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Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean

机译：东南太平洋和西南大西洋巴塔哥尼亚牙鱼（Dissostichus eleginoides）的种群遗传结构

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Previous studies of population genetic structure in Dissostichus eleginoides have shown that oceanographic and geographic discontinuities drive in this species population differentiation. Studies have focused on the genetics of D. eleginoides in the Southern Ocean; however, there is little knowledge of their genetic variation along the South American continental shelf. In this study, we used a panel of six microsatellites to test whether D. eleginoides shows population genetic structuring in this region. We hypothesized that this species would show zero or very limited genetic structuring due to the habitat continuity along the South American shelf from Peru in the Pacific Ocean to the Falkland Islands in the Atlantic Ocean. We used Bayesian and traditional analyses to evaluate population genetic structure, and we estimated the number of putative migrants and effective population size. Consistent with our predictions, our results showed no significant genetic structuring among populations of the South American continental shelf but supported two significant and well-defined genetic clusters of D. eleginoides between regions (South American continental shelf and South Georgia clusters). Genetic connectivity between these two clusters was 11.3% of putative migrants from the South American cluster to the South Georgia Island and 0.7% in the opposite direction. Effective population size was higher in locations from the South American continental shelf as compared with the South Georgia Island. Overall, our results support that the continuity of the deep-sea habitat along the continental shelf and the biological features of the study species are plausible drivers of intraspecific population genetic structuring across the distribution of D. eleginoides on the South American continental shelf.
机译：以前对Dissostichus eleginoides种群遗传结构的研究表明，海洋和地理不连续性是该物种种群分化的驱动力。研究集中在南方大洋洲的D. eleginoides的遗传学。然而，关于它们在南美大陆架上的遗传变异知之甚少。在这项研究中，我们使用六个微卫星组成的小组来测试D. eleginoides是否在该区域显示种群遗传结构。我们假设该物种将显示出零个或非常有限的遗传结构，这是由于从太平洋的秘鲁到大西洋的福克兰群岛沿南美大陆架的栖息地连续性所致。我们使用贝叶斯分析和传统分析来评估人口遗传结构，并估计了假定移民的数量和有效人口规模。与我们的预测一致，我们的结果表明南美大陆架种群之间没有显着的遗传结构，但是支持了地区之间的两个重要的定义明确的D. eleginoides遗传集群（南美大陆架和乔治亚州南部集群）。这两个集群之间的遗传连通性是从南美集群到南乔治亚岛的假定移民的11.3％，而在相反方向的迁移率为0.7％。与南乔治亚岛相比，南美大陆架位置的有效人口规模更高。总体而言，我们的研究结果表明，沿大陆架的深海生境的连续性和所研究物种的生物学特征是南美大陆架上分布的D. eleginoides物种内种群遗传结构合理的驱动力。

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