisanal fishing fleet between 1996 and 2001. Feeding habits were analyzed by prey occurrence frequency (%F) and number percentage and stomachs contents preys similarity between marine and freshwater fishspecies present in the Amazonian Estuary. Thirteen fish species were identified (%F= 86.6), the most significant families were Sciaenidae (32%), Trichiuridae (26%) e Ariidae (16%), and four crustaceans species (%F=26). S. fluviatilis feeding habits did not differ bygender and in general, calves had higher prey diversity than juveniles and adults. The similarity was high (0.89) between estuarine S. fluviatilis feeding habits and the fishes speciespresent in the Amazonian Estuary when the environment is mostly marine. Objetivou-se descrever e analisar os h芍bitos alimentares de 50 golfinhos Sotalia fluviatilis capturados acidentalmente na frota pesqueira artesanal do Estu芍rio Amaz nico entre 1996 e 2001. As presas foram identificadas e calculadas a freq邦那ncia de ocorr那ncia e num谷rica; testada a similaridade entre a diversidade de presas dos conte迆dos e a diversidade de peixes marinhos e de 芍gua doce do estu芍rio e, comparados os h芍bitos alimentares por sexo e categoria de maturidade. Ocorreram 13 esp谷cies de peixes (86,6%) onde as fam赤liasSciaenidae (32%), Trichiuridae (26%) e Ariidae (16%) foram mais representativas e, quatro esp谷cies de crust芍ceos (26%). A esp谷cie n o apresentou diferen as nos h芍bitos alimentares entre sexos, mas, os filhotes tiveram maior diversidade de presas que jovens e adultos.Finalmente, houve maior similaridade (0.89) entre a diversidade de presas de S. fluviatilis e as esp谷cies de peixes quando o estu芍rio apresenta caracter赤sticas marinhas.
