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Physiological changes in corals X. umbellata and P. flava at the end of the experiment. (a) Phenotypes of corals X. umbellata and P. flava before and after the experiment. (b) Seawater inorganic nutrient levels in all aquaria at the end of the experiment. (c) Elemental (carbon and nitrogen) changes in both coral holobionts. Values are means ± SD, and the asterisk indicates statistically significant differences (*P < 0.05, **P < 0.01).
