CRATER LAKE COLONIZATION BY NEOTROPICAL CICHLID FISHES
CRATER LAKE COLONIZATION BY NEOTROPICAL CICHLID FISHES
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DOI：
10.1111/j.1558-5646.2012.01755.x
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发表时间：
2013-01-01
期刊：
影响因子：
3.3
通讯作者：
Meyer, Axel
中科院分区：
文献类型：
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作者：
Elmer, Kathryn R.;Lehtonen, Topi K.;Meyer, Axel
火山口湖是孤立的栖息地，特别适合调查生态和进化的分歧和物种形成模式。然而，火山口湖殖民化的模式、频率和时间一直难以确定。我们使用了一个统计比较地理学的方法，基于一个DNA数据集，推断殖民历史的两个四川火山口湖泊的人口遗传和生态上不同的慈鲷谱系：迈达斯（Amphilophus比照。citrinellus复合体）和莫加（Hypsophrys nematopus）。我们比较了两个慈鲷谱系内的人口之间的多样性估计，发现迈达斯是最遗传多样性。从近似的贝叶斯计算分析，我们推断，火山口湖都是由两个慈鲷谱系在单波殖民：马萨亚5800 +/- 300年前和Xiloa 5400 +/- 750年前。我们的结论是，自然事件可能有一个占主导地位的作用，在殖民化的火山口湖泊。此外，我们的研究结果表明，更高的物种丰富度和更快速的进化的迈达斯物种复合体，相对于其他谱系的鱼类在同一火山口湖泊，不能解释更早或更多的殖民化事件。
Volcanic crater lakes are isolated habitats that are particularly well suited to investigating ecological and evolutionary divergence and modes of speciation. However, the mode, frequency, and timing of colonization of crater lakes have been difficult to determine. We used a statistical comparative phylogeographic approach, based on a mitochondrialDNA dataset, to infer the colonization history of two Nicaraguan crater lakes by populations of genetically and ecologically divergent cichlid lineages: Midas (Amphilophus cf. citrinellus complex) and moga (Hypsophrys nematopus). We compared estimates of diversity among populations within the two cichlid lineages and found that Midas were the most genetically diverse. From an approximate Bayesian computation analysis, we inferred that the crater lakes were each founded by both cichlid lineages in single waves of colonization: Masaya 5800 +/- 300 years ago and Xiloa 5400 +/- 750 years ago. We conclude that natural events are likely to have a dominant role in colonization of the crater lakes. Further, our findings suggest that the higher species richness and more rapid evolution of the Midas species complex, relative to other lineages of fishes in the same crater lakes, cannot be explained by earlier or more numerous colonization events.