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. 2023 May 16;13:7914. doi: 10.1038/s41598-023-34771-y

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© The Author(s) 2023

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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Scatterplot of δ¹³C (‰) and δ¹⁵N (‰) values of Early (circle), Middle (square) and Late (diamond) individuals also differentiating between coastal (orange) and inland (light blue) sites; terrestrial animals from this study and the literature^8,45 are also plotted (crosses) as well as marine fish from the Adriatic⁸ (a). Correlation between δ¹³C (‰) and δ¹⁵N (‰) and distance to the coast (km) is explored in (b) and (c), respectively. The grey bands represent the 95% confidence interval bands. Data plotted comes from this study and from^1,8,44,45.