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Volume 42 - Number 3 - 2007

Diet of Munida gregaria (Fabricius, 1793) (Crustacea: Anomura: Galatheidae) in fishing beds of the San Jorge Gulf, Argentina

Martín Varisco1 y Julio H. Vinuesa2


1 Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco. Campus Universitario. Ruta 1 Km 4 (9000) Comodoro Rivadavia, Chubut, Argentina
2 Centro de Desarrollo Costero. Facultad de Humanidades y Ciencias Sociales, U.N.P.S.J.B y CONICET. Campus Universitario. Ruta 1 Km 4 (9000) Comodoro Rivadavia, Chubut, Argentina




The area encompassing San Jorge gulf and surroundings is one of the most important fishing grounds in Argentina. Heavy fishing pressure affects the dynamics of natural communities. The discards of low commercial value species may have an impact on benthic-demersal communities by increasing the amount of organics in the seafloor. This accumulation initially favours generalist species, which are capable of ingesting the available organic matter; such is the case of the lobster krill Munida gregaria. Thisstudy evaluates if the lobster krill benefits from discards of the different fisheries in the gulf and how the species adjusts to local conditions caused by the fishing activity. In order to achieve these goals, five bottom samples were taken from the central region and five from the north of the San Jorge gulf. The dietary composition of 30 specimens from each sample was determined, and statistical analyses were performed to test for differences among sampling sites. The results recognized significant differences among sampling sites in the diet of the lobster krill, the larger consumption of decapod crustaceans in the northern section of the gulf was attributed to its larger abundance in the bycatch composition

Key words: Feeding strategy, lobster krill, fishery, bycatch, discard




1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
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