Colonization of the Philippines from Taiwan: a multi-locus test of the biogeographic and phylogenetic relationships of isolated populations of shrews
Colonization of the Philippines from Taiwan: a multi-locus test of the biogeographic and phylogenetic relationships of isolated populations of shrews
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DOI：
10.1111/j.1365-2699.2010.02295.x
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发表时间：
2010-08-01
影响因子：
3.9
通讯作者：
Oliveros, Carl H.
中科院分区：
文献类型：
--
作者：
Esselstyn, Jacob A.;Oliveros, Carl H.
Aim菲律宾与台湾或亚洲大陆邻近地区的融合被认为是菲律宾北部一些动植物种群的一个重要多样性来源。然而，以前的推论是基于分类分类，有时不能反映系统发育历史。在这里，我们使用进化史的明确推论来测试菲律宾从北部到菲律宾的一群地鼠(松鼠形目：地鼠亚目)在东南亚的位置。方法我们使用来自菲律宾北部巴丹岛和沙塘岛的两个线粒体基因和三个核基因座的DNA序列来估计种群的系统发育关系。结果我们发现确凿的证据表明，巴丹和沙塘的地鼠与台湾的田中青虫和亚洲大陆的其他标本有密切的亲缘关系。贝叶斯和频率拓扑检验通过对单个基因座的比对，强烈否定了来自巴丹和沙塘的地鼠是菲律宾大马士革主要辐射的一部分的说法，表明菲律宾最北端的岛屿几乎肯定是来自台湾或亚洲大陆的地鼠殖民。主要结论我们的结果提供了第一个令人信服的证据，证明菲律宾群岛是由陆地脊椎动物通过北方路线殖民的。然而，地鼠入侵菲律宾北部并没有导致范围进一步扩大到菲律宾更南部的地区。这项研究结合之前的研究结果，证明克罗西杜拉至少殖民了菲律宾三次。然而，这些入侵中只有一次导致了就地物种形成和在整个群岛无处不在的存在。我们的发现是越来越多的文献中的一部分，这些文献表明，海洋群岛经常被密切相关的物种群体多次殖民，有时还来自多种来源。
AimColonization of the Philippines from Taiwan or neighbouring areas of the Asian mainland has been proposed as an important source of diversity for some plant and animal groups in the northern Philippines. Previous inferences, however, were based on taxonomic groupings, which sometimes fail to reflect phylogenetic history. Here, we test for colonization of the Philippines from the north in a group of shrews (Soricomorpha: Crocidura) using explicit inferences of evolutionary history.LocationSoutheast Asia.MethodsWe estimate the phylogenetic relationships of populations of shrews from Batan and Sabtang islands in the northern Philippines using DNA sequences from two mitochondrial genes and three nuclear loci. We employ topology tests to evaluate the possible relationships of these shrews to species from throughout Southeast Asia.ResultsWe find conclusive evidence that shrews from Batan and Sabtang are closely related to Crocidura tanakae from Taiwan and additional specimens from the Asian mainland. Bayesian and frequentist topology tests using alignments of individual loci strongly reject any notion that shrews from Batan and Sabtang are part of the main Philippine radiation of Crocidura, indicating that the northernmost Philippine islands were almost certainly colonized by shrews from Taiwan or mainland Asia.Main conclusionsOur results provide the first compelling evidence for colonization of the Philippine archipelago by a terrestrial vertebrate via a northern route. Invasion of the northern Philippines by shrews, however, did not lead to further range expansion to more southerly parts of the Philippines. This study, combined with previous results, documents that Crocidura colonized the Philippines at least three times. However, only one of these invasions led to in situ speciation and ubiquity across the archipelago. Our findings are part of a growing body of literature suggesting that oceanic archipelagos are often colonized multiple times by groups of closely related species, and occasionally from multiple sources.