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. 2024 Mar 5;14:3369. doi: 10.1038/s41598-024-53294-8

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© The Author(s) 2024

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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Principal component analysis (PCA) of nitrate and ammonium treatments. Dotted and solid circles in score plots indicate 95% and 99% confidence intervals for all plots, respectively. Colored circles indicate 95% confidence intervals for each group; (A) primary polyps without zooxanthellae; (B) primary polyps with zooxanthellae. PC1, first principal component; PC2, second principal component; apo, sym, without and with zooxanthellae, respectively; NaNO₃, nitrate treatment; NH₄Cl, ammonium treatment; ctrl, control.