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Microsatellite genetic characterization of the humpback whale (Megaptera novaeangliae) breeding ground off Brazil (breeding stock A). | LitMetric

Microsatellite genetic characterization of the humpback whale (Megaptera novaeangliae) breeding ground off Brazil (breeding stock A).

J Hered

Laboratório de Biologia Genômica e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul, Avenida Ipiranga 6681, 90619-900 Porto Alegre, RS, Brazil.

Published: May 2010

AI Article Synopsis

Article Abstract

The Southwestern Atlantic Ocean humpback whales wintering ground (breeding stock A) are distributed along the Brazilian coast (5-23 degrees S), and their main mating and calving ground is in the Abrolhos Bank. We investigated genetic diversity, population structure, and relatedness of individuals sampled from the entire Southwest Atlantic humpback whale population. A total of 275 individuals sampled from 2 subregions (Abrolhos Bank, n = 229 and Praia do Forte, n = 46) were screened for 9 microsatellite loci. This population showed a high level of allelic diversity (A = 12.1) and a high mean observed heterozygosity (H(O) = 0.733). No signal of significant genetic bottleneck was detected in accordance with the mitochondrial DNA data. We find no evidence of temporal (between years) genetic structure as well as no genetic differentiation between whales from the 2 subregions of the Brazilian breeding ground. We observed that the proportion of males and females in this population was approximately 1:1, which differs from the male-biased sex ratio observed in other breeding grounds. The data obtained through this study provided no evidence of kinship associations within social groups. Finally, a female sampled off South Georgia Islands showed a putative parent-offspring relationship with a female off Abrolhos Bank, supporting the migratory link between these 2 areas.

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http://dx.doi.org/10.1093/jhered/esp097DOI Listing

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