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. 2020 Oct 29;10:18678. doi: 10.1038/s41598-020-75658-6

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© The Author(s) 2020

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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Boxplots of (a) narwhal abundance and (b) narwhal density for the four sectors where abundance data were available. The horizontal lines in the box plots refer to the medians, and the dotted orange lines in (a) and (b) to the mean SST for each sector. Scatterplots showing the relationship between narwhal abundance and (c) SST and (e) SST slope, and narwhal density and (d) SST and (f) SST slope. The Theil-Sen regression lines are shown in black and grey with the corresponding equation. The black lines refer to the Theil-Sen regressions including all estimates for each sector, and the grey dotted lines to the latest estimate for each locality. Each dot represents an abundance estimate from the 11 summer grounds that contained more than one estimate.