Pronounced genetic separation among varieties of the Primula cusickiana species complex, a Great Basin endemic
Pronounced genetic separation among varieties of the Primula cusickiana species complex, a Great Basin endemic
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大盆地特有报春花品种复合体之间存在明显的遗传分离
DOI：
10.1101/2021.03.19.436082
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发表时间：
2021
影响因子：
1
通讯作者：
Wolf, P
中科院分区：
文献类型：
--
作者：
Koontz, A;Pearse, WD;Wolf, P
区分具有强大遗传结构的种群和独特的物种是系统学中的一个共同挑战，特别是对于发生在分散栖息地的类群，其中异域物种形成可能很普遍，不同的群体可能在形态上相似。在天空岛环境中，物种复合体往往就是这种情况。在这些情况下，植物地理学可能有助于解释物种复合体成员之间的分类学关系，并且限制性位点相关DNA（RAD）测序方法通常用于比较数千个基因座中密切相关的分类群。在这里，我们使用RADseq澄清的边界分离的地理上不同的，但形态相似的品种的报春花物种复杂，并contextualize过去的调查结果，强大的遗传结构之间的品种。我们的遗传分析表明，这个大盆地特有的孤立的人群之间的明显分离，表明目前的品种分类复杂的成员是不准确的，并强调其保护的重要性。我们将讨论这些结果是如何对应于最近的地理模型来描述其他天空岛类群在北美西部的分布。我们的研究结果也适合到高山报春花物种复合体观察到的一个更广泛的趋势，我们认为如何土壤专业化和异型柱育种系统可能有助于频繁的多样化，通过异域物种形成在本属。
Distinguishing between populations with strong genetic structure and unique species is a common challenge in systematics, especially for taxa occurring in fragmented habitats where allopatric speciation may be widespread and distinct groups may be morphologically similar. Such is often the case with species complexes across sky island environments. In these scenarios, biogeography may help to explain the taxonomic relations between species complex members, and restriction site-associated DNA (RAD) sequencing methods are commonly used to compare closely related taxa across thousands of loci. Here we use RADseq to clarify the boundaries separating the geographically distinct but morphologically similar varieties of the Primula cusickiana species complex, and to contextualize past findings of strong genetic structure among populations within varieties. Our genetic analyses demonstrate pronounced separation between isolated populations of this Great Basin endemic, indicating that the current varietal classification of complex members is inaccurate, and emphasizing their conservation importance. We discuss how these results correspond to recent biogeographical models used to describe the distribution of other sky island taxa in western North America. Our findings also fit into a wider trend observed for alpine Primula species complexes, and we consider how edaphic specialization and heterostylous breeding systems may be contributing to frequent diversification via allopatric speciation in this genus.