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The ecology of the bottlenose dolphin (Tursiops truncatus) is scarcely documented in Brazil. The objective of this article is to present information about the distribution, group size and behavior of T. truncatus collected oportunistically around the Island of Santa Catarina. Locality, date and time, group size and behavior were registered after each opportunistic sighting. Seventy-one groups were observed between 1989 and 2005, in all months of the year. The species was sighted along all the coast of the island, using a great variety of habitats including protected bays and exposed beaches. Group size varied from 1 to 200 individuals, with a mean group size of approximately 8 individuals (mode = 2). Interactions with three species of sea birds were also documented. Data presented here suggest that the species is common around the Island of Santa Catarina, has a great plasticity in habitat use, and a varied behavior repertoire.

biota neopropica/biota neotropica

Notas sobre a distribuição, tamanho de grupo e comportamento do golfinho Tursiops truncatus (Cetacea: Delphinidae) na Ilha de Santa Catarina, sul do Brasil