Population genetic structure of the deep-sea precious red coral Hemicorallium laauense along the Hawaiian Ridge
Population genetic structure of the deep-sea precious red coral Hemicorallium laauense along the Hawaiian Ridge
复制标题
DOI：
10.1007/s00227-023-04282-5
复制
发表时间：
2023-11-01
期刊：
影响因子：
2.4
通讯作者：
Baco，Amy R.
中科院分区：
文献类型：
--
作者：
Morgan，Nicole B.;Andrews，Julia;Baco，Amy R.
深海珍贵的红珊瑚--洛氏半珊瑚（Hemicorallium laauense）在北太平洋长期以来一直被过度捕捞，用于珠宝和古玩贸易。由于珊瑚科的采样困难和分类学挑战，对这些珊瑚虫的种群结构和连通性的了解有限。我们报告了270 H的群体遗传学。利用9个微卫星位点对来自夏威夷主岛（MHI）和西北夏威夷群岛（NWHI）的16个群体的16个劳氏个体进行了研究。观察到的杂合度（0.69-0.85）一般低于预期的杂合度（0.71-0.85），除了在双子滩的人口。中等FIS值（0.01-0.20）存在于近一半的人群中。总体G 'ST（0.166）和成对值为中度至高度（-0.003至0.489）。G 'ST值还显示，海山内种群的遗传结构中等（0.12-0.22），种群之间的距离仅为3公里。DAPC表明MHI与NWHI分离，但两个NWHI站点落入MHI集群，并且来自Ka'ena Point（MHI站点）的样本似乎形成了自己的集群。会员分配显示，一些地点之间的适度混合，而三个地点几乎没有混合。同一海山上的种群在海山内的混合令人惊讶地有限。MIGRATE的结果支持了一种因距离而隔离的模式，而交换主要发生在相邻的海山之间，但Mantel试验没有支持这种模式。这些结果表明了一种混合的连接模式，一些遥远的地方连接良好，而另一些地方则更加孤立。这些珊瑚不一致的连接性可能被它们的斑块分布放大了。
The deep-sea precious red coralHemicorallium laauensehas long been overharvested in the North Pacific for the jewelry and curio trades. An understanding of the population structure and connectivity of these octocorals has been limited due to the difficulty of sampling and taxonomic challenges within the Family Coralliidae. We report on population genetics of 270H. laauenseindividuals from 16 populations throughout the Main Hawaiian Islands (MHI) and the Northwestern Hawaiian Islands (NWHI) using nine microsatellite loci. Observed heterozygosity (0.69–0.85) was generally lower than expected heterozygosity (0.71–0.85) except for the population at Twin Banks. Moderate FISvalues (0.01–0.20) were present in nearly half of the populations. Global G’ST(0.166) and pairwise values were moderate to high ( – 0.003 to 0.489). G’STvalues also show moderate genetic structuring among populations within seamounts (0.12–0.22) for populations separated by as little as 3 km. DAPC indicated separation of the MHI from the NWHI, but two NWHI sites fall into the MHI clusters and samples from Ka’ena Point (an MHI site) appear to form their own cluster. Membership assignments showed moderate admixture between some locations, while three locations showed almost no admixture. Within-seamount admixture was surprisingly limited for populations on the same seamount. A pattern of isolation by distance, with exchange primarily among adjacent seamounts, was supported by MIGRATE results but not by Mantel tests. These results suggest a mixed pattern of connectivity, with some distant locations well connected and others more isolated. The inconsistent connectivity of these corals is likely amplified by their patchy distributions.