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Age and growth of some delphinids in south-eastern Brazil

Published online by Cambridge University Press:  26 February 2007

Salvatore Siciliano
Affiliation:
Grupo de Estudos de Mamíferos Marinhos da Região dos Lagos, Laboratório de Ecologia, Departamento de Endemias Samuel Pessoa, Escola Nacional de Saúde Pública/FIOCRUZ, Rua Leopoldo Bulhões, 1480-térreo, Manguinhos, Rio de Janeiro, RJ, 21041-210, Brazil
Renata Maria A. Ramos
Affiliation:
Everest Tecnologia em Serviços Ltda., Av. N. Sra. dos Navegantes, 675/s. 1201, Vitória, ES, 29050-912, Brazil
Ana Paula M. Di Beneditto
Affiliation:
Universidade Estadual do Norte Fluminense, CBB/LCA, Av. Alberto Lamego 2000, Campos dos Goytacazes, RJ, Brazil
Marcos César O. Santos
Affiliation:
Projeto Atlantis/LabMar, Depto. de Ecologia Geral, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, Travessa 14, Cidade Universitária, São Paulo, SP, 05508-900, Brazil
Ana Bernadete Fragoso
Affiliation:
Grupo de Estudos de Mamíferos Marinhos da Região dos Lagos, Laboratório de Ecologia, Departamento de Endemias Samuel Pessoa, Escola Nacional de Saúde Pública/FIOCRUZ, Rua Leopoldo Bulhões, 1480-térreo, Manguinhos, Rio de Janeiro, RJ, 21041-210, Brazil Projeto MAQUA, Universidade do Estado do Rio de Janeiro, RJ, 20550-013, Brazil
José Lailson Brito
Affiliation:
Projeto MAQUA, Universidade do Estado do Rio de Janeiro, RJ, 20550-013, Brazil Universidade Federal do Rio de Janeiro, Laboratório de Radioisótopos EPF, Instituto de Biofísica, Rio de Janeiro, RJ, 21941-900, Brazil
Alexandre F. Azevedo
Affiliation:
Projeto MAQUA, Universidade do Estado do Rio de Janeiro, RJ, 20550-013, Brazil
André F. C. Vicente
Affiliation:
Centro de Estudos sobre Encalhes de Mamíferos Marinhos - CEEMAM, Av. Pinheiro Machado, 1033/13, Santos, SP, 11075-003, Brazil
Emerson Zampirolli
Affiliation:
Centro de Estudos sobre Encalhes de Mamíferos Marinhos - CEEMAM, Av. Pinheiro Machado, 1033/13, Santos, SP, 11075-003, Brazil
Fernando S. Alvarenga
Affiliation:
Centro de Estudos sobre Encalhes de Mamíferos Marinhos - CEEMAM, Av. Pinheiro Machado, 1033/13, Santos, SP, 11075-003, Brazil
Lupércio Barbosa
Affiliation:
Organização Consciência Ambiental—ORCA, Rua São Paulo, 21, Praia da Costa, Vila Velha, ES, 29101-300, Brazil
Neuza Rejane W. Lima
Affiliation:
Universidade Federal Fluminense, Depto. de Biologia Geral, Instituto de Biologia, Niterói, RJ, 24001-970, Brazil

Abstract

This study provides the first compilation on age and growth of some delphinids in south-eastern Brazil (18°25′S–25°45′S). A total of 154 delphinids were reported: 44 Atlantic spotted dolphin Stenella frontalis; 36 bottlenose dolphin Tursiops truncatus; 26 ‘Brazilian’ common dolphin Delphinus sp.; 20 rough-toothed dolphin Steno bredanensis; 16 Fraser's dolphin Lagenodelphis hosei; 3 false killer whale Pseudorca crassidens; 3 unidentified Stenella sp.; 2 pantropical spotted dolphin Stenella attenuata; 2 short-finned pilot whale Globicephala macrorhynchus; 1 spinner dolphin Stenella longirostris; and 1 striped dolphin Stenella coeruleoalba. Age was estimated by counting the number of growth layer groups present in the dentine in 74.5% of the sample. The growth of 92 individuals of the first five species was determined by the Gompertz model to length-at-age data. Stenella frontalis—the oldest specimen was 23 y and the asymptotic length of 224.4 cm predicted by growth curve occurred at about 20 y; T. truncatus—the oldest specimen was 26 y and the asymptotic length of 301.3 cm predicted by growth curve occurred at about 20 y; Delphinus sp.—the oldest dolphin was 18 y and the asymptotic length of 215.9 cm predicted by growth curve occurred at about 5–6 y; S. bredanensis—the oldest specimen was 24 y and the asymptotic length of 258.1 cm predicted by growth curve occurred at about 10 y; L. hosei—the oldest specimen was 19 y and the asymptotic length of 231.2 cm predicted by growth curve occurred at about 7–8 y. Only age was estimated for the other species. The age-at-length data for S. frontalis, Delphinus sp., S. bredanensis and L. hosei were consistent, suggesting a good agreement with previous work on these species. For T. truncatus, the age at asymptotic length obtained in this study might be confirmed by increasing the sample size. The information currently presented will contribute to further life history research of delphinids on the western south Atlantic coast.

Type
Research Article
Copyright
2007 Marine Biological Association of the United Kingdom

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