Table 1.

Minimum pH and mean pH in a 1.96 × 1.96 mm region of interest (ROI) centred on the point of minimum pH. Mean ± 95% confidence intervals. Seawater pH was 8.2.

timeminimum pHmean pH within ROI
daytime (n = 9)5.36 ± 0.686.12 ± 0.19
nighttime (n = 9)4.65 ± 1.26.05 ± 0.31