Aix-Marseille Université, CNRS UMR 6540 DIMAR, Centre d'Océanologie de Marseille, Station Marine d'Endoume, Chemin de la Batterie des Lions, 13007 Marseille, France.
Mol Ecol. 2010 Feb;19(4):675-90. doi: 10.1111/j.1365-294X.2009.04516.x. Epub 2010 Jan 14.
Combined action from over-harvesting and recent mass mortality events potentially linked to ongoing climate changes has led to new concerns for the conservation of shallow populations (5-60 m) of Corallium rubrum, an octocorallian that is mainly found in the Mediterranean Sea. The present study was designed to analyse population structure and relationships at different spatial scales (from 10s of meters to 100s of kilometres) with a focus on dispersal pattern. We also performed the first analysis of the distribution of genetic diversity using a comparative approach between regional-clusters and samples. Forty populations dwelling in four distinct regions between 14 and 60 m in depth were genotyped using 10 microsatellites. Our main results indicate (i) a generalized pair-sample differentiation combined with a weak structure between regional-clusters; (ii) the occurrence of isolation by distance at the global scale, but also within two of the three analysed regional-clusters; (iii) a high level of genetic diversity over the surveyed area with a heterogeneous distribution from regional-cluster to sample levels. The evolutionary consequences of these results are discussed and their management implications are provided.
过度捕捞和最近与持续气候变化有关的大量死亡事件的联合作用，导致人们对分布在浅海（5-60 米）的柳珊瑚（Corallium rubrum）的保护产生了新的关注。这项研究旨在分析不同空间尺度（从数十米到数百公里）的种群结构和关系，重点关注扩散模式。我们还使用区域聚类和样本之间的比较方法，首次分析了遗传多样性的分布。在 14 到 60 米的四个不同深度的四个区域，我们使用 10 个微卫星对 40 个种群进行了基因型分析。我们的主要结果表明：（i）普遍存在成对样本分化，加上区域聚类之间的弱结构；（ii）在全球范围内发生了距离隔离，但在三个分析的区域聚类中的两个中也发生了这种情况；（iii）在调查区域内存在高水平的遗传多样性，在区域聚类到样本水平上存在不均匀的分布。讨论了这些结果的进化后果，并提供了管理方面的启示。
