Phylogeography and evolution of the Tanganyikan cichlid genus Tropheus based upon mitochondrial DNA sequences
Phylogeography and evolution of the Tanganyikan cichlid genus Tropheus based upon mitochondrial DNA sequences
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DOI：
10.1007/s00239-002-2380-7
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发表时间：
2003-01-01
影响因子：
3.9
通讯作者：
Sturmbauer, C
中科院分区：
文献类型：
--
作者：
Baric, S;Salzburger, W;Sturmbauer, C
坦噶尼喀湖是历史最悠久、种类最多的慈鱼群的港湾。许多物种被细分为许多遗传和表型截然不同的种群。它们目前的分布和遗传结构是由一系列湖平面波动形成的，这些波动导致了隔离和混合的循环，并促进了扩散事件。这种现象最好的例子之一就是特罗菲斯属。我们基于来自坦噶尼喀湖的55个种群的365个个体的线粒体DNA系统发育，这表明大约700 kA前8个主要线粒体谱系的起源几乎是同时代的。虽然七个谱系的分布仅限于湖岸的特定部分，但有一个谱系的分布要广泛得多。这一特殊的谱系被细分为四个亚谱系，它们似乎起源于大约400Ka的一次单一扩散事件。通过使用分子钟估计，结合地质数据，我们推导出了特洛伊斯殖民史的假设情景。因此，坦噶尼喀湖近代史上湖平面的主要变化与该属三个不同的多样化事件具有高度的一致性。
Lake Tanganyika harbors the oldest and most diverse species flock of cichlid fish. Many species are subdivided into numerous genetically and phenotypically distinct populations. Their present distribution and genetic structure were shaped by a series of lake level fluctuations which caused cycles of isolation and admixis and promoted dispersal events. One of the best examples of this phenomenon is the genus Tropheus. We present a comprehensive mtDNA phylogeny based upon 365 individuals of 55 populations from all over Lake Tanganyika, which suggests an almost-contemporaneous origin of eight major mitochondrial lineages about 700 Ka ago. While the distribution of seven lineages is restricted to particular sections of the lake shore, one lineage was found to have a much more widespread distribution. This particular lineage is subdivided into four sublineages which seem to have originated from a single dispersal event about 400 Ka. By using a molecular clock estimate in combination with geological data we derived a hypothetical scenario for the colonization history of Tropheus. Thereby we show a high degree of concordance between major changes of the lake level in the recent history of Lake Tanganyika and three distinct diversification events in this genus.