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首页> 外文期刊>Molecular phylogenetics and evolution >Mitochondrial DNA phylogeography of the three-spined stickleback (Gasterosteus aculeatus) in Europe - Evidence for multiple glacial refugia
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Mitochondrial DNA phylogeography of the three-spined stickleback (Gasterosteus aculeatus) in Europe - Evidence for multiple glacial refugia

机译：欧洲三旋棘背鱼（Gasterosteus aculeatus）的线粒体DNA系统学-多发性冰re的证据

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摘要

An analysis of mitochondrial DNA sequence variation in 172 three-spined sticklebacks (Gasterosteus aculeatus) sampled across the European distribution range revealed three major evolutionary lineages occupying relatively large and separate geographic areas. The trans-Atlantic lineage comprised of populations spanning from the East Coast of USA to the continental Europe and was basal group to the other European lineages in the phylogeny. The European lineage included populations located in the Western and Eastern Europe, British Isles, Scandinavia as well as some parts of the Mediterranean region. The third lineage was specific to the Black Sea drainages. The within lineage structure was characterized by significant excess of low frequency haplotypes and star-like mtDNA genealogies, which suggest a recent population expansions to the formerly glaciated marine and freshwater environments. A coalescent-based method dated the splits between the major lineages to have occurred during the Saalian and Weichselian glaciations in the late Pleistocene, depending on the molecular clock calibration. The coalescent simulations further indicate high degree of genetic diversity within the lineages and a substantial increase in the genetic diversity in the European lineage relative to the ancestral level. In addition to the three major lineages, the freshwater populations in R. Neretva and L. Skadar in the Adriatic Sea coast region harboured unique and highly divergent haplotypes suggesting long independent histories of these populations. Evidence from mtDNA analyses suggests that these populations deserve a status of an evolutionary significant unit. (C) 2007 Elsevier Inc. All rights reserved.
机译：对欧洲分布范围内的172个三棘棘背鱼（Gasterosteus aculeatus）的线粒体DNA序列变异进行分析后，发现三个主要的进化谱系占据相对较大的地理区域。跨大西洋谱系包括从美国东海岸到欧洲大陆的种群，并且是系统发育史上其他欧洲谱系的基础群体。欧洲血统包括位于西欧和东欧，不列颠群岛，斯堪的那维亚以及地中海地区某些地区的人口。第三种血统是黑海流域特有的。内部谱系结构的特征是低频单倍型和星形mtDNA谱系的大量过量，这表明最近种群扩展到了以前冰川化的海洋和淡水环境。一种基于聚结的方法可以确定主要世系之间的分裂发生在更新世晚期的萨利期和魏克谢尔期冰川期间，具体取决于分子时钟校准。合并的模拟进一步表明，谱系中的遗传多样性高度，而欧洲谱系中的遗传多样性相对于祖先水平则大大增加。除了三个主要谱系之外，亚得里亚海沿岸地区的R. Neretva和L. Skadar的淡水种群还具有独特且高度不同的单倍型，表明这些种群具有悠久的独立历史。 mtDNA分析的证据表明，这些种群应具有进化重要单位的地位。 （C）2007 Elsevier Inc.保留所有权利。

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