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. 2019 Oct 10;9:14532. doi: 10.1038/s41598-019-51074-3

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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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Mean of cell concentration estimates from samples collected at 5 m by survey day through the full course of the 2013 A. catenella bloom in Salt Pond. LSU_FC data are revised estimates of cell concentration based on comparison to microscopy counts as described in the text. Gray bars indicate PST levels measured by mouse bioassay in Mytelis edulis collected from Salt Pond by the Massachusetts Department of Marine Fisheries (limit of detection: 40 µg STX eq./100 g shellfish meat). Linear correlations between PST levels and cell concentrations from 7 days previously as measured by microscopy and sxtA (n = 8) were highly significant (r² = 0.93, 0.91, respectively, p < 0.0001 for both).