Mitochondrial evidence for panmixia despite perceived barriers to gene flow in a widely distributed waterbird.
Mitochondrial evidence for panmixia despite perceived barriers to gene flow in a widely distributed waterbird.
复制标题
尽管在广泛分布的水鸟中基因流动存在障碍，但线粒体证据表明存在泛混合症。
作者：
Rebekah A. Oomen;M. Reudink;J. Nocera;Christopher M. Somers;M. Clay Green;C.J. Kyle
我们检查了美国白鹈鹕（Pelecanus erythrorhynchos）的线粒体遗传结构，目的是：1）验证或反驳美国白鹈鹕是否具有恐慌性；2）了解遗传结构的缺失是否是当代过程或历史现象的结果。对来自北美分布区 19 个群体的 367 个个体的线粒体 DNA 控制区单倍型进行的序列分析揭示了群体遗传或系统发育地理学结构的缺乏。这种结构的缺乏是出乎意料的，因为：1）主要的地理障碍，如北美大陆分水岭被认为限制了扩散； 2）迁徙行为的差异预计会促进种群分化； 3）许多分布广泛的北美候鸟物种由于栖息在多个冰川保护区而表现出历史性的分化模式。此外，尽管频繁的局部灭绝和重新殖民预计会降低多样性，但在整个物种分布范围内仍保持着高单倍型多样性和许多稀有单倍型。我们的研究结果表明，美洲白鹈鹕具有较高的有效种群规模和较低的出生率。我们认为，我们在美国白鹈鹕中观察到的范围广泛的泛混合现象是由于历史和当代的高基因流动，而高流动性和缺乏有效的身体或行为障碍造成的。
We examined the mitochondrial genetic structure of American white pelicans (Pelecanus erythrorhynchos) to: 1) verify or refute whether American white pelicans are panmictic and 2) understand if any lack of genetic structure is the result of contemporary processes or historical phenomena. Sequence analysis of mitochondrial DNA control region haplotypes of 367 individuals from 19 colonies located across their North American range revealed a lack of population genetic or phylogeographic structure. This lack of structure was unexpected because: 1) Major geographic barriers such as the North American Continental Divide are thought to limit dispersal; 2) Differences in migratory behavior are expected to promote population differentiation; and 3) Many widespread North American migratory bird species show historic patterns of differentiation resulting from having inhabited multiple glacial refugia. Further, high haplotype diversity and many rare haplotypes are maintained across the species' distribution, despite frequent local extinctions and recolonizations that are expected to decrease diversity. Our findings suggest that American white pelicans have a high effective population size and low natal philopatry. We suggest that the rangewide panmixia we observed in American white pelicans is due to high historical and contemporary gene flow, enabled by high mobility and a lack of effective physical or behavioral barriers.
影响因子：
3.3
作者：
Yunxin Fu
通讯作者：
Yunxin Fu