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Using genome-wide SNP data obtained from high-throughput techniques based on double digest restriction siteassociated DNA sequencing (ddRAD-seq), we elucidated the migration history and genetic diversity of the Japanese population of the ecologically important brown seaweed Sargassum thunbergii (Mertens ex Roth) Kuntze. STRUCTURE and NeighborNet analyses showed a clear genetic differentiation among populations of four geographic regions: Kyushu (POP1); Sea of Japan (POP2); Hokkaido and Tohoku (POP3); and Pacifific coast from Kyushu to Kanto (POP4). Approximate Bayesian Computation (ABC) analysis indicated that POP4 diverged fifirst, followed by the separation between POP2 (the largest effffective population size) and POP3; POP1 was the last to form, shaped by the mixture of POP2 (73%) and POP4 (27%). High genetic diversity was detected in POP1 and POP2, whereas low genetic diversity was detected in POP3 and POP4. These results indicated that S.thunbergii populations of Kyushu and the Sea of Japan might have been maintained as large and stable populations gathered difffferent lineages from China, Korea and/or Japan.

基于双酶切位点DNA测序 (ddRAD-seq)的高通量技术获得全基因组单核苷酸多态性数据，通过这些数据，我们阐明了具有重要生态意义的日本褐藻种群（鼠尾藻）的迁移历史和遗传多样性。结构和邻接网分析表明在四个地理区域（九州(POP1); 日本海(POP2)；北海道和东北町(POP3)；九州至关东的太平洋沿岸(POP4)）的种群间存在着明显的遗传分化。近似贝叶斯计算(ABC)分析表明，POP 4先分化发散，其次是POP 2(最大有效种群规模)与POP 3的分离；POP 1是最后形成的，由POP 2(73%)和POP 4(27%)混合形成。POP 1和POP 2的遗传多样性较高，POP 3和POP 4的遗传多样性较低。这些结果表明，由于稳定的聚集了大量来自中国、韩国和/或日本的不同种群，九州岛和日本海的鼠尾藻种群可能一直维持不变。

参考文献：ddRAD-seq based phylogeographic study of Sargassum thunbergii (Phaeophyceae, Heterokonta) around Japanese coast