Table 1. Influence of dFe concentrations in the cultures on surface∶volume ratio, elemental ratios, cellular and volume-normalized N2 and CO2 fixation rates of C. watsonii WH8501 (numbers in brackets represent standard deviation).
| Media dFe (nM) | 3.3 | 5.3 | 8.3 | 13.3 | 23.3 | 43.3 | 103.3 | 403.3 |
| Surface∶volume | 3.1 | ND | ND | 2.9 | ND | 2.9 | ND | 2.4 |
| (µm2∶µm3) | (0.2) | (0.2) | (0.1) | (0.3) | ||||
| C∶N ratios | 8.3 | 8.9 | 8.8 | 10.2 | 9.5 | 8.3 | 8.0 | 9.6 |
| (mol∶mol) | (0.5) | (0.3) | (0.6) | (0.4) | (0.9) | (0.3) | (0.8) | (0.5) |
| Chl a∶C ratios | 51.1 | 41.0 | 34.1 | 36.6 | 54.7 | 63.6 | 66.5 | 58.1 |
| (µmol∶mol) | (8.5) | (3.6) | (7.7) | (4.2) | (6.6) | (6.8) | (8.4) | (5.3) |
| N2 fixation | 7.2 | ND | ND | ND | ND | 53.2 | ND | 65.6 |
| (amol N.µm−3.h−1) | (1.2) | (7.3) | (22.2) | |||||
| CO2 fixation | 1.2 | ND | ND | 3.1 | ND | 3.5 | ND | 3.9 |
| (fmol C.µm−3.h−1) | (0.2) | (0.6) | (0.5) | (1.3) |
ND : No data.