Testing hypotheses of speciation timing in Dicamptodon copei and Dicamptodon aterrimus (Caudata: Dicamptodontidae).

Testing hypotheses of speciation timing in Dicamptodon copei and Dicamptodon aterrimus (Caudata: Dicamptodontidae).
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测试 Dicamptodon copei 和 Dicamptodon aterrimus(有尾目:Dicamptodontidae)的物种形成时间假设。

DOI:
10.1016/j.ympev.2004.12.001
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发表时间:
2005
期刊:
Molecular phylogenetics and evolution.
影响因子:
--
通讯作者:
Sullivan,Jack
Sullivan,Jack
中科院分区:
--
文献类型:
--
作者:
Steele,CraigA;Carstens,BryanC;Storfer,Andrew;Sullivan,Jack

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大鲵属(英语:Giant salamanders of Dicamptodon)是北美洲太平洋西北部中温带森林生态系统的成员。我们估计该属的物种发生,以测试有关物种形成和目前物种分布的起源的几个假设。具体来说,我们测试了竞争的先验假设的扩散和vicariance解释间断的内陆分布的爱达荷州大鲵(D。atrimus)和科普大鲵(D. copei)使用贝叶斯假设检验。我们确定,可用的外群太分散,有效地根的同源性,我们计算贝叶斯后验概率为15个可能的根放置这四个类群。这个分析把根放在了通向D的分支上。atrimus的分布和物种组成。atrimus符合古代的vicariance假说,并归因于喀斯喀特山脉的orphanism,而不是最近的内陆扩散。试验结果表明,D. copei是远亲其他沿海血统和可能起源早于更新世。这些结果表明,属内的物种形成是由于古老的地质事件,而更新世冰川形成的遗传变异和分布在现存的物种。
Giant salamanders of the genus Dicamptodon are members of the mesic forest ecosystem that occurs in the Pacific Northwest of North America. We estimate the phylogeny of the genus to test several hypotheses concerning speciation and the origin of current species distributions. Specifically, we test competing a priori hypotheses of dispersal and vicariance to explain the disjunct inland distribution of the Idaho giant salamander (D. aterrimus) and to test the hypothesis of Pleistocene speciation of Cope’s giant salamander (D. copei) using Bayesian hypothesis testing. We determined that available outgroups were too divergent to root the phylogeny effectively, and we calculated Bayesian posterior probabilities for each of the 15 possible root placements for this four-taxon group. This analysis placed the root on the branch leading to D. aterrimus, indicating that current distribution and speciation of D. aterrimus fit the ancient vicariance hypothesis and are attributable to the orogeny of the Cascade Mountains rather than recent inland dispersal. Furthermore, test results indicate that D. copei is distantly related to other coastal lineages and likely originated much earlier than the Pleistocene. These results suggest that speciation within the genus is attributable to ancient geologic events, while more recent Pleistocene glaciation has shaped genetic variation and distributions within the extant species.
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