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首页> 外文期刊>Marine biology >Genetic structure of Patagonian toothfish (Dissostichus eleginoides) populations on the Patagonian Shelf and Atlantic and western Indian Ocean Sectors of the Southern Ocean
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Genetic structure of Patagonian toothfish (Dissostichus eleginoides) populations on the Patagonian Shelf and Atlantic and western Indian Ocean Sectors of the Southern Ocean

机译：巴塔哥尼亚大陆架和大西洋以及印度洋西部印度洋上巴塔哥尼亚牙鱼（Dissostichus eleginoides）种群的遗传结构

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摘要

The genetic structure of Patagonian toothfish populations in the Atlantic and western Indian Ocean Sectors of the Southern Ocean (SO) were analysed using partial sequences of the mitochondrial 12S rRNA gene and seven microsatellite loci. Both haplotype frequency data (F_(ST) > 0.906, P < 0.01) and microsatellite genotype frequency data (F_(ST) = 0.0141-0.0338, P < 0.05) indicated that populations of toothfish from around the Falkland Islands were genetically distinct from those at South Georgia (eastern Atlantic Sector SO), around Bouvet Island (western Atlantic Sector SO) and the Ob Se-amount (western Indian Ocean Sector of the SO). Genetic differentiation between these populations is thought to result from hydrographic isolation, as the sites are separated by two, full-depth, ocean-fronts and topographic isolation, as samples are separated by deep water. The South Georgia, Bouvet and Ob Seamount samples were characterised by an identical haplotype. However, microsatellite genotype frequencies showed genetic differentiation between South Georgia samples and those obtained from around Bouvet Island and nearby seamounts (F_(ST) = 0.0037, P < 0.05). These areas are separated by large geographic distance and water in excess of 3,000 m deep, below the distributional range of toothfish ( < 2,200 m). No significant genetic differentiation was detected between samples around Bouvet Island and the Ob Seamount although comparisons may have been influenced by low sample size. These localities are linked by topographic features, including both ridges and seamounts, that may act as oceanic "stepping stones" for migration between these populations. As for other species of deep-sea fish, Patagonian toothfish populations are genetically structured at the regional and sub-regional scales.
机译：使用线粒体12S rRNA基因的部分序列和七个微卫星基因座，分析了大西洋和南印度洋西印度洋地区巴塔哥尼亚牙鱼种群的遗传结构。单倍型频率数据（F_（ST）> 0.906，P <0.01）和微卫星基因型频率数据（F_（ST）= 0.0141-0.0338，P <0.05）均表明，福克兰群岛周围的齿鱼种群在遗传上不同于那些在佐治亚州南部（大西洋南部的SO区域），布维岛（西南大西洋区域的SO）和Ob Se-amount（西南印度洋的区域）周围。这些种群之间的遗传分化被认为是由于水文隔离所致，因为地点被两个深水隔离的全深度海面和地形隔离所分隔。佐治亚州南部，布韦和海山样品的特征是相同的单倍型。然而，微卫星基因型频率显示了乔治亚州南部样本与从布维岛和附近海山获得的样本之间的遗传分化（F_（ST）= 0.0037，P <0.05）。这些区域之间相距遥远，水深超过3,000 m，低于牙鱼的分布范围（<2,200 m）。尽管比较可能受到样本量较小的影响，但在布韦岛和Ob Seamount附近的样本之间未检测到明显的遗传分化。这些地区与地形特征相关联，包括山脊和海山，这些地形特征可作为这些种群之间迁移的海洋“垫脚石”。至于其他深海鱼类，巴塔哥尼亚牙鱼种群在区域和次区域范围内都是遗传结构。

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