Saha Atal, Johansen Torild, Hedeholm Rasmus, Nielsen Einar E, Westgaard Jon-Ivar, Hauser Lorenz, Planque Benjamin, Cadrin Steven X, Boje Jesper
Tromsø Department Institute of Marine Research Tromsø Norway.
Greenland Institute of Natural Resources Nuuk Greenland.
Evol Appl. 2016 Oct 22;10(1):77-90. doi: 10.1111/eva.12429. eCollection 2017 Jan.
Genetic population structure is often used to identify management units in exploited species, but the extent of genetic differentiation may be inflated by geographic variation in the level of hybridization between species. We identify the genetic population structure of and investigate possible introgression within the genus by analyzing 13 microsatellites in 2,562 redfish specimens sampled throughout the North Atlantic. The data support an historical divergence between the "shallow" and "deep" groups, beyond the Irminger Sea where they were described previously. A third group "slope," has an extended distribution on the East Greenland Shelf, in addition to earlier findings on the Icelandic slope. Furthermore, from the Northeast Arctic and Northwest Atlantic waters are genetically different populations. In both areas, interspecific introgression may influence allele frequency differences among populations. Evidence of introgression was found for almost all the identified gene pools, but to a much lower extent than suggested earlier. Greenland waters appear to be a sympatric zone for many of the genetically independent groups. This study illustrates that the identified groups maintain their genetic integrity in this region despite introgression.
遗传种群结构常被用于确定受开发物种的管理单元，但物种间杂交水平的地理变异可能会夸大遗传分化程度。我们通过分析在北大西洋采集的2562个红鱼样本中的13个微卫星，确定了[物种名称未给出]的遗传种群结构，并研究了该属内可能的基因渗入情况。数据支持了“浅海”和“深海”群体之间的历史分歧，其范围超出了之前描述的冰岛海。第三个群体“斜坡”，除了在冰岛斜坡的早期发现外，在东格陵兰大陆架上有更广泛的分布。此外，来自东北北极和西北大西洋水域的[物种名称未给出]是遗传上不同的种群。在这两个区域，种间基因渗入可能会影响种群间的等位基因频率差异。几乎在所有已确定的[物种名称未给出]基因库中都发现了基因渗入的证据，但程度远低于早期的推测。格陵兰水域似乎是许多遗传上独立的[物种名称未给出]群体的同域分布区。这项研究表明，尽管存在基因渗入，所确定的群体在该区域仍保持其遗传完整性。
