Phylogeny, evolutionary history, and biogeography of Oriental-Australian rear-fanged water snakes (Colubroidea: Homalopsidae) inferred from mitochondrial and nuclear DNA sequences
Phylogeny, evolutionary history, and biogeography of Oriental-Australian rear-fanged water snakes (Colubroidea: Homalopsidae) inferred from mitochondrial and nuclear DNA sequences
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DOI：
10.1016/j.ympev.2007.10.024
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发表时间：
2008-02-01
影响因子：
4.1
通讯作者：
Stuart, Bryan L.
中科院分区：
文献类型：
--
作者：
Alfaro, Michael E.;Karns, Daryl R.;Stuart, Bryan L.
同源蛇广泛分布在东南亚各地，在其大部分活动范围内构成了爬行动物的生态优势成分。尽管它们被认为与其他无脊椎动物谱系有很好的区别，但它们的辐射的几个方面，包括科内关系、物种多样化的时间模式和生物地理史，仍在研究中。我们分析了Homalopsidac 22个物种的4个基因(3个线粒体和1个核)的序列数据，以生成迄今为止该家族最全面的系统发育图。我们还使用独立但对数正态分布的进化速率模型结合两个外部化石校准来估计家族内部的分歧时间。利用这张年表，我们推断了该科物种多样化的历史模式。最后，我们使用之前发表的172种蛇的序列数据来测试同属蛇科的单系性。系统发育分析表明，支持同源体单系的有力支持，估计冠群的年龄与22年前相似。该家族由三个主要支系组成，均起源于18-20岁的My。通过时间谱系图显示，同翅目动物在其早期历史上经历了显著更高的有效分支发生率，这与适应性辐射的假说一致。我们讨论了中新世和上新世的几个古地理因素，这些因素可能是观察到的时间变化和生物地理模式的基础。(C)2007 Elsevier Inc.保留所有权利。
Homalopsid snakes are widely distributed throughout Southeast Asia and form the ecologically dominant component of the herpetofauna over much of their range. Although they are considered well differentiated from other colubrid lineages, several aspects of their radiation including within-family relationships, temporal patterns of species diversification, and biogeographic history remain under studied. We analyzed sequence data from four genes (three mitochondrial and one nuclear) for 22 species of the Homalopsidac to generate the most comprehensive phylogeny of the family to date. We also estimated divergence times within the family using a model of independent but log-normally distributed rates of evolution in conjunction with two external fossil calibrations. Using this chronogram, we inferred historical patterns of species diversification within the family. Finally, we used previously published sequence data for 172 snake species to test for the monophyly of the Homalopsidae. Phylogenetic analysis reveals strong support for homalopsid monophyly with an estimate age of the crown group of similar to 22 MYA. The family comprises three major clades which all originated 18-20 MY. Lineage through time plots reveal that homalopsids experienced a significantly higher rate of effective cladogenesis in their early history, consistent with a hypothesis of adaptive radiation. We discuss several Miocene and Pliocene paleogeographic factors that might underlie observed patterns of temporal diversification and biogeography. (C) 2007 Elsevier Inc. All rights reserved.