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首页> 外文期刊>Journal of Heredity >Microsatellite Genetic Characterization of the Humpback Whale (Megaptera novaeangliae) Breeding Ground off Brazil (Breeding Stock A)
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Microsatellite Genetic Characterization of the Humpback Whale (Megaptera novaeangliae) Breeding Ground off Brazil (Breeding Stock A)

机译：座落在巴西（繁殖种群A）的座头鲸（Megaptera novaeangliae）繁殖的微卫星遗传特征

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摘要

The Southwestern Atlantic Ocean humpback whales wintering ground (breeding stock A) are distributed along the Brazilian coast (5–23°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 (HO = 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.
机译：西南大西洋座头鲸越冬场（繁殖种群A）分布在巴西海岸（5–23°S），它们的主要交配和产犊场位于Abrolhos Bank。我们调查了从整个西南大西洋座头鲸种群中采样的个体的遗传多样性，种群结构和相关性。从2个子区域（Abrolhos Bank，n = 229和Praia do Forte，n = 46）采样的总共275个人被筛选了9个微卫星基因座。该群体显示出高等位基因多样性（A = 12.1）和高平均杂合度（H O = 0.733）。根据线粒体DNA数据，没有检测到明显的遗传瓶颈信号。我们没有发现暂时（几年之间）遗传结构的证据，也没有来自巴西繁殖场两个亚区域的鲸鱼之间的遗传分化。我们观察到，该种群中的男性和女性比例约为1：1，这与在其他繁殖地观察到的男性偏向性别比不同。通过这项研究获得的数据没有提供社会群体内亲属关系的证据。最后，在南乔治亚岛附近采样的雌性与阿伯罗霍斯银行附近的雌性之间显示出推测的父子关系，支持了这两个区域之间的迁徙。

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