Baus E, Darrock D J, Bruford M W
Biodiversity and Ecological Processes Group, Cardiff University, Main Building, Park Place, PO Box 915, Cardiff CF10 3TL, UK.
Mol Ecol. 2005 Oct;14(11):3373-82. doi: 10.1111/j.1365-294X.2005.02681.x.
In this study, the population structure of the Lusitanian sea star Asterina gibbosa was assessed using amplified fragment length polymorphism (AFLP). One hundred and twenty-two AFLP loci were analysed in 159 individuals from eight populations from across the species' range and revealed high levels of genetic diversity, with all individuals but two harbouring a unique banding pattern. As reported for other marine invertebrates, we found high levels of genetic differentiation between the Atlantic and Mediterranean basins, suggesting that the Strait of Gibraltar represents a major barrier to dispersal for this sea star. Our assignment studies suggest that, in the Atlantic, a measurable degree of gene flow occurs between populations, which could result in the isolation-by-distance pattern of differentiation observed in this basin. In contrast, no evidence of contemporary gene flow was found in the Mediterranean, suggesting contrasting patterns of dispersal of Asterina gibbosa in the Atlantic and Mediterranean basins.
在本研究中，利用扩增片段长度多态性（AFLP）评估了葡萄牙海星（Asterina gibbosa）的种群结构。对来自该物种分布范围内八个种群的159个个体的122个AFLP位点进行了分析，结果显示出高水平的遗传多样性，除两个个体外，所有个体都具有独特的条带模式。正如其他海洋无脊椎动物的报道一样，我们发现大西洋和地中海盆地之间存在高水平的遗传分化，这表明直布罗陀海峡是这种海星扩散的主要障碍。我们的归巢研究表明，在大西洋，种群之间存在可测量程度的基因流动，这可能导致在该盆地观察到的距离隔离分化模式。相比之下，在地中海没有发现当代基因流动的证据，这表明葡萄牙海星在大西洋和地中海盆地的扩散模式形成对比。
