Linck Ethan, Schaack Sarah, Dumbacher John P
Department of Biology & Burke Museum of Natural History and Culture, University of Washington, Box 351800, Seattle, WA 98195, USA; Department of Biology, Reed College, 3203 S.E. Woodstock Blvd., Portland, OR 97202, USA.
Department of Biology, Reed College, 3203 S.E. Woodstock Blvd., Portland, OR 97202, USA.
Mol Phylogenet Evol. 2016 Jan;94(Pt A):113-21. doi: 10.1016/j.ympev.2015.08.018. Epub 2015 Sep 3.
"Supertramp" species are highly specialized overwater dispersers, and are useful taxa for investigating the influence of dispersal ability on speciation and diversification in island settings. The Louisiade White-eye (Zosterops griseotinctus) is a widespread avian supertramp endemic to Papua New Guinea's offshore islands. We used maximum likelihood and Bayesian inference to reconstruct phylogenetic relationships based on 2 mitochondrial and 1 nuclear loci (1813 bp total) from 88 individuals representing all 4 named subspecies and the full breadth of the species' range. We found significant geographic and population genetic structure, and support for a major clade containing the coral islets of the central Louisiade Archipelago and outlying Nissan Island. We found evidence of metapopulation structure and gene flow within the Louisiade Archipelago clade, and relatively high genetic distinctiveness of outlying island populations, including the population on volcanically-defaunated Long Island. We reject a hypothesis of panmixia within the Louisiade White-eye despite their long-range dispersal ability, and find evidence of selection against dispersal ability in populations on high-elevation islands where disturbance is rare. Our study represents a rare intraspecies phylogeny of an avian supertramp, and sheds light on patterns of evolution in highly vagile island species.
“超级流浪者”物种是高度特化的水上扩散者，是研究扩散能力对岛屿环境中物种形成和多样化影响的有用分类群。路易西亚德白眼鸟（Zosterops griseotinctus）是一种广泛分布于巴布亚新几内亚近海岛屿的特有鸟类超级流浪者。我们使用最大似然法和贝叶斯推断，基于来自代表所有4个命名亚种以及该物种整个分布范围的88个个体的2个线粒体基因座和1个核基因座（总共1813个碱基对）重建系统发育关系。我们发现了显著的地理和种群遗传结构，并支持一个主要分支，该分支包含路易西亚德群岛中部的珊瑚小岛和外围的尼桑岛。我们发现了路易西亚德群岛分支内复合种群结构和基因流动的证据，以及外围岛屿种群（包括火山上动物绝迹的长岛种群）相对较高的遗传独特性。尽管路易西亚德白眼鸟具有远距离扩散能力，但我们拒绝了其种群内随机交配的假设，并发现了在干扰稀少的高海拔岛屿种群中对扩散能力进行选择的证据。我们的研究代表了一种鸟类超级流浪者罕见的种内系统发育，并揭示了高度易变的岛屿物种的进化模式。
