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. 2019 Dec 11;9:18781. doi: 10.1038/s41598-019-54869-6

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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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𝛿¹³C and 𝛿¹⁵N stable isotope measurements for Darwin’s finch species. Point color and point shape indicate host species and habitat, respectively. (A) Individual 𝛿¹³C and 𝛿¹⁵N values for each finch with gut microbiome samples. (B) Mean 𝛿¹³C and 𝛿¹⁵N values for each species and habitat with standard deviation. The small ground finch (SGF) is the only species with multiple samples per habitat and has distinct 𝛿¹³C and 𝛿¹⁵N values dependent on the habitat of origin.