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首页> 外文期刊>Molecular phylogenetics and evolution >Pronounced phylogeographic structure on a small spatial scale: Geomorphological evolution and lineage history in the salamander ring species Ensatina eschscholtzii in central coastal California
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Pronounced phylogeographic structure on a small spatial scale: Geomorphological evolution and lineage history in the salamander ring species Ensatina eschscholtzii in central coastal California

机译：在较小的空间范围内具有明显的植物学结构：加利福尼亚州中部沿海coastal环种Ensatina eschscholtzii的地貌演化和谱系历史

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摘要

The salamander Ensatina eschscholtzii is a classic example of a ring species, and has an intricate biogeographic history. Within a part of the ring distribution, earlier work using allozymes disclosed high levels of genetic structure in central coastal California, where the subspecies oregonensis, xanthoptica, and eschscholtzii meet. We used mitochondrial cytochrome b sequences to further examine patterns of divergence in this area, including data from 155 localities (309 individuals). Our focus is on the documentation of population-level haplotype lineages. We show that oregonensis is represented by two unrelated, phenotypically similar clades, both of which possess substantial substructure of their own. The subspecies xanthoptica includes two lineages that differ in phenotype, one of which has colonized the foothills of the Sierra Nevada. The subspecies eschscholtzii occurs mainly to the south, but some populations from a northern lineage extend into the Monterey Bay region, where they approach xanthoptica geographically. In sum, populations in the central coastal California region form a distributional patchwork, including three subspecies, three clades (which differ from the three subspecies), and ten haplotype lineages. We conclude that such striking levels of phylogeographic structure reflect interspersed episodes of spatial fragmentation, in part driven by the complex geomorphological evolution of the California Coast Range system. (C) 2008 Elsevier Inc. All rights reserved.
机译：En Ensatina eschscholtzii是环物种的经典例子，并具有复杂的生物地理历史。在环分布的一部分内，早期使用同工酶的工作揭示了加利福尼亚中部沿海地区的高水平遗传结构，那里有oregonensis，xanthoptica和eschscholtzii亚种相遇。我们使用线粒体细胞色素b序列进一步检查了该区域的差异模式，包括来自155个地区（309个个体）的数据。我们的重点是人口水平单体型谱系的文献记录。我们显示oregonensis由两个不相关的，在表型上相似的进化枝代表，它们都具有自己的实质性亚结构。黄细菌亚种包括两个表型不同的谱系，其中一个定居在内华达山脉的山麓下。 Eschscholtzii亚种主要发生在南部，但是一些来自北部血统的种群延伸到蒙特里湾地区，在地理上接近黄藻。总而言之，加利福尼亚中部沿海地区的人口组成了一个分布斑驳的地方，包括三个亚种，三个进化枝（不同于三个亚种）和十个单倍体谱系。我们得出的结论是，如此惊人的系统地理结构水平反映了空间碎片的散布事件，部分原因是加利福尼亚海岸山脉系统的复杂地貌演化。 （C）2008 Elsevier Inc.保留所有权利。

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