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. 2020 Oct 1;10:16276. doi: 10.1038/s41598-020-73283-x

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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 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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Halimeda tuna δ¹⁸O and δ¹³C. Isotopic analysis from Halimeda tuna samples collected at the Benthic Oceanographic Array node locations (see Fig. 1) and interpolated onto the reef bathymetry. Depth contours, scale and orientation are the same for all subfigures. (A,B) The inorganic δ¹³Cin and organic δ¹³Corg carbon component relative to Vienna Peedee belemnite. (C) δ¹⁸O relative to SMOW. (D) Benthic sample depth vs isotopic component values from A–C. The δ¹³Cin, δ¹³Corg and δ¹⁸O components are shown by the black, blue and green markers respectively.