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首页> 外文期刊>Molecular phylogenetics and evolution >Dusky salamanders (Desmognathus, Plethodontidae) from the Coastal Plain: Multiple independent lineages and their bearing on the molecular phylogeny of the genus
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Dusky salamanders (Desmognathus, Plethodontidae) from the Coastal Plain: Multiple independent lineages and their bearing on the molecular phylogeny of the genus

机译：沿海平原的暗（Desmognathus，Plethodontidae）：多个独立谱系及其对属分子系统发育的影响

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摘要

Recent phylogenetic reassessment of the lungless salamanders (Plethodontidae) confirmed a major life-history reversal-from direct development to an aquatic larval stage-in the dusky salamanders (Desmognathus) of eastern North America. This reversal initiated high rates of lineage accumulation, reputedly generating the species richness and ecological breath that now characterize Desmognathus. Certain important aspects of the radiation, e.g., ecomorphological evolution, have been identified through intense sampling effort of Appalachian Highland lineages. However, the research preoccupation on montane species has left overlooked a significant component of dusky salamander distribution-the Coastal Plain. We present the first molecular phylogeny for Desmognathus to incorporate extensive coverage from the Atlantic and Gulf coastal plains. We examined 38 Coastal Plain populations in conjunction with 45 additional populations, representing 16 of the 19 nominal species. Bayesian analysis of 88 mitochondrial coxI haplotypes diagnosed eight independent population lineages within the Coastal Plain, a number at odds with the region's three currently recognized species. Desmognathus has apparently experienced a complex biogeographic history in this physiographic region, one involving multiple invasions and several ecological transitions from lotic to lentic habitats. (C) 2008 Elsevier Inc. All rights reserved.
机译：最近对无肺sal（Plethodontidae）的系统发育重新评估证实了北美东部暗淡sal（Desmognathus）中从直接发育到水生幼体阶段的重大生命史逆转。这种逆转引发了很高的谱系积累率，据说产生了现在Desmognathus特有的物种丰富度和生态呼吸。辐射的某些重要方面，例如生态形态演变，已经通过阿巴拉契亚高地谱系的密集采样工作得以确定。然而，对山地物种的研究重点却忽略了灰sal分布的重要组成部分-沿海平原。我们提出了Desmognathus的第一个分子系统发育学，纳入了来自大西洋和墨西哥湾沿岸平原的广泛覆盖。我们研究了38个沿海平原种群以及45个其他种群，它们代表19种名义物种中的16种。贝叶斯对88种线粒体coxI单倍型的分析诊断出沿海平原内有8个独立的种群谱系，这个数目与该地区目前公认的3个物种不符。 Desmognathus显然在这一自然地理区域经历了复杂的生物地理历史，其中包括多次入侵以及从洛蒂奇栖息地到透镜状生境的几次生态过渡。 （C）2008 Elsevier Inc.保留所有权利。

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