Complex mosaic of sexual dichromatism and monochromatism in Pacific robins results from both gains and losses of elaborate coloration
Complex mosaic of sexual dichromatism and monochromatism in Pacific robins results from both gains and losses of elaborate coloration
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DOI：
10.1111/jav.02404
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发表时间：
2020-04-01
影响因子：
1.7
通讯作者：
Omland, Kevin E.
中科院分区：
文献类型：
--
作者：
Kearns, Anna M.;Joseph, Leo;Omland, Kevin E.
太平洋知更鸟表现出一个最复杂的范围广泛的马赛克性双色和单色性。尽管鸟类学家长期以来对这种地理镶嵌的进化起源及其在恩斯特·迈尔的物种形成理论和“生物物种概念”的发展中的重要作用感兴趣，但人们对这种地理镶嵌的进化起源仍然知之甚少。限制我们了解太平洋知更鸟的性羽变化的进化的一个因素是缺乏很好的解决分类群的边界和系统发育关系的组。在这里，我们主要使用历史博物馆标本，以获得密集的采样mtDNA，核DNA，羽毛颜色和形态计量学从所有命名的类群中的辐射，以推断类群的边界和关系。我们使用这些数据来测试殖民历史，羽毛进化和减少岛屿二色性的假设。我们的数据显示，太平洋辐射知更鸟由四个不同的谱系组成，这四个谱系值得被认为是独立的物种--以前被认为是诺福克知更鸟和红顶知更鸟，以及我们建议命名的两个新物种：“所罗门知更鸟”P. polymorpha Mayr，1934年用于所罗门和布干维尔群岛的种群，和“Mayr's robin”P. pusilla Peale，1848年（为了荣誉恩斯特·迈尔对西南太平洋知更鸟的详细研究），瓦努阿图、斐济和萨摩亚的种群。我们的数据表明，整个太平洋知更鸟辐射的共同祖先最有可能是性二色性的，辐射范围内的马赛克的性羽毛颜色出现了通过反复的损失，精心制作的羽毛在男性和增益精心制作的羽毛在女性在不同的岛屿。
Pacific robins exhibit one of the most complex range-wide mosaics of sexual dichromatism and monochromatism. The evolutionary origins of this geographic mosaic remain poorly understood despite long-standing interest from ornithologists, and its influential role in the development of Ernst Mayr's theories on speciation and the 'Biological Species Concept'. One factor limiting our understanding of the evolution of sexual plumage variation in Pacific robins is a lack of well-resolved taxon boundaries and phylogenetic relationships in the group. Here, we use primarily historical museum specimens to obtain dense sampling of mtDNA, nuclear DNA, plumage color and morphometrics from all named taxa in the radiation in order to infer taxon boundaries and relationships. We use these data to test hypotheses about colonization history, plumage evolution and reduced island dichromatism. Our data show that the Pacific robin radiation comprises four distinct lineages, which warrant recognition as separate species - the previously recognized Norfolk robin P. multicolor and red-capped robin P. goodenovii, and two new species we propose to name: 'Solomon robin' P. polymorpha Mayr, 1934 for the populations on Solomon and Bougainville Islands, and 'Mayr's robin' P. pusilla Peale, 1848 (in honor of Ernst Mayr's detailed work on the southwest Pacific robins) for the populations on Vanuatu, Fiji and Samoa. Our data suggest that the common ancestor of the entire Pacific robin radiation was most likely sexually dichromatic and that the radiation-wide mosaic of sexual plumage color arose via repeated losses of elaborate plumage in males and gains of elaborate plumage in females on separate islands.