Long-range paternal gene flow in the southern elephant seal
Long-range paternal gene flow in the southern elephant seal
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DOI：
10.1126/science.299.5607.676
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发表时间：
2003-01-31
期刊：
影响因子：
56.9
通讯作者：
Muelbert, MMC
中科院分区：
文献类型：
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作者：
Fabiani, A;Hoelzel, AR;Muelbert, MMC
雌性交配和雄性扩散被认为是典型的哺乳动物物种，尽管检测遗传扩散事件仍然很困难。像许多哺乳动物一样，南方象海豹(Mironga Leonina)表现出比核DNA标记(1-3)更大的线粒体DNA种群结构，一种可能的解释是雄性比雌性介导的基因流更大。然而，这些标记的不同有效群体大小限制了这种解释的力度。在这里，我们展示了雄性介导的遗传扩散在大约8000公里的地理范围内(从物种范围的一个极端到另一个)的证据，表明当前种群之间的基因流动在mtDNA标记上表现出固定的差异和互惠的单系，而对于一些核标记(ESU)(4)表现出显著的分化。
Female philopatry and male dispersal are thought to be typical of mammalian species, although detecting genetic dispersal events remains difficult. Like many mammals, the southern elephant seal (Mirounga leonina) shows greater population structure for mtDNA than for nuclear DNA markers (1–3) and one possible interpretation is greater male-than female-mediated gene flow. However, the different effective population sizes for these markers limit the strength of this interpretation. Here, we show evidence for male-mediated genetic dispersal over a geographic range of about 8000 km (from one extreme of the species range to the other), indicating current gene flow between populations that show fixed differences and reciprocal monophyly for mtDNA markers and significant differentiation for some nuclear markers (ESUs)(4).