We surveyed mitochondrial, autosomal, and Z chromosome diversity within and between the Copperback Quail‐thrush Cinclosoma clarum and Chestnut Quail‐thrush C. castanotum , which together span the arid and semi‐arid zones of southern Australia, and primarily from specimens held in museum collections. We affirm the recent taxonomic separation of the two species and then focus on diversity within the more widespread of the two species, C. clarum . To guide further study of the system and what it offers to understanding the genomics of the differentiation and speciation processes, we develop and present a hypothesis to explain mitonuclear discordance that emerged in ourdata. Following a period of historical allopatry, secondary contact has resulted in an eastern mitochondrial genome replacing the western mitochondrial genome in western populations. This is predicted under a population‐level invasion in the opposite direction, that of the western population invading the range of the eastern one. Mitochondrial captures can be driven by neutral, demographic processes, or adaptive mechanisms, and we favor the hypothesized capture being driven by neutral means. We cannot fully reject the adaptive process but suggest how these alternatives may be further tested. We acknowledge an alternative hypothesis, which finds some support in phenotypic data published elsewhere, namely that outcomes of secondary contact have been more complex than our current genomic data suggest. Discriminating and reconciling these two alternative hypotheses, which may not be mutually exclusive, could be tested with closer sampling at levels of population, individual, and nucleotide than has so far been possible. This would be further aided by knowledge of the genetic basis to phenotypic variation described elsewhere.

中文翻译：

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抢劫正在进行中：历史博物馆的收藏揭示了在澳大利亚南部分布广泛的鸟类中的线粒体捕获，即铜背鹌鹑画眉犀牛克拉姆。

我们调查中和Copperback鹌鹑画眉之间线粒体，常染色体和Z染色体多样性Cinclosoma克拉鲁姆和栗子鹌鹑画眉C. castanotum，它们一起在博物馆举行的标本跨越澳大利亚南部的干旱和半干旱地区，以及主要集合。我们确认最近对这两个物种进行了分类分离，然后将重点放在两个物种C. clarum的更广泛分布范围内。。为了指导对该系统的进一步研究及其对理解分化和物种形成过程的基因组学的作用，我们开发并提出了一个假设以解释我们数据中出现的微核不和谐。经过一段历史的变色期，二次接触导致东部线粒体基因组取代了西部人群中的西部线粒体基因组。可以预见，这是在相反的人口水平入侵下进行的，西部人口入侵东部人口的范围。线粒体捕获可由中性，人口统计学过程或适应性机制驱动，我们赞成由中性手段驱动的假定捕获。我们不能完全拒绝自​​适应过程，但建议如何进一步测试这些替代方案。我们承认了另一种假设，该假设在其他地方发表的表型数据中得到了一些支持，即二次接触的结果比我们目前的基因组数据所暗示的更为复杂。区分和调和这两个可能互不排斥的假设，可以用比迄今为止可能的更紧密的抽样方法在人口，个体和核苷酸水平上进行检验。这将通过在其他地方描述的表型变异的遗传基础知识得到进一步的帮助。可以在人口，个体和核苷酸水平上进行更紧密的抽样测试，这是迄今为止所没有的。这将通过在其他地方描述的表型变异的遗传基础知识得到进一步的帮助。可以在人口，个体和核苷酸水平上进行更紧密的抽样测试，这是迄今为止所没有的。这将通过在其他地方描述的表型变异的遗传基础知识得到进一步的帮助。