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Evaluation of the video-identification technique applied to bottlenose dolphins (Tursiops truncatus) in Cagarras Archipelago, Rio de Janeiro, Brazil

Published online by Cambridge University Press:  26 November 2008

Liliane Lodi ,
Luiz Cláudio Mayerhofer  and
Cassiano Monteiro Neto
Liliane Lodi*
Affiliation:
Instituto de Estudos da Ecologia de Mamíferos Marinhos, Rua Visconde do Rio Branco, 869, Niterói—Rio de Janeiro, Brazil. 24020-006
Luiz Cláudio Mayerhofer
Affiliation:
Instituto de Estudos da Ecologia de Mamíferos Marinhos, Rua Visconde do Rio Branco, 869, Niterói—Rio de Janeiro, Brazil. 24020-006
Cassiano Monteiro Neto
Affiliation:
Instituto de Biologia, Universidade Federal Fluminense, Caixa Postal 100644, Niterói—Rio de Janeiro, Brazil, 24001-970
*
Correspondence should be addressed to: Liliane Lodi, Instituto de Estudos da Ecologia de Mamíferos Marinhos, Rua Visconde do Rio Branco 869, Niterói—Rio de Janeiro, Brazil. 24020-006 email: lilodi@uninet.com.br
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Abstract

Reliable methods to identify and monitor cetacean individuals are important to assess population behaviour and ecology. We describe and evaluate the application of the digital video-identification technique (DVI) for the acquisition and analysis of dorsal fin images in the study of bottlenose dolphins (Tursiops truncatus) in the Cagarras Archipelago, Rio de Janeiro, Brazil. Between August and November 2004, we identified and catalogued 20 individuals; 80% were re-sighted more than twice. The Individual Residence Index varied between 1.0 (N = 1) and 0.2 (N = 4). Compared with traditional photo-identification methods, DVI offers significant advantages in respect to production of sequential images and speed of editing and processing.

Keywords

evaluationvideo-identificationbottlenose dolphinsCagarras ArchipelagoRio de JaneiroBrazil
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Special Issue 5: Cetaceans , August 2009 , pp. 1077 - 1081
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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