Fig. 3: Coral metabolic rates, calcifying fluid carbonate chemistry and calcification rates.
Changes in (a, b) net photosynthesis and dark respiration rates, (c, d) calcifying fluid dissolved inorganic carbon (DICcf), (e, f) calcifying fluid pH (pHcf), (g, h) calcifying fluid carbonate ion concentration ([CO32-]cf), and (i, j) calcification rates for the coral Acropora nasuta. Values shown are mean ± SE. On the left is experiment 1 during summer (stripes) and winter (no stripes) for the three treatments with seasonally variable temperature and/or light, and the control treatment (grey). On the right is experiment 2 showing each of the eight temperature and light treatments at the end of the experiment. Treatment conditions for experiment 1 are the following: constant light and constant temperature (CLCT), seasonal light and constant temperature (SLCT), constant light and seasonal temperature (CLST), and seasonal light and seasonal temperature; (SLST). Treatment conditions for experiment 2 consist of high (28H, 27H, 24.5H, and 22H) and low (28 L, 27 L, 24.5 L, 22 L) light diurnal PAR cycles at each of the four temperatures (28 °C, 27 °C, 24.5 °C, and 22 °C).
