Phylogeography of spotted owl (Strix occidentalis) populations based on mitochondrial DNA sequences:: Gene flow, genetic structure, and a novel biogeographic pattern
Phylogeography of spotted owl (Strix occidentalis) populations based on mitochondrial DNA sequences:: Gene flow, genetic structure, and a novel biogeographic pattern
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DOI：
10.1111/j.1558-5646.1999.tb05385.x
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发表时间：
1999-06-01
期刊：
影响因子：
3.3
通讯作者：
Groth, JG
中科院分区：
文献类型：
--
作者：
Barrowclough, GF;Gutiérrez, RJ;Groth, JG
通过对斑点猫头鹰（Strix occidentalis）线粒体DNA控制区序列的研究，研究了这些北美西部森林鸟类的基因流动、遗传结构和生物地理关系。基于遗传分配和单倍型系统地理学的基因流动估计表明，在三个长期公认的亚种内存在大量的分散。然而，个体种系关系的模式表明，历史上亚种之间缺乏基因流动，亚种基本上是单系的。单倍型合并的模式使我们能够确定基因从内华达山脉到北部沿海地区最近一次流动的大致时间和方向。这三个亚种包括系统发育的物种，北方斑点猫头鹰（S. o. caurina）是加利福尼亚（S. o. occidentalis）和墨西哥斑点猫头鹰（S. o. lucida）的一个分支的姐妹；这代表了一种新的鸟类生物地理格局。加州斑点猫头鹰的核苷酸多样性明显低于其他两个亚种；这一结果与目前的人口密度模式不一致。因果解释需要假设一个严重的瓶颈或选择性的横扫，这两种情况都只局限于一个地理区域。
Mitochondrial DNA control region sequences of spotted owls (Strix occidentalis) allowed us to investigate gene flow, genetic structure, and biogeographic relationships among these forest-dwelling birds of western North America. Estimates of gene flow based on genetic partitioning and the phylogeography of haplotypes indicate substantial dispersal within three long-recognized subspecies. However, patterns of individual phyletic relationships indicate a historical absence of gene flow among the subspecies, which are essentially monophyletic. The pattern of haplotype coalescence enabled us to identify the approximate timing and direction of a recent episode of gene flow from the Sierra Nevada to the northern coastal ranges. The three subspecies comprise phylogenetic species, and the northern spotted owl (S. o. caurina) is sister to a clade of California (S. o. occidentalis) plus Mexican spotted owls (S. o. lucida); this represents a novel biogeographic pattern within birds. The California spotted owl had substantially lower nucleotide diversity than the other two subspecies; this result is inconsistent with present patterns of population density. A causal explanation requires postulating a severe bottleneck or a selective sweep, either of which was confined to only one geographic region.