Fig. 4

Retrieved oxygen dynamics. (a–c) Gross photosynthesis to respiration (P_G:R) ratios across four temperatures for each species (M. capricornis, M. digitata and P. damicornis). The dashed lines indicate a value of 1, below which metabolic needs are no longer met from primary production. Box plots show mean as the horizontal line, and upper and lower quartiles, with whiskers indicating maximum and minimum values. n = 8 replicates were used per species at each temperature. (d) Average rETR values from three different species (M. capricornis, M. digitata and P. damicornis were assessed using Protocol 2 at 15, 26, 32 and 35 °C and 280 µmol photons m⁻² s⁻¹. Dotted lines indicate 3rd order polynomials. (e) Average respiration rates (R; µg O₂ cm⁻² h⁻¹) measured using Protocol 2 under 30 min of darkness across different temperatures. (f) Average rates of gross photosynthesis (P_G; µg O₂ cm⁻² h⁻¹) obtained using Protocol 2 under 30 min of 280 µmol photons m⁻² s⁻¹ of light across different temperatures. (g) The relationship between gross photosynthesis (P_G) and mean rETR for each species (n = 32). (h) The relationship between gross photosynthesis (P_G) to respirations rates (P_G:R) and mean rETR values at different temperatures for all three corals combined (r = 0.63, n = 96, P < 0.05). (i) The relationship between respiration (R) and gross photosynthesis (P_G) for all species across four different temperatures (n = 24).