Shallow mtDNA coalescence in atlantic pygmy angelfishes (Genus Centropyge) indicates a recent invasion from the Indian Ocean
Shallow mtDNA coalescence in atlantic pygmy angelfishes (Genus Centropyge) indicates a recent invasion from the Indian Ocean
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DOI：
10.1093/jhered/esj006
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发表时间：
2006-01-01
影响因子：
3.1
通讯作者：
Grant, WS
中科院分区：
文献类型：
--
作者：
Bowen, BW;Muss, A;Grant, WS
侏儒神仙鱼（Centropyge属）在印度洋-太平洋分布广泛，物种丰富，但在大西洋只有三个物种：大西洋中脊的Centropyge resplendens，加勒比海的Centropyge argi和巴西和加勒比海南部的Centropyge aurantonotus。大西洋物种仅以颜色模式区分，与西印度洋的棘头刺鱼（Centropyge acanthops，Cac）非常相似，这增加了侏儒神仙鱼最近通过南部非洲入侵大西洋的可能性。为了验证这一动物地理学假设，我们比较了454 bp的片段的线粒体DNA（mtDNA）的控制区之间的侏儒神仙鱼的亚属Xiphypops，其中包括三个大西洋物种，印度洋物种，和一个印度太平洋物种[ Centropyge（Cfi）]。印度洋物种Cac最接近大西洋物种（d = 0.059），相对于Cfi（d = 0.077）。线粒体DNA谱系表明，从印度洋直接到西大西洋的殖民路径，其次是至少两波分散到大西洋中脊。三个大西洋物种的基因树是多系的，提出了基于颜色模式的分类分配问题。不匹配的分布将大西洋创始人事件和人口扩张放在大约25万至50万年前。估计有效的女性人口规模的不匹配和合并分析是一致的创始人事件的几十个人在西大西洋，随后扩大到数百万人。
Pygmy angelfishes ( genus Centropyge) are widespread and species-rich in the Indo-Pacific, but only three species are recognized in the Atlantic: Centropyge resplendens on the Mid-Atlantic Ridge, Centropyge argi in the Caribbean, and Centropyge aurantonotus in Brazil and the southern Caribbean. Atlantic species are distinguished only by color patterns and are very similar to Centropyge acanthops (Cac) in the western Indian Ocean, raising the possibility that pygmy angelfish recently invaded the Atlantic Ocean via southern Africa. To test this zoogeographic hypothesis, we compared a 454-bp segment of the mitochondrial DNA ( mtDNA) control region among pygmy angelfishes of the subgenus Xiphypops, which includes the three Atlantic species, the Indian Ocean species, and an Indo-Pacific species [ Centropyge fisheri (Cfi)]. The Indian Ocean species Cac is closest to the Atlantic species (d = 0.059) relative to Cfi (d = 0.077). The mtDNA genealogy indicates a colonization pathway from the Indian Ocean directly to the West Atlantic, followed by at least two waves of dispersal to the Mid-Atlantic Ridge. The gene tree for the three Atlantic species is polyphyletic, raising questions about taxonomic assignments based on color pattern. Mismatch distributions place Atlantic founder events and population expansions at about 250,000-500,000 years ago. Estimates of effective female population sizes from mismatch and coalescence analyses are consistent with founder events by tens of individuals in the western Atlantic, followed by expansions to several million individuals.