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A genomic footprint of hybrid zone movement in crested newts

机译：凤头new混合区运动的基因组足迹

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Abstract Speciation typically involves a stage in which species can still exchange genetic material. Interspecific gene flow is facilitated by the hybrid zones that such species establish upon secondary contact. If one member of a hybridizing species pair displaces the other, their hybrid zone would move across the landscape. Although theory predicts that moving hybrid zones quickly stagnate, hybrid zones tracked over one or a few decades do not always follow such a limitation. This suggests that hybrid zones have the potential to traverse considerable distances over extended periods of time. When hybrid zones move, introgression is predicted to result in biased gene flow of selectively neutral alleles, from the receding species into the advancing species. We test for such a genomic footprint of hybrid zone movement in a pair of crested newt species (genus Triturus ) for which we have a priori support for westward hybrid zone movement. We perform a multilocus phylogeographical survey and conduct Bayesian clustering analysis, estimation of ancestry and heterozygosity, and geographical cline analysis. In a 600 km wide area east of the present day hybrid zone a genomic footprint constitutes empirical evidence consistent with westward hybrid zone movement. The crested newt case suggests that hybrid zone movement can occur over an extensive span of time and space. Inferring hybrid zone movement provides fundamental insight into historical biogeography and the speciation process, and we anticipate that hybrid zones will prove to be far more mobile than currently appreciated.
机译：摘要物种形成通常涉及一个物种仍可以交换遗传物质的阶段。种间建立起杂种区的杂种区促进了种间基因的流动。如果一个杂交物种对中的一个取代另一个，则它们的杂交区将在整个景观中移动。尽管理论预测移动的混合区域会迅速停滞，但在过去的一到几十年内跟踪的混合区域并不总是遵循这样的限制。这表明混合区有可能在延长的时间段内穿越相当长的距离。当杂种区移动时，基因渗入被预测会导致选择性中性等位基因从后代物种到前进物种的偏向基因流。我们测试了一对凤头new（Triturus）中混合区运动的这种基因组足迹，为此我们对向西的混合区运动具有先验的支持。我们进行了一次多位系系地理调查，并进行了贝叶斯聚类分析，祖先和杂合度的估计以及地理系谱分析。在当今混合区以东600公里宽的区域中，基因组足迹构成了与向西混合区运动一致的经验证据。 new的案例表明，混合区运动可以在很长的时间和空间范围内发生。推断混合带的运动提供了对历史生物地理学和物种形成过程的基本了解，并且我们预计，混合带将被证明比目前所认识的移动性要强得多。

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