Tripartite genetic subdivisions in the ornate shrew (Sorex ornatus)
Tripartite genetic subdivisions in the ornate shrew (Sorex ornatus)
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华丽鼩鼱 (Sorex ornatus) 的三重遗传细分
DOI：
10.1046/j.1365-294x.2001.01178.x
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发表时间：
2001
影响因子：
4.9
通讯作者：
R. Wayne
中科院分区：
文献类型：
--
作者：
J. Maldonado;C. Vilà;R. Wayne
我们研究了细胞色素B序列的变化，在251华丽的鼩（Sorex ornatus）从20个地点分布在其地理范围。此外，流浪汉（S。vagrans）和山地（S. monticolus）的鼩 鼱作为外群。我们在来自加州（美国）和下加利福尼亚（墨西哥）的华丽鼩中发现了24种单倍型，在392 bp的线粒体DNA（mtDNA）序列中存在1-31个替换。在一个子集的个人，我们测序699 bp的细胞色素B，以更好地解决种群的地理关系。华丽鼩的地理结构分为三个单倍型分支，分别代表南部，中部和北方的地方。等位酶变异分析揭示了相似的变异模式。其他几种小型加州脊椎动物也有类似的三部分遗传亚群模式。我们认为，地形障碍和扩张和收缩的湿地栖息地在中央谷在更新世冰期旋回占这些模式的遗传变异。值得注意的是，北方华丽鼩的分支在遗传学上与另一种鼩属聚集在一起，这表明它可能是一种独特的低地流浪鼩属，与它们在南加州的同类平行进化。
We examined cytochrome b sequence variation in 251 ornate shrews (Sorex ornatus) from 20 localities distributed throughout their geographical range. Additionally, vagrant (S. vagrans) and montane (S. monticolus) shrews from four localities were used as outgroups. We found 24 haplotypes in ornate shrews from California (USA) and Baja California (Mexico) that differed by 1–31 substitutions in 392 bp of mitochondrial DNA (mtDNA) sequence. In a subset of individuals, we sequenced 699 bp of cytochrome b to better resolve the phylogeographic relationships of populations. The ornate shrew is phylogeographically structured into three haplotype clades representing southern, central and northern localities. Analysis of allozyme variation reveals a similar pattern of variation. Several other small California vertebrates have a similar tripartite pattern of genetic subdivision. We suggest that topographic barriers and expansion and contraction of wetland habitats in the central valley during Pleistocene glacial cycles account for these patterns of genetic variation. Remarkably, the northern ornate shrew clade is phylogenetically clustered with another species of shrew suggesting that it may be a unique lowland form of the vagrant shrew that evolved in parallel to their southern California counterparts.