Abstract

PETRACCI, Pablo F. et al. Diet of the Kelp Gull (Larus dominicanus) during the breeding season in the Bahía Blanca estuary, Buenos Aires, Argentina. Hornero [online]. 2004, vol.19, n.1, pp.23-28. ISSN 0073-3407.

The Kelp Gull (Larus dominicanus) is widely distributed in Argentina. Several authors suggest that the species is expanding its geographic distribution due to its capacity to exploit food resources derived from human activities. This study shows the diet composition of the Kelp Gull during breeding season in a colony of 3114 nests located in the Del Puerto Island, Bahía Blanca estuary, Buenos Aires Province, Argentina. A total of 1024 pellets, five chick regurgitates, and 12 fledgling regurgitates collected between October and December 2003 were analyzed. A total of 39 prey categories were recorded, being grains (mainly sunflower) and cattle carrion the most important items (54.6% and 29.0%, respectively). These prey items are available in large quantities in the proximity of the colony, which could favour the population increase observed in the last years. Fishes, marine snails, insects, barnacles, garbage, chitons, mussels, clams, and rodents were also observed. Gulls from this colony, as in other colonies along the Patagonian coast, are generalists with a strong tendency to the exploitation of human-derived resources and, to a lesser degree, of seashore preys.

Keywords : Argentina; Bahía Blanca estuary; Breeding season; Diet; Kelp Gull; Larus dominicanus.

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