Phylogenetic Relationships in Pterodroma Petrels Are Obscured by Recent Secondary Contact and Hybridization
Phylogenetic Relationships in Pterodroma Petrels Are Obscured by Recent Secondary Contact and Hybridization
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DOI：
10.1371/journal.pone.0020350
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发表时间：
2011-05-31
期刊：
影响因子：
3.7
通讯作者：
Nichols, Richard A.
中科院分区：
文献类型：
--
作者：
Brown, Ruth M.;Jordan, William C.;Nichols, Richard A.
海燕（Pterodroma spp.）自1948年被发现以来，来自印度洋毛里求斯附近的圆岛的珊瑚礁一直困扰着研究人员。在这项研究中，我们调查圆岛海燕和他们最近的亲属之间的关系，使用线粒体DNA序列数据和体外寄生虫的证据。我们的研究结果显示，远没有提供明确的物种边界划分，圆岛上的物种之间的杂交导致了不同海洋盆地种群之间的遗传泄漏。岛上最常见的物种，Pterodroma arminjoniana，似乎与两种稀有物种（P. heraldica和P. neglecta）杂交，颠覆了所有三种物种的生殖隔离，允许基因流动。P. heraldica和P. neglecta在太平洋同域繁殖，在那里没有P. arminjoniana，但没有这两者之间杂交的记录存在，它们仍然保持表型上的差异。圆岛海燕的物种边界的崩溃遵循环境变化（森林砍伐和物种组成的变化，由于狩猎）在其重叠的范围。这种多物种的相互作用不仅对保护有影响，而且对我们理解进化多样化和物种形成的过程也有影响。
The classification of petrels (Pterodroma spp.) from Round Island, near Mauritius in the Indian Ocean, has confounded researchers since their discovery in 1948. In this study we investigate the relationships between Round Island petrels and their closest relatives using evidence from mitochondrial DNA sequence data and ectoparasites. Far from providing clear delimitation of species boundaries, our results reveal that hybridization among species on Round Island has led to genetic leakage between populations from different ocean basins. The most common species on the island, Pterodroma arminjoniana, appears to be hybridizing with two rarer species (P. heraldica and P. neglecta), subverting the reproductive isolation of all three and allowing gene flow. P. heraldica and P. neglecta breed sympatrically in the Pacific Ocean, where P. arminjoniana is absent, but no record of hybridization between these two exists and they remain phenotypically distinct. The breakdown of species boundaries in Round Island petrels followed environmental change (deforestation and changes in species composition due to hunting) within their overlapping ranges. Such multi-species interactions have implications not only for conservation, but also for our understanding of the processes of evolutionary diversification and speciation.