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. 2020 Feb 24;10:3238. doi: 10.1038/s41598-020-59992-3

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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 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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Standard Ellipse Areas (SEAs) representing the isotopic niches of (a) 20 male (blue) and 20 female (red) Antarctic fur seals by δ¹³C and δ¹⁵N values in their whiskers and (b) isotopic niches of females according to the estimated δ¹³C value of whiskers at the Polar Front (−18.92‰): female Group 1 (red) consists of 14 individuals with mean δ¹³C values below −18.92‰; female Group 2 (grey) consists of 6 individuals with mean δ¹³C values above −18.92‰. Points are isotopic values of each whisker sample, bold dashed ellipses use 40% of data points and dotted ellipses use 95% of data points. Figure was created using R software (v3.6.1; https://www.R-project.org/).