Hanna Zachary R, Cicero Carla, Bowie Rauri C K
Museum of Vertebrate Zoology, University of California, Berkeley, CA, United States of America.
Department of Integrative Biology, University of California, Berkeley, CA, United States of America.
PeerJ. 2019 Aug 6;7:e7388. doi: 10.7717/peerj.7388. eCollection 2019.
We used molecular data to assess the degree of genetic divergence across the breeding range of the orange-crowned warbler () in western North America with particular focus on characterizing the divergence between populations on the mainland of southern California and on the Channel Islands. We obtained sequences of the mitochondrial gene and genotypes at ten microsatellite data for 192 from populations spanning all four recognized subspecies. We recovered shallow, but significant, levels of divergence among populations across the species range. Our results suggest that island isolation, subspecies (delineation by morphology, ecological, and life-history characteristics), and isolation-by-distance, in that order, are the variables that best explain the geographic structure detected across the range of . Populations on the Channel Islands were genetically divergent from those on the mainland. We found evidence for greater gene flow from the Channel Islands population to mainland southern California than from the mainland to the islands. We discuss these data in the context of differentiation in phenotypic and ecological characters.
我们利用分子数据评估了北美西部橙顶莺（ ）繁殖范围内的遗传分化程度，特别着重于描述南加利福尼亚大陆种群与海峡群岛种群之间的分化情况。我们获取了来自涵盖所有四个公认亚种的种群的192只橙顶莺的线粒体基因序列以及十个微卫星数据的基因型。我们发现，在整个物种分布范围内，橙顶莺种群之间存在程度较浅但显著的分化。我们的结果表明，岛屿隔离、亚种（通过形态、生态和生活史特征划分）以及距离隔离，按此顺序，是最能解释在橙顶莺分布范围内检测到的地理结构的变量。海峡群岛上的种群在基因上与大陆种群不同。我们发现有证据表明，从海峡群岛种群到南加利福尼亚大陆的基因流动比从大陆到岛屿的基因流动更大。我们在表型和生态特征分化的背景下讨论了这些数据。
