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Evaluation of periotic–timpanic bone complex of Sotalia guianensis (Cetacea: Delphinidae) as tool in identification of geographic variations

Published online by Cambridge University Press:  17 December 2013

Danilo Leal Arcoverde ,
Renata Emin-Lima ,
Alexandra Fernandes Costa ,
Ana Paula Madeira Di Beneditto ,
Salvatore Siciliano ,
Leonardo Sena ,
Ignacio Benites Moreno  and
José De Sousa E Silva Jr
Danilo Leal Arcoverde*
Affiliation:
Universidade Federal do Pará, Biologia e Conservação de Mamíferos Aquáticos da Amazônia (BioMA), Rua Augusto Corrêa, 01, Guamá, CEP 66075-110, Belém, PA, Brasil
Renata Emin-Lima
Affiliation:
Museu Paraense Emílio Goeldi, Setor de Mastozoologia, Grupo de Estudo de Mamíferos Aquáticos da Amazônia (GEMAM). Av. Perimetral No. 1901, Terra Firme, CEP 66077-530 Belém, PA, Brazil
Alexandra Fernandes Costa
Affiliation:
Museu Paraense Emílio Goeldi, Setor de Mastozoologia, Grupo de Estudo de Mamíferos Aquáticos da Amazônia (GEMAM). Av. Perimetral No. 1901, Terra Firme, CEP 66077-530 Belém, PA, Brazil
Ana Paula Madeira Di Beneditto
Affiliation:
Universidade Estadual do Norte Fluminense (UENF), Laboratório de Ciências Ambientais (LCA), Centro de Biociências e Biotecnologia (CBB), Av. Alberto Lamego, 2000, CEP 28013-602 Campos dos Goytacazes, RJ, Brazil
Salvatore Siciliano
Affiliation:
Museu Paraense Emílio Goeldi, Setor de Mastozoologia, Grupo de Estudo de Mamíferos Aquáticos da Amazônia (GEMAM). Av. Perimetral No. 1901, Terra Firme, CEP 66077-530 Belém, PA, Brazil Escola Nacional de Saúde Pública/FIOCRUZ, Rua Leopoldo Bulhões 1480, 6° andar-sala 611, Manguinhos, CEP 21041-210, Rio de Janeiro, RJ, Brazil
Leonardo Sena
Affiliation:
Universidade Federal do Pará, Biologia e Conservação de Mamíferos Aquáticos da Amazônia (BioMA), Rua Augusto Corrêa, 01, Guamá, CEP 66075-110, Belém, PA, Brasil
Ignacio Benites Moreno
Affiliation:
Universidade Federal do Rio Grande do Sul (UFRGS), Laboratório de Sistemática e Ecologia de Aves e Mamíferos Marinhos, Departamento de Zoologia, Av. Bento Gonçalves, 9500, Bloco IV, Prédio 43435, Sala 219, CEP 90650-000 Porto Alegre, RS, Brazil.
José De Sousa E Silva Jr
Affiliation:
Museu Paraense Emílio Goeldi, Setor de Mastozoologia, Grupo de Estudo de Mamíferos Aquáticos da Amazônia (GEMAM). Av. Perimetral No. 1901, Terra Firme, CEP 66077-530 Belém, PA, Brazil
*
Correspondence should be addressed to: D.L. Arcoverde, Biologia e Conservação de Mamíferos Aquáticos da Amazônia (BioMA), Belém, Pará, Brazil email: [email protected]
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Abstract

Morphometric characteristics of the periotic–timpanic bone complex in the middle ear of cetaceans, are effective characteristics in evaluating systematics. However, they have not been used for studies of geographic variation regarding dolphins of the genus Sotalia. This study aimed to compare the periotic–timpanic of Sotalia guianensis from four distinct locations, considered here as different operational taxonomic units, Amapá/Pará (AM/PA), Maranhão/Piauí (MA/PI), Ceará (CE), and Rio de Janeiro (RJ), using 21 morphometric measurements. Multivariate analysis showed significant distinction mainly between the units of northern (AM/PA and MA/PI) and south-eastern (RJ) Brazilian coast. The timpanic bone showed variation, reaching larger sizes in the Brazilian south coast unit, corroborating current molecular data on the geographic variation of S. guianensis.

Keywords

Sotalia guianensisperiotic–timpanictraditional morphometry
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 6 , September 2014 , pp. 1127 - 1132
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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