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. 2019 Mar 12;9:4331. doi: 10.1038/s41598-019-39982-w

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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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Accumulation zone of Sargassum horneri estimated by forward-in-time particle-tracking. One thousand particles were released from each estimated origin on April 15 (spring) and July 1 (summer) and traced for 30 d. Each day’s position of the particles was regarded as an accumulation zone of floating S. horneri in 2008 (upper panels: a1, a2), 2009 (middle panels: b1, b2) and 2010 (lower panels: c1, c2), respectively for spring and summer. Number of particles per unit area with high density is shown in red, and low density in blue. (d) Possible accumulation zones of floating S. horneri (black) transported from their previously reported benthic habitats along the Japanese coast (green). Particles were released from their initial position (green) on July 1 and traced for 30 d, in 2008, 2009 and 2010, respectively. Each day’s position of the particles for the three years were pooled and regarded as an accumulation zone of floating S. horneri in summer. The maps were generated using Matlab R2011b (https://www.mathworks.com/products/matlab).