Table 1. Summary of pH imaging observations and calculated outward proton fluxes during chamber formation of A. tepida and H. depressa.
The average seawater pH at 100- to 110-μm distance from the foraminiferal shell is 8.16 pH units (n = 10). The values in bold represent the mean values of the five individuals. ND, not determined. Id, identification. Ind, individual.
| Species | Id. | Test size (μm) | Chamber size (μm) | pH microenvironment (seawater scale) | ΔpH | Local H+ flux (nmol/cm2/s) | Total H+ flux (pmol) | Time (hours) |
|---|---|---|---|---|---|---|---|---|
| A. tepida | Ind. 1 | 233 | 81 | 6.90 | 0.84 | 2.97 | ND | ND |
| Ind. 2 | 105 | 50 | 7.15 | 1.13 | 2.57 | 1940 | 5.33 | |
| Ind. 3 | 94 | 40 | 7.35 | 0.85 | 2.96 | 1447 | 5.40 | |
| Ind. 4 | 161 | 93.6 | 7.23 | 0.92 | 2.58 | 8364 | 6.56 | |
| Ind. 5 | 184 | 90.4 | 7.15 | 0.91 | 3.70 | 9661 | 5.65 | |
| Average | 155 | 71 | 7.16 | 0.93 | 2.96 | 5353 | 5.74 | |
| H. depressa | Ind. 1 | 193 | 81 | 8.07 | 0.20 | 0.07 | 598 | 24.00 |
| Ind. 2 | 141 | 89 | 8.05 | 0.24 | 0.22 | 1470 | 15.00 | |
| Ind. 3 | 134 | 89 | 7.95 | 0.31 | 0.18 | 1386 | 17.00 | |
| Ind. 4 | 209 | 102 | 8.01 | 0.25 | 0.13 | 1340 | 17.75 | |
| Ind. 5 | 251 | 125 | 7.83 | 0.30 | 0.11 | ND | ND | |
| Average | 186 | 97 | 7.98 | 0.26 | 0.14 | 1198 | 18.44 |