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. 2019 May 23;9:7757. doi: 10.1038/s41598-019-44170-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Map of sampling sites for floating and benthic populations of Sargassum horneri from the South Sea, the West Sea, the East Sea and Jeju Island along the Korean coast and also from the East China Sea (ECS), approximately 250 km off the Korean Peninsula. Floating populations (shown by small black-filled squares) were sampled from 13 different localities (the ECS population was sampled twice at different time periods in 2017) and benthic populations (small black-filled triangles) were sampled from five localities. The sampling sites of the ECS (CF17 and CF17a) and Haenam (HN; KF17a-1–4) are shown as marked areas with oblique lines connecting the points. (A) Haenam (HN; KF17a-1–4) from the South Sea. (B) Jeju Island, off the southernmost region of the mainland. This map also shows the geographical distributions of mtDNA cox3 haplotypes of S. horneri that we determined. The area of the circle is proportional to individual numbers found for the respective haplotype and different colours denote different haplotypes (red: Hap 1, green: Hap 2, blue: Hap 3). Black arrow lines represent directions of the Kuroshio Current around Korean waters. Detailed information of each sampling locality is given in Table 1. Population abbreviations as in Table 1.