Table 2.

Gross photosynthetic rates (μmol O₂ g⁻¹ s⁻¹) measured at 14.00, on four days during the experiment. S indicates static pH treatments, while F indicates fluctuating pH treatments. n = 6, mean ± s.e.

time	day 1	day 10	day 30	day 40
pH 8.05 S	0.04 ± 0.01	0.07 ± 0.01	0.09 ± 0.02	0.05 ± 0.02
pH 8.05 F	0.03 ± 0.01	0.02 ± 0.02	0.05 ± 0.01	0.03 ± 0.01
pH 7.65 S	0.04 ± 0.01	0.04 ± 0.01	0.05 ± 0.01	0.04 ± 0.02
pH 7.65 F	0.04 ± 0.01	0.02 ± 0.01	0.05 ± 0.01	0.03 ± 0.01