High gene flow on a continental scale in the polyandrous Kentish plover Charadrius alexandrinus
High gene flow on a continental scale in the polyandrous Kentish plover Charadrius alexandrinus
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DOI：
10.1111/mec.12064
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发表时间：
2012-12-01
影响因子：
4.9
通讯作者：
Szekely, Tamas
中科院分区：
文献类型：
--
作者：
Kuepper, Clemens;Edwards, Scott V.;Szekely, Tamas
基因流动促进了物种在时间和空间上的遗传同质性。基因流动可以通过将种群遗传学与交配系统联系起来的性别偏倚分散来调节。本文对分布广泛的肯特鸻亚历山德拉鸻进行了系统地理学研究。这种小型滨鸟有很大的繁殖范围，从西欧到日本，表现出异常灵活的交配系统，雌性繁殖分散程度高。我们利用线粒体（mtDNA）控制区427 bp片段、21个常染色体微卫星标记和一个Z微卫星标记分析了来自21个地点的397个无亲缘关系个体的遗传结构和基因流。我们在大陆范围内没有发现结构或距离隔离。然而，岛屿种群的遗传多样性较低，与大陆种群的分化程度中等。基于常染色体标记的遗传分化与大陆与各岛屿的距离呈正相关。单双亲遗传标记和双双亲遗传标记的比较与女性偏倚的基因流一致。母系遗传的mtDNA结构较差，而z染色体标记比常染色体微卫星标记结构更强。在遗传群内，成年男性的相关性高于女性。综上所述，我们的研究结果表明，一妻多夫制的女性在维持大地理距离上的遗传同质性方面发挥了重要作用。
Gene flow promotes genetic homogeneity of species in time and space. Gene flow can be modulated by sex-biased dispersal that links population genetics to mating systems. We investigated the phylogeography of the widely distributed Kentish plover Charadrius alexandrinus. This small shorebird has a large breeding range spanning from Western Europe to Japan and exhibits an unusually flexible mating system with high female breeding dispersal. We analysed genetic structure and gene flow using a 427-bp fragment of the mitochondrial (mtDNA) control region, 21 autosomal microsatellite markers and a Z microsatellite marker in 397 unrelated individuals from 21 locations. We found no structure or isolation-by-distance over the continental range. However, island populations had low genetic diversity and were moderately differentiated from mainland locations. Genetic differentiation based on autosomal markers was positively correlated with distance between mainland and each island. Comparisons of uniparentally and biparentally inherited markers were consistent with female-biased gene flow. Maternally inherited mtDNA was less structured, whereas the Z-chromosomal marker was more structured than autosomal microsatellites. Adult males were more related than females within genetic clusters. Taken together, our results suggest a prominent role for polyandrous females in maintaining genetic homogeneity across large geographic distances.