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The diet of marine birds of Abrolhos national park, Bahia, Brasil Dieta das aves marinhas no Parque Nacional dos Abrolhos, Bahia, Brasil



The diet of marine birds of Abrolhos national park, Bahia, Brasil Dieta das aves marinhas no Parque Nacional dos Abrolhos, Bahia, Brasil



Ornithologia. Junho; 11: 75-92



Three expeditions were accomplished in the Abrolhos National Park, in the State of Bahia, in December 1998, June and July 1999. Their main objective was the analysis of the nesting seabirds species diet composition. Food resources use, verifying the frequence of occurrence and diversity of the ingested preys were our focus. Material come from hand captured Magnificent Frigatebird, Masked Bobby, Red-billed Tropicbird and Brown Noody for banding and having spontaneous regurgitation as result of distress behaviour. From collected samples (n = 70), 25 species of fishes (from 14 families) and one mollusk of the Cephalopoda Class, Loliginidae family, were identified. Fishes are the main food resource, with 99% of the composition of 3 seabirds diet. Though they are also the main food resource of the Redbilled Tropicbird, squids are presented as up as 10% of its diet. Regarding the habits of the identified fishes families and species in the samples, the largest percentage is of coastal species, being Clupeidae, Engraulidae and Exocoetidae fishes the more used families as preys. Magnificent Frigatebird had a larger range of preys than other species. The Red-billed Tropicbird and the Masked Booby have less prey items and their distribution is well balanced, increasing the value of the Shannon-Wiener's equitability value. The results also suggest the seabirds are possibly obtaining their food in the National Park's sea area abling the conservation unity to positively act for their protection.

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