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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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Results of genetic structure using a Bayesian population assignment test with STRUCTURE for the study populations of Sargassum horneri, based on seven microsatellite markers. Each individual is represented along the X-axis, and the Y-axis denotes the probability of that individual belonging to each of the genetic clusters. (A) Analyses of population structure for the all 19 populations combined. The most likely number of genetic clusters after Delta K Evanno’s correction corresponds to K = 2. Yellow colour represents floating populations, and blue colour represents benthic populations including the floating population of KF17a-3. (B) Analyses of population structure only for the 14 floating populations. The most likely number of genetic clusters after Delta K Evanno’s correction corresponds to K = 3 but the alpha (α) value was not stabilized (when the KF17a-3 population excluded), because of the very similar genetic structure among the 13 floating populations. (C) Analyses of population structure for the five benthic populations. The most likely number of genetic clusters after Delta K Evanno’s correction corresponds to K = 4.