Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.
Núcleo Milenio de Ecología y Manejo Sustentable (ESMOI), Coquimbo, Chile.
PLoS One. 2021 Nov 4;16(11):e0259595. doi: 10.1371/journal.pone.0259595. eCollection 2021.
Most benthic marine invertebrates with sedentary benthic adult phases have planktonic larvae that permit connectivity between geographically isolated populations. Planktonic larval duration and oceanographic processes are vital to connecting populations of species inhabiting remote and distant islands. In the present study, we analyzed the population genetic structure of the sea urchin Centrostephanus sylviae, which inhabits only the Juan Fernández Archipelago and the Desventuradas islands, separated by more than 800 km. For 92 individuals collected from Robinson Crusoe and Selkirk Islands (Juan Fernández Archipelago) and San Ambrosio Island (Desventuradas Islands), 7,067 single nucleotide polymorphisms (SNPs) were obtained. The results did not show a spatial genetic structure for C. sylviae; relative high migration rates were revealed between the islands. An analysis of the water circulation pattern in the area described a predominant northward water flow with periods of inverted flow, suggesting that larvae could move in both directions. Overall, this evidence suggests that C. sylviae comprises a single large population composed of individuals separated by more than 800 km.
大多数具有固着性底栖成体阶段的底栖海洋无脊椎动物都有浮游幼虫，这使得地理上隔离的种群之间能够保持联系。浮游幼虫的持续时间和海洋过程对于连接栖息在遥远岛屿上的物种的种群至关重要。在本研究中，我们分析了仅栖息于胡安·费尔南德斯群岛和德斯温图拉达斯群岛的海胆 Centrostephanus sylviae 的种群遗传结构，这两个群岛之间相隔超过 800 公里。我们从鲁滨逊克鲁索岛和塞尔扣克岛（胡安·费尔南德斯群岛）和圣安布罗西奥岛（德斯温图拉达斯群岛）采集了 92 个个体，获得了 7067 个单核苷酸多态性（SNP）。结果显示，C. sylviae 没有表现出空间遗传结构；岛屿之间存在相对较高的迁移率。对该地区水环流模式的分析表明，水流主要向北流动，并有一段时间出现反向流动，这表明幼虫可以向两个方向移动。总的来说，这些证据表明，C. sylviae 由一个由个体组成的单一大型群体组成，这些个体之间相隔超过 800 公里。
