Fig. 6
Photosynthesis-to-respiration (P/R) ratios and calcification rate at the end of the heat stress test. Acropora aspera corals were maintained under a, c constant daily temperatures or b, d 4 °C daily temperature variability. The heat stress test followed long-term exposure to three different temperature regimes. Mean ± 1 S.E.M. is shown. Grey circles indicate individual data points. Asterisks indicate a significant difference between ambient and heat-stressed corals at each temperature and variability regime (p < 0.05; Tukey post hoc tests). The dotted line in a, b represents the transition from net autotrophy (P/R > 1) to net heterotrophy (P/R < 1). Source data are provided as a Source Data file
