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. 2018 Dec 24;8:18059. doi: 10.1038/s41598-018-36345-9

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© The Author(s) 2018

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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Cluster analysis of 61 diatom read samples based on a Bray-Curtis dissimilarity matrix of OTUs. The main clusters are related to the geographic origin of samples, as highlighted by coloured bars. The coloured dots indicate samples from sediments, which always clustered with the planktonic ones of the corresponding site. Blanes (Mediterranean) communities clustered with those from Roscoff (Atlantic Ocean) while Varna (Black Sea) communities clustered with those from Oslo (Skagerrak).