Fig. 1. (A) Zooxanthellae density and (B) chlorophyll content, measured for corals either maintained at 18°C under the three light intensities, 30, 80 and 250 µmol m^–2 s^–1 (18°C/30; 18°C/80; 18°C/250) or at 14°C and 30 µmol m^–2 s^–1 (14°C/30) and 23°C and 250 µmol m^–2 s^–1 (23°C/250). Data are presented as mean ± s.e.m. (N=10). Chlorophyll a and c₂ are shown separately but analysed as chl a+c₂. Means with different letters (a, b) are significantly different (P<0.05).