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. 2018 Jun 25;8:9658. doi: 10.1038/s41598-018-27966-1

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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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Maps of the weekly averaged SST (in °C) derived from Copernicus in March (a), May (b), July (c), September (d), November (e) and January (f) 2010–2011. Positions of bowhead whales are indicated with red dots and the green lines stand for the −1 °C isotherm (freezing point). The number of tracked individuals per week is noted at the top right of each panel. Maps were generated using R software version 3.4.3. (R Core Team (2017). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. http://www.R-project.org/).