Journal of the Marine Biological Association of the United Kingdom




LIFE HISTORY

Age and growth of some delphinids in south-eastern Brazil


Salvatore  Siciliano a1c1, Renata Maria A.  Ramos a2, Ana Paula M.  Di Beneditto a3, Marcos César O.  Santos a4, Ana Bernadete  Fragoso a1a5, José Lailson  Brito  Jr a5a6, Alexandre F.  Azevedo a5, André F. C.  Vicente a7, Emerson  Zampirolli a7, Fernando S.  Alvarenga a7, Lupércio  Barbosa a8 and Neuza Rejane W.  Lima a9
a1 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
a2 Everest Tecnologia em Serviços Ltda., Av. N. Sra. dos Navegantes, 675/s. 1201, Vitória, ES, 29050-912, Brazil
a3 Universidade Estadual do Norte Fluminense, CBB/LCA, Av. Alberto Lamego 2000, Campos dos Goytacazes, RJ, Brazil
a4 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
a5 Projeto MAQUA, Universidade do Estado do Rio de Janeiro, RJ, 20550-013, Brazil
a6 Universidade Federal do Rio de Janeiro, Laboratório de Radioisótopos EPF, Instituto de Biofísica, Rio de Janeiro, RJ, 21941-900, Brazil
a7 Centro de Estudos sobre Encalhes de Mamíferos Marinhos - CEEMAM, Av. Pinheiro Machado, 1033/13, Santos, SP, 11075-003, Brazil
a8 Organização Consciência Ambiental—ORCA, Rua São Paulo, 21, Praia da Costa, Vila Velha, ES, 29101-300, Brazil
a9 Universidade Federal Fluminense, Depto. de Biologia Geral, Instituto de Biologia, Niterói, RJ, 24001-970, Brazil

Article author query
siciliano s   [PubMed][Google Scholar] 
ramos rma   [PubMed][Google Scholar] 
di beneditto apm   [PubMed][Google Scholar] 
santos mco   [PubMed][Google Scholar] 
fragoso ab   [PubMed][Google Scholar] 
brito jl   [PubMed][Google Scholar] 
azevedo af   [PubMed][Google Scholar] 
vicente afc   [PubMed][Google Scholar] 
zampirolli e   [PubMed][Google Scholar] 
alvarenga fs   [PubMed][Google Scholar] 
barbosa l   [PubMed][Google Scholar] 
lima nrw   [PubMed][Google Scholar] 

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.

(Published Online February 26 2007)
(Received February 1 2006)
(Accepted December 28 2006)


Correspondence:
c1 Corresponding author, e-mail: sal@ensp.fiocruz.br