Figure 6. Box-plots representing the 25^th, 50^th and 75^th percentiles of ΔH⁺, calculated from profiles measured during the pCO₂ treatment incubation, at light (30 µmol photons m⁻² s⁻¹) and dark conditions for individual species.

Note the different scales between A) photosymbiotic and B) symbiont-free species. Outliers (>1.5 interquartile range) and extreme values (>3 times interquartile range) are indicated by (O) and (*) respectively.