Figure 2

Coral photosynthetic performances throughout the experiment. (a) Average nubbins maximum photosynthetic efficiency (Fv/Fm) in each treatment: Control (blue) and Stress (red). Error bars represent standard deviation. Asterisks indicate significant differences between treatments (Bonferroni corrections, *p < 0.005, **p < 1e-11, ***p < 1e-22). (b) Temperature profiles of the 4 tanks: Stress (1,4, orange and red), Control (2–3, pale and dark blue). Dashed vertical lines indicate time points where the temperature was increased to MMM +2 and MMM +4.