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. 2019 Jun 20;9:7729. doi: 10.1038/s41598-019-44038-0

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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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Distribution ranges of (a) belugas and (b) narwhals, and (c) insert map of sampling localities of the beluga (blue) and narwhal (green) used in the study. Circles represent tissue samples used in the genomic analyses, triangles represent the skulls used in the stable isotope analysis. The collection site of specimen MCE1356 is indicated with a red circle. Sample sizes at each locality are indicated. Hatched grey area in Fig. 2c represents Disko Bay and adjacent waters. Whale illustrations in (a) and (b) by Larry Foster.