Figure 3. Average calcification rates for S. siderea corals reared under the control and elevated pCO₂ ppm-v conditions for the 0–30 and 30–60 day observational intervals in four crossed temperature-pCO₂ treatments (426 ppm-v/28.1 °C; 424 ppm-v/31.9 °C; 888 ppm-v/28.0 °C; 940 ppm-v/31.8 °C).

Mixed effects modelling reveals that temperature only is a significant predictor of calcification rate across the 0–30 d observational interval, while both temperature and pCO₂ are significant predictors across the 30–60 d and 0–60 d intervals. Bars show standard error.