Dynamics of genetic and morphological diversification in an incipient intra-island radiation of Philippine rodents (Muridae: Bullimus)
Dynamics of genetic and morphological diversification in an incipient intra-island radiation of Philippine rodents (Muridae: Bullimus)
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DOI：
10.1111/jbi.13063
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发表时间：
2017-11-01
影响因子：
3.9
通讯作者：
Heaney, Lawrence R.
中科院分区：
文献类型：
--
作者：
Kyriazis, Christopher C.;Bates, John M.;Heaney, Lawrence R.
目的：研究菲律宾“新特有种”啮齿动物（Bullimus）的遗传和形态分化模式，并研究海洋岛屿上岛屿内物种形成的动态。地点：菲律宾群岛，重点是吕宋岛。方法：我们通过对一个群岛范围内的Bullimus样本的一个线粒体和三个核位点进行测序来检查遗传分化模式，我们使用系统发育、群体遗传和基于聚结的方法对其进行分析。我们还测量了吕宋岛Bullimus luzonicus的16个颅齿特征，以研究吕宋岛的形态分化。结果：时间校正的物种树分析表明，Bullimus在上新世或更新世晚期在菲律宾南部定居，并在公元前540万年后期在吕宋岛多样化。我们发现了大量的系统地理结构，其中最完整的是在岛的南部，那里最初发生了殖民化。结果表明，8个居群之间存在明显的遗传隔离，但形态计量学分析表明，其中只有2 ~ 3个居群在形态上存在差异。主要结论：吕宋褐藻的系统地理结构与吕宋岛众多孤立的山脉相对应，这可能在吕宋岛中部/北部近230万年的物种多样化中发挥了重要作用。大多数吕宋蠓种群似乎处于物种形成的过程中，只有Camarines Sur最南端的种群有资格提升到物种地位。我们在棉兰老岛发现的bagobus多样化的证据很少，这表明吕宋岛可能是一个特殊的鼠类多样化的环境。
Aim: To investigate patterns of genetic and morphological differentiation in a 'New Endemic' Philippine rodent (Bullimus) and examine the dynamics on intra-island speciation on oceanic islands.Location: The Philippine archipelago, focusing on Luzon Island.Methods: We examined patterns of genetic differentiation by sequencing one mitochondrial and three nuclear loci for an archipelago-wide sampling of Bullimus, which we analysed using phylogenetic, population genetic, and coalescent-based methods. We also measured 16 craniodental features for Bullimus luzonicus to examine morphological differentiation on Luzon.Results: Time-calibrated species tree analysis indicated that Bullimus colonized the southern Philippines during the late Pliocene or Pleistocene and diversified on Luzon during the last c. 540 kyr. We found substantial phylogeographical structure in B. luzonicus, most completely developed in the southern part of the island, where colonization initially occurred. Coalescent species delimitation analysis indicated strong support for genetic isolation among eight B. luzonicus populations, however, morphometric analyses suggested that only two or three of these populations were morphologically distinctive.Main conclusions: Phylogeographical structure in B. luzonicus largely corresponded to Luzon's numerous isolated mountain ranges, which likely played a major role in driving diversification in central/northern Luzon over the last c. 230 kyr. The majority of B. luzonicus populations appear to be in the process of speciation, with only the furthest south population from Camarines Sur warranting elevation to species status. We found little evidence for diversification in B. bagobus on Mindanao, suggesting that Luzon may be an exceptional setting for murid rodent diversification.