Table 1.
Key characteristics of Trichodesmium cultures used in the experiment (mean ± SD)
| pH in culture medium | 8.52 ± 0.06 | n = 7 | |
| pH in abiotic reference medium | 8.38 ± 0.06 | n = 9 | |
| Phosphate uptake (replicate 1) | μmol l−1 d−1 | 0.08 | |
| Phosphate uptake (replicate 2) | μmol l−1 d−1 | 0.12 | |
| Fv/Fm a | 0.46 ± 0.07 | n = 9 | |
| POC : PON (7 h)b | mol mol−1 | 5.5 ± 1.2 | n = 4 |
| POC : PON (12 h)c | mol mol−1 | 8.3 ± 2.6 | n = 28 |
| POC : POPb | mol mol−1 | 100 ± 75 | n = 4 |
| PON : POPb | mol mol−1 | 20 ± 16 | n = 4 |
| POC : chlorophyll a b | μg μg−1 | 256 ± 116 | n = 3 |
Fv/Fm, photochemical quantum yield; POC, particulate organic carbon; PON, particulate organic nitrogen; POP, particulate organic phosphorus.
a
Measured along transects across individual colonies.
b
Bulk culture samples taken 7 h after beginning of the photoperiod.
c
Samples taken at the end of the photoperiod, average value including colonies and single trichomes incubated under different O2 concentrations.