Phylogeography of a post-glacialcolonizer:: Microtus longicaudus (Rodentia: Muridae)
Phylogeography of a post-glacialcolonizer:: Microtus longicaudus (Rodentia: Muridae)
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DOI：
10.1046/j.1365-294x.2000.00846.x
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发表时间：
2000-02-01
影响因子：
4.9
通讯作者：
Cook, JA
中科院分区：
文献类型：
--
作者：
Conroy, CJ;Cook, JA
利用线粒体细胞色素b基因DNA序列对长尾田鼠的分子系统学进行了研究。我们使用系统发育和成对距离的方法来重建该物种的历史，特别强调太平洋西北部。该物种的遗传变异与更新世以及随后劳伦蒂冰盖和科迪勒兰冰盖消退后北部冰后扩张期间的更新换代事件一致。在科罗拉多河东南部(亚利桑那州东部、科罗拉多州、怀俄明州和新墨西哥州)发现的种群与所有其他西部种群之间存在着最大的突破(>；6%未校正的序列差异)。其他得到很好支持的亚纲由来自：(I)阿拉斯加东南部岛屿和北海岸；(Ii)阿拉斯加东部、不列颠哥伦比亚省、华盛顿州和俄勒冈州；以及(Iii)加利福尼亚州北部、爱达荷州和蒙大拿州的样本组成。在亚支系内部，分歧很小。我们的结果表明，北部亚纲内部单倍型之间的密切关系是最近殖民的结果，而亚纲间较高的分化是长期隔离的遗传分化造成的，可能是中更新世气候事件的结果。
The molecular phylogeography of Microtus longicaudus was investigated with DNA sequences of the mitochondrial cytochrome b gene. We used phylogenetic and pairwise distance methods to reconstruct the history of the species with particular emphasis on the Pacific Northwest. Genetic variation across the species was consistent with vicariant events during the Pleistocene and subsequent northern postglacial expansion following the receding Laurentide and Cordilleran ice sheets. The largest break (> 6% uncorrected sequence divergence) was found to exist between populations found southeast of the Colorado River (eastern Arizona, Colorado, Wyoming and New Mexico) and all other western populations. Other well-supported subclades were composed of samples from: (i) the islands and north coast of southeast Alaska; (ii) eastern Alaska, British Columbia, Washington and Oregon; and (iii) northern California, Idaho and Montana. Within subclades, divergence was low. Our results suggest that the close relationships among haplotypes within northern subclades are a result of recent colonization, whereas higher among-subclade divergence is caused by genetic differentiation during prolonged periods of isolation, possibly as a result of mid-Pleistocene climatic events.