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首页> 美国卫生研究院文献>Ecology and Evolution >Microsatellite and mtDNA analysis of lake trout Salvelinus namaycush from Great Bear Lake Northwest Territories: impacts of historical and contemporary evolutionary forces on Arctic ecosystems
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Microsatellite and mtDNA analysis of lake trout Salvelinus namaycush from Great Bear Lake Northwest Territories: impacts of historical and contemporary evolutionary forces on Arctic ecosystems

机译：来自西北地区大熊湖的鳟鱼Salvelinus namaycush的微卫星和mtDNA分析：历史和当代进化力对北极生态系统的影响

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Resolving the genetic population structure of species inhabiting pristine, high latitude ecosystems can provide novel insights into the post-glacial, evolutionary processes shaping the distribution of contemporary genetic variation. In this study, we assayed genetic variation in lake trout (Salvelinus namaycush) from Great Bear Lake (GBL), NT and one population outside of this lake (Sandy Lake, NT) at 11 microsatellite loci and the mtDNA control region (d-loop). Overall, population subdivision was low, but significant (global FST θ = 0.025), and pairwise comparisons indicated that significance was heavily influenced by comparisons between GBL localities and Sandy Lake. Our data indicate that there is no obvious genetic structure among the various basins within GBL (global FST = 0.002) despite the large geographic distances between sampling areas. We found evidence of low levels of contemporary gene flow among arms within GBL, but not between Sandy Lake and GBL. Coalescent analyses suggested that some historical gene flow occurred among arms within GBL and between GBL and Sandy Lake. It appears, therefore, that contemporary (ongoing dispersal and gene flow) and historical (historical gene flow and large founding and present-day effective population sizes) factors contribute to the lack of neutral genetic structure in GBL. Overall, our results illustrate the importance of history (e.g., post-glacial colonization) and contemporary dispersal ecology in shaping genetic population structure of Arctic faunas and provide a better understanding of the evolutionary ecology of long-lived salmonids in pristine, interconnected habitats.
机译：解决高纬度生态系统中原始物种的遗传种群结构，可以为塑造现代遗传变异分布的冰川后演化过程提供新的见解。在这项研究中，我们分析了11个微卫星基因座和mtDNA控制区（d环）的大熊湖（GBL），北领地（NTL）湖鳟（Salvelinus namaycush）和该湖外的一个种群（北领地桑迪湖（Sandy Lake））的遗传变异。 ）。总体而言，人口细分很低，但意义重大（全球FSTθ= 0.025），成对比较表明，GBL地点与桑迪湖之间的比较对重要性具有重大影响。我们的数据表明，尽管采样区域之间的地理距离很大，GBL内的各个盆地之间也没有明显的遗传结构（全球FST = 0.002）。我们发现证据表明，GBL内部各臂之间的当代基因流动水平较低，但桑迪湖和GBL之间没有这种流动。合并分析表明，某些历史基因流发生在GBL内部以及GBL与桑迪湖之间。因此，似乎现代（持续的传播和基因流动）和历史（历史的基因流动以及大量的建立和当今有效的人口规模）因素导致了GBL中缺乏中性的遗传结构。总体而言，我们的结果说明了历史（例如，冰川后的殖民化）和当代的扩散生态学在塑造北极动物群的遗传种群结构方面的重要性，并更好地了解了原始，相互联系的栖息地中长寿鲑鱼的进化生态学。

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