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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.16 no.4 Curitiba  1999

https://doi.org/10.1590/S0101-81751999000400012 

Residence patterns and site fidelity in bottlenose dolphins, Tursiops truncatus (Montagu) (Cetacea, Delphinidae) off Southern Brazil

 

 

Paulo C. Simões-LopesI; Marta E. FabianII

IDepartamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina. Caixa Postal 5102, 88040-970 Florianópolis, Santa Catarina, Brasil
IIDepartamento de Zoologia, Universidade Federal do Rio Grande do Sul. Porto Alegre, Rio Grande do Sul, Brazil

 

 


ABSTRACT

Residence patterns, habitat use, range, and some population estimate of the coastal bottlenose dolphin, Tursiops truncatus (Montagu, 1821), were documented in two coastal sites in southern Brazil: Laguna (Santa Catarina) (28º30'S; 48º55'W), and Imbe/Tramandai (Rio Grande do Sul) (29º58'S; 50º07'W). Regular observations were carried out at the Laguna system for 27 months (August 1989 to December 1991). The dolphins were photo-identified using natural permanent marks. Over 4,500 photograps were taken from shore grounds 6 to 14 meters away. Up to 51 dolphins have used the estuaries of Laguna's canal and Imarui-Santo Antonio's lagoon system in 1991. A stable group of nine animals has inhabited the Imbe/Tramandai area for over 13 years. Both sites were considered distinctive geographical communities, with 5.7% interchange within their individuals. In Laguna 88.5% of the individuals were resident and the rest were nonresident. Four cases of movement along the coastline were followed and females were more resident than males.

Key words: Tursiops truncatus, bottlenose dolphin, residence patterns, site fidelity, Southern Brazil.


 

 

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ACKNOWLEDGMENTS. We are grateful to Miriam Marmontel and Fernando W. Rosas who gave away the first pictures taken at Imbé, Rio Grande do Sul. I am grateful to Edward J. Heske, Nélio B. Barros and two anonymous reviewers for critical reviews of the manuscript. The Barddal Foundation support and fapergs grant were greatly appreciated.

 

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Recebido em 04.VI.1998; aceito em 24.IX.1999.

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