Mosaic patterns of diversification dynamics following the colonization of Melanesian islands
Mosaic patterns of diversification dynamics following the colonization of Melanesian islands
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DOI：
10.1038/srep16016
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发表时间：
2015-11-03
影响因子：
4.6
通讯作者：
Balke, Michael
中科院分区：
文献类型：
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作者：
Toussaint, Emmanuel F. A.;Hendrich, Lars;Balke, Michael
在新殖民的海洋岛屿上，新定居的散布者的命运是岛屿生物地理学的一个中心主题。越来越复杂的宏观进化模式推断方法的出现，为更深入地理解这些在海洋岛屿殖民后的谱系多样化模式的控制机制铺平了道路。在此，我们推断了美拉尼西亚Exocelina潜水甲虫的全面分子系统发育。在此基础上，利用历史生物地理学和多样化率推断的最新方法，对这些昆虫的时空演化进行了研究。中新世中期的澳大利亚起源是在中新世晚期对新几内亚和新喀里多尼亚的独立殖民事件之后。在新几内亚的一次殖民导致了大约150个物种的大量辐射，在新喀里多尼亚的3次独立殖民产生了大约40个物种。瓦努阿图、夏威夷和中国相对较晚的殖民只在每个地区留下了一两个物种。这些昆虫在美拉尼西亚岛屿上的多样化轨迹可能与岛屿的大小、年龄和殖民化阶段的生态机会的可用性有关。
The fate of newly settled dispersers on freshly colonized oceanic islands is a central theme of island biogeography. The emergence of increasingly sophisticated methods of macroevolutionary pattern inference paves the way for a deeper understanding of the mechanisms governing these diversification patterns on lineages following their colonization of oceanic islands. Here we infer a comprehensive molecular phylogeny for Melanesian Exocelina diving beetles. Recent methods in historical biogeography and diversification rate inference were then used to investigate the evolution of these insects in space and time. An Australian origin in the mid-Miocene was followed by independent colonization events towards New Guinea and New Caledonia in the late Miocene. One colonization of New Guinea led to a large radiation of >150 species and 3 independent colonizations of New Caledonia gave rise to about 40 species. The comparably late colonizations of Vanuatu, Hawaii and China left only one or two species in each region. The contrasting diversification trajectories of these insects on Melanesian islands are likely accounted for by island size, age and availability of ecological opportunities during the colonization stage.