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. 2021 Jun 15;11:12594. doi: 10.1038/s41598-021-91927-4

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© The Author(s) 2021

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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(A) Principal component analysis (PCA) using normalized δ¹³C values of essential amino acids (δ¹³C_EAA) in surface sediments (yellow), gut contents (red) and body tissue (blue) of O. mutabilis (filled symbols), E. rostrata (open symbols), and body tissue of S. globosa (circled cross). Ellipses outline the 95% confidence region around the mean (large symbols) for each group. (B) Linear Discriminant Analysis (LDA) based on a training set built with δ¹³C_EAA values of surface sediments (yellow) and gut contents (red). Body tissue samples (blue) were collected in the period of low food supply (i.e. May; squares) and in the period of high food supply (i.e. October; triangles).