Two markers and one history:: phylogeography of the edible common sea urchin Paracentrotus lividus in the Lusitanian region
Two markers and one history:: phylogeography of the edible common sea urchin Paracentrotus lividus in the Lusitanian region
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DOI：
10.1007/s00227-008-0908-0
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发表时间：
2008-04-01
期刊：
影响因子：
2.4
通讯作者：
Turon, X.
中科院分区：
文献类型：
--
作者：
Calderon, I.;Giribet, G.;Turon, X.
据信，具有长寿幼虫的底栖海洋无脊椎动物具有传播能力，有助于在大地理范围内维持种群之间的遗传一致性。然而，水文和生物因素都可能限制这类幼虫的实际扩散。我们研究了可食用普通海胆Paractrotus lividus(Lamarck，1816)的种群遗传结构，以探索其在亚特兰大-地中海地区的扩散模式，更具体地说，确定直布罗陀海峡在塑造该物种遗传结构中的作用。为此，我们分析了来自大西洋和地中海盆地16个地点的158个个体的线粒体16S rRNA基因和151个个体的核单拷贝内含腺嘌呤核苷酸转运体(ANT)，跨度超过4,000公里。线粒体16S rRNA显示地中海的遗传多样性高于大西洋，并揭示了两个盆地的种群之间的急剧断裂，这可能是直布罗陀海峡以东的阿尔梅里亚-奥兰水文锋面造成的障碍的结果。这两个标志都表明，最近两个盆地的人口都发生了扩张，很可能是在梅西尼亚盐度危机之后。
Benthic marine invertebrates with long-lived larvae are believed to have dispersal capabilities that contribute to maintaining genetic uniformity among populations over large geographical scales. However, both hydrological and biological factors may limit the actual dispersal of such larvae. We studied the population genetic structure of the edible common sea urchin Paracentrotus lividus (Lamarck, 1816), to explore its dispersal patterns in the Atlanto-Mediterranean region and, more specifically, to ascertain the role of the Strait of Gibraltar in shaping the genetic structure of this species. For this purpose, we analysed 158 individuals for the mitochondrial 16S rRNA gene and 151 of these for the nuclear single-copy intron adenine nucleotide transporter (ANT) from 16 localities from the Atlantic and Mediterranean basins, spanning over 4,000 km. Mitochondrial 16S rRNA shows higher genetic diversity in the Mediterranean than in the Atlantic and reveals a sharp break between the populations of both basins, probably as a consequence of the barrier imposed by the Almeria-Oran hydrological front, situated east of the Strait of Gibraltar. Both markers suggest that a recent population expansion has taken place in both basins, most probably following the Messinian salinity crisis.