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. 2021 Jan 29;11:2682. doi: 10.1038/s41598-021-82071-0

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Eukaryotic phytoplankton richness patterns in the Iroise Sea in 2015. (a) Variability of phytoplankton richness (# of OTUs by samples) across our 184 samples. The figure represents the variability of phytoplankton richness (y-axis) across stations (x-axis), size-fractions (right panels) and seasons (top panels). The variability in these sections is represented by samples triplicated and sampled across two depths (when carried out). (b) Total merged phytoplankton richness over our 5 stations and 3 seasons (size of barplots, 15 samples). The color code in each barplot represents two categories of occurrence, the OTUs that are ‘shared’ (in dark gray) by at least two stations in a same season, and the OTUs ‘specific to station X’ within a season (see the respective colors in the legend). This color legend is shared with (c). (c) Rank abundance curves of all eukaryotic phytoplankton OTUs found in each season. Each OTU is represented by a bar in the graphic, the color of the bar corresponds to the same categories of occurrence as (b). The number of reads of OTUs was log-transformed for the sake of presentation. The dotted lines separate OTUs across abundance thresholds, the abundant OTUs (> 0.1% of the total read number of phytoplankton OTUs by season), the low abundant OTUs (0.1–0.01%) and the rare OTUs (< 0.01%).