Coalescent‐based hypothesis testing supports multiple Pleistocene refugia in the Pacific Northwest for the Pacific giant salamander (Dicamptodon tenebrosus)
Coalescent‐based hypothesis testing supports multiple Pleistocene refugia in the Pacific Northwest for the Pacific giant salamander (Dicamptodon tenebrosus)
复制标题
基于聚结的假设检验支持太平洋西北地区多个更新世栖息地为太平洋大鲵（Dicamptodon tenebrosus）
作者：
C. A. Steele;Andrew Storfer
许多类群的系统发育地理模式可以通过更新世冰川作用来解释。北美太平洋西北地区的温带雨林提供了这种现象的一个很好的例子，并且关于影响特有生物遗传变异的更新世保护区的数量存在相互竞争的系统发育假说。其中一种特有物种是太平洋大鲵（Dicamptodon tenebrosus）。在这项研究中，我们估计了该物种的系统发育，并使用联合建模方法来测试有关所谓更新世避难所的数量、位置和分歧时间的五个假设。单一避难所假说包括：哥伦比亚河谷的北部避难所和克拉马斯-锡斯基尤山脉的南部避难所。双重避难所假说包括这些相同的避难所，但在不同的时间分开：末次盛冰期（2万年前）、中更新世（80万年前）和早更新世（170万年前）。系统发育分析和嵌套进化枝分析的推论揭示了分别从哥伦比亚河谷和克拉马斯-锡斯基尤山脉扩展的独特的北部和南部谱系。合并模拟的结果拒绝了单一避难所假说和分离日期为晚更新世的双重避难所假说，但不拒绝预测分离日期为早更新世或中更新世的双重避难所的假说。对南北谱系分歧以来的时间的估计也表明自更新世早期到中期以来的分离。使用错配分布和“g”分布对人口扩张进行的测试揭示了北部和南部血统的人口增长。这些结果的结合提供了强有力的证据，表明该物种被限制在太平洋西北部的至少两个更新世避难所中，并随后从其中扩展出来。
Phylogeographic patterns of many taxa are explained by Pleistocene glaciation. The temperate rainforests within the Pacific Northwest of North America provide an excellent example of this phenomenon, and competing phylogenetic hypotheses exist regarding the number of Pleistocene refugia influencing genetic variation of endemic organisms. One such endemic is the Pacific giant salamander, Dicamptodon tenebrosus. In this study, we estimate this species’ phylogeny and use a coalescent modeling approach to test five hypotheses concerning the number, location and divergence times of purported Pleistocene refugia. Single refugium hypotheses include: a northern refugium in the Columbia River Valley and a southern refugium in the Klamath‐Siskiyou Mountains. Dual refugia hypotheses include these same refugia but separated at varying times: last glacial maximum (20 000 years ago), mid‐Pleistocene (800 000 years ago) and early Pleistocene (1.7 million years ago). Phylogenetic analyses and inferences from nested clade analysis reveal distinct northern and southern lineages expanding from the Columbia River Valley and the Klamath‐Siskiyou Mountains, respectively. Results of coalescent simulations reject both single refugium hypotheses and the hypothesis of dual refugia with a separation date in the late Pleistocene but not hypotheses predicting dual refugia with separation in early or mid‐Pleistocene. Estimates of time since divergence between northern and southern lineages also indicate separation since early to mid‐Pleistocene. Tests for expanding populations using mismatch distributions and ‘g’ distributions reveal demographic growth in the northern and southern lineages. The combination of these results provides strong evidence that this species was restricted into, and subsequently expanded from, at least two Pleistocene refugia in the Pacific Northwest.
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影响因子：
3.3
作者：
Alan R. Templeton;K. Crandall;C. Sing
通讯作者：
Alan R. Templeton;K. Crandall;C. Sing
影响因子：
3.3
作者：
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DOI：
10.1016/j.ympev.2004.12.001
发表时间：
2005
期刊：
Molecular phylogenetics and evolution.
影响因子：
--
作者：
Steele,CraigA;Carstens,BryanC;Storfer,Andrew;Sullivan,Jack
通讯作者：
Sullivan,Jack
影响因子：
3.3
作者：
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通讯作者：
L. Excoffier;P. Smouse;J. Quattro
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影响因子：
15.1
作者：
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通讯作者：
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