Table 3.
Sediment total O2 uptake and O2 penetration depth. Average ± 1 s.d. (n) Initial and final light/dark differences in the total O2 uptake (∆TOU = TOUdark − TOUlight, µmol m−2 h−1) of estuarine sand and subtidal silt in Control and Treatment seawater. Pore water oxygenation (O2 penetration depth, OPD, mm) in light and dark are given for the subtidal silt in Control and Treatment seawater. Number of replicate measurements are given in parentheses and note that the OPD was estimated from repeated (initial, final) measurements of replicate O2 microprofiles in one Control and one Treatment core.
| Estuarine sand | Subtidal silt | |||||||
|---|---|---|---|---|---|---|---|---|
| Control | Treatment | Control | Treatment | |||||
| Initial | Final | Initial | Final | Initial | Final | Initial | Final | |
| ∆TOU | −46 ± 265 (4) | 351 ± 100 (5) | 245 ± 435 (5) | 845 ± 82 (5) | 308 ± 187 (4) | 763 ± 98 (5) | 171 ± 174 (5) | 1438 ± 318 (5) |
| OPDlight | — | — | — | — | 7.6 ± 0.7 (10) | 7.2 ± 0.3 (10) | 6.3 ± 0.9 (10) | 9.4 ± 0.4 (10) |
| OPDdark | — | — | — | — | 5.2 ± 0.3 (10) | 4.0 ± 0.3 (10) | 4.7 ± 0.6 (10) | 4.2 ± 0.3 (10) |