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Deciphering the origin of mito-nuclear discordance in two sibling caddisfly species

机译：在两个兄弟Caddisfly物种中解读Mito核不和谐的起源

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摘要

An increasing number of phylogenetic studies have reported discordances among nuclear and mitochondrial markers. These discrepancies are highly relevant to widely used biodiversity assessment approaches, such as DNA barcoding, that rely almost exclusively on mitochondrial markers. Although the theoretical causes of mito-nuclear discordances are well understood, it is often extremely challenging to determine the principal underlying factor in a given study system. In this study, we uncovered significant mito-nuclear discordances in a pair of sibling caddisfly species. Application of genome sequencing, ddRAD and DNA barcoding revealed ongoing hybridization, as well as historical hybridization in Pleistocene refugia, leading us to identify introgression as the ultimate cause of the observed discordance pattern. Our novel genomic data, the discovery of a European-wide hybrid zone and the availability of established techniques for laboratory breeding make this species pair an ideal model system for studying species boundaries with ongoing gene flow.
机译：越来越多的系统发育研究报告了核和线粒体标志物之间的不转。这些差异与广泛使用的生物多样性评估方法如DNA条形码，依赖于线粒体标志物的广泛使用。虽然核心核心不间断的理论原因得到了很好的理解，但在给定的研究体系中确定主要潜在因素往往是非常挑份的。在这项研究中，我们在一对兄弟姐妹Caddisfly物种中发现了显着的核心核开标。基因组测序的应用，DDRAD和DNA条形码揭示了持续的杂交，以及更新世避难所的历史杂交，导致我们识别观察到的不间断模式的最终原因。我们的新型基因组数据，发现欧洲范围的混合区和实验室育种技术的可用性使得该物种对研究物种界限的理想模型系统进行了持续的基因流。

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