Table 1. Irradiance and seawater physico-chemical parameters during the incubations.
| Vulcano (Italy) | Ria Formosa (Portugal) | ||
|---|---|---|---|
| Irradiance (μmol quanta m−2 s−1) | Midday: 1137 ± 65 | 517–1326 | |
| Afternoon: 539 ± 107 | |||
| Reference site | CO2 site | ||
| S | 37.5 ± 0.0 | 37.5 ± 0.0 | 36.3 ± 0.3 |
| T (°C) | 19.8 ± 0.5 | 20.3 ± 1.0 (20.2 ± 0.8) | 25.7 ± 1.6 |
| pH (NBS) | 8.179 ± 0.058 | 7.985 ± 0.088 (7.896 ± 0.193) | 7.706–8.387 |
| TA (μmol · kg SW−1) | 2545 ± 7 | 2577 ± 1 (2579 ± 12) | 2466 ± 77 |
| DIC (μmol · kg SW−1) | 2244 ± 40 | 2377 ± 37 (2417 ± 86) | 2018–2373 |
| pCO2 (μatm) | 427 ± 68 | 737 ± 158 (1004 ± 549) | 245–1465 |
| CO2 (μmol · kg SW−1) | 14 ± 2 | 23 ± 6 (32 ± 17) | 7–38 |
| HCO3− (μmol · kg SW−1) | 2012 ± 61 | 2197 ± 63 (2250 ± 117) | 1685–2227 |
| CO32− (μmol · kg SW−1) | 218 ± 23 | 156 ± 32 (136 ± 49) | 98–359 |
Data are mean ± sd or min–max values recorded in the water. Irradiance was measured 0.5 m above the incubation chambers. Data in parenthesis include one extreme high value recorded in the CO2 site in Vulcano.