Fig. 4.

Physiological response of bleaching-resistant and bleaching-susceptible corals over time. (A) Host total tissue biomass (ash-free dry weight), (B) host soluble protein density, (C) host lipid density, (D) calcium carbonate (CaCO₃) density, (E) endosymbiont cell density, (F) chlorophyll-a concentration, (G) host total antioxidant capacity (TAC), (H) host melanin content, (I) host prophenoloxidase (PPO) activity, (J) maximum photosynthetic rates, (K) light-enhanced dark respiration rates, and (L) photosynthesis to respiration ratios (P:R) for bleaching-susceptible and bleaching-resistant M. capitata and P. compressa. Points and error represent the mean ± SE (n = 4 to 10). The gray shading indicates seasonal peak temperatures (i.e., September–October), with a dashed red rectangle representing the 2019 marine heatwave.