Fig. 3. Maximal photosynthetic quantum yields (F_v/F_m, mean ± 95% confidence limits) of (A) dinoflagellates, (B) exposed endoliths and (C) endoliths under intact tissue. Each was examined under four combinations of temperature and light in the beginning of the experiment (red open squares) and 24 h later (green filled squares). In C (under intact tissue) only the endpoint F_v/F_m could be measured, after removal of coral tissue (red-filled squares).