The causes of mitochondrial DNA gene tree paraphyly in birds
The causes of mitochondrial DNA gene tree paraphyly in birds
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DOI：
10.1016/j.ympev.2009.08.024
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发表时间：
2010-02-01
影响因子：
4.1
通讯作者：
Zink, Robert M.
中科院分区：
文献类型：
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作者：
McKay, Bailey D.;Zink, Robert M.
基因树谱系是一个潜在的严重问题，因为许多系统发育和系统地理研究假设物种是单系的。Funk and Omland （Funk， D.J. Omland, k.e., 2003）。从动物线粒体DNA的见解来看，物种水平的类多畸形：频率、原因和后果。为基础。启生态。另一个星球。Syst. 34, 397-423)发现，在它们的mtDNA基因树中，似乎有很高比例的鸟类（16.7%）是副葡萄的。这可能意味着mtDNA是一种不可靠的甚至是误导性的物种划分标记。我们在Funk和Omland的调查基础上进行了扩展，并确定了鸟类中物种水平parparly的原因。我们发现，在大多数情况下，偏斜是由不正确的分类引起的。在这种情况下，mtDNA通过揭露和澄清分类学错误来服务于分类学。我们发现下一个最常见的原因是由于最近的物种形成而导致的谱系分类不完整。在这里，mtDNA给出了给定时间框架的一致的进化图景，但它对划分物种没有用处，必须采用其他标准。虽然有更多的情况下，不完全的谱系分类和杂交不能区分，但由于杂交而导致的旁系的明确例子相对较少。我们最终得出的结论是，mtDNA通常是一个有用的工具，应该继续促进鸟类物种的划分。(C) 2009爱思唯尔公司版权所有。
Gene tree paraphyly is a potentially serious problem because many phylogenetic and phylogeographic studies assume species are monophyletic. Funk and Omland (Funk, D.J. Omland, K.E., 2003. Species-level paraphyly and polyphyly: frequency, causes, and consequences, with insights from animal mitochondrial DNA. Annu. Rev. Ecol. Evol. Syst. 34, 397-423) found that a seemingly high proportion of bird species (16.7%) were paraphyletic in their mtDNA gene trees. This could imply that mtDNA is an unreliable or even misleading marker for delimiting species. We expand on Funk and Omland's survey and identify the causes of species-level paraphyly in birds. We find that in most cases paraphyly is caused by incorrect taxonomy. In such cases, mtDNA serves systematics by exposing and clarifying taxonomic errors. We find the next most common cause of paraphyly to be incomplete lineage sorting due to recent speciation. Here mtDNA gives a consistent picture of evolution, given the timeframe, but it is not useful for delimiting species and other criteria must be employed. There were relatively few clear instances of paraphyly due to hybridization, though there were more cases where incomplete lineage sorting and hybridization could not be distinguished. We ultimately conclude that, far from a hindrance, mtDNA is generally a useful tool that should continue to facilitate delimitation of avian species. (C) 2009 Elsevier Inc. All rights reserved.