Pleistocene glacial refugia across the Appalachian Mountains and coastal plain in the millipede genus Narceus: Evidence from population genetic, phylogeographic, and paleoclimatic data
Pleistocene glacial refugia across the Appalachian Mountains and coastal plain in the millipede genus Narceus: Evidence from population genetic, phylogeographic, and paleoclimatic data
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横跨阿巴拉契亚山脉和沿海平原的千足虫属更新世冰川保护区：来自种群遗传、系统发育地理学和古气候数据的证据
作者：
Matt J. Walker;Amy K Stockman;P. Marek;J. Bond
在整个历史上冰川和目前非冰川地区广泛分布的物种提供了极好的机会，调查更新世气候变化对北美生物多样性分布的作用。许多研究表明，北方动物种群在地理分布广泛的地区表现出低水平的遗传多样性，而南方种群表现出相对较高的水平。最近，古气候数据已结合生态位为基础的分布模型，以定位可能的避难所在末次盛冰期。使用pathogitical，人口，和古气候数据，我们表明，分布和线粒体数据的千足虫属Narceus是一致的更新世避难所和随后的冰后期人口扩张的经典例子中看到的其他organismal groups.ResultsThe Narceus的地理结构揭示了一个复杂的进化历史与签名的多个避难所在北美东南部其次是两个主要的北方扩张。在阿巴拉契亚山脉南部和沿海平原发现了避难种群的证据。北方的扩张似乎是从两个独立的避难所辐射出来的，一个来自海湾沿岸平原地区，另一个来自大西洋中部沿岸地区。在末次盛冰期的分布模型Narceus显示从目前的分布，与合适的生态区集中沿着海湾和大西洋沿岸平原显着减少。我们发现，这些区域的生态适宜性推断从我们的古模型与遗传多样性水平的遗传结构的系统发育和人口估计之间有很强的相关性conclusionThe签名的气候变化，更新世期间和之后，分布的千足虫属Narceus是显而易见的遗传数据。生态位为基础的历史分布模型加强了从遗传数据得出的结论，并证明在确定可能的避难所有用。这种跨学科的植物地理学研究提供了一个全面的方法来理解这些过程，产生和维持生物多样性，以及必要的框架，探索有关进化的类群多样化的问题。
BackgroundSpecies that are widespread throughout historically glaciated and currently non-glaciated areas provide excellent opportunities to investigate the role of Pleistocene climatic change on the distribution of North American biodiversity. Many studies indicate that northern animal populations exhibit low levels of genetic diversity over geographically widespread areas whereas southern populations exhibit relatively high levels. Recently, paleoclimatic data have been combined with niche-based distribution modeling to locate possible refugia during the Last Glacial Maximum. Using phylogeographic, population, and paleoclimatic data, we show that the distribution and mitochondrial data for the millipede genus Narceus are consistent with classical examples of Pleistocene refugia and subsequent post-glacial population expansion seen in other organismal groups.ResultsThe phylogeographic structure of Narceus reveals a complex evolutionary history with signatures of multiple refugia in southeastern North America followed by two major northern expansions. Evidence for refugial populations were found in the southern Appalachian Mountains and in the coastal plain. The northern expansions appear to have radiated from two separate refugia, one from the Gulf Coastal Plain area and the other from the mid-Atlantic coastal region. Distributional models of Narceus during the Last Glacial Maximum show a dramatic reduction from the current distribution, with suitable ecological zones concentrated along the Gulf and Atlantic coastal plain. We found a strong correlation between these zones of ecological suitability inferred from our paleo-model with levels of genetic diversity derived from phylogenetic and population estimates of genetic structuring.ConclusionThe signature of climatic change, during and after the Pleistocene, on the distribution of the millipede genus Narceus is evident in the genetic data presented. Niche-based historical distribution modeling strengthens the conclusions drawn from the genetic data and proves useful in identifying probable refugia. Such interdisciplinary biogeographic studies provide a comprehensive approach to understanding these processes that generate and maintain biodiversity as well as the framework necessary to explore questions regarding evolutionary diversification of taxa.
影响因子：
3.3
作者：
Yunxin Fu
通讯作者：
Yunxin Fu
影响因子：
3.3
作者：
M. Slatkin;R. Hudson
通讯作者：
M. Slatkin;R. Hudson