Table 1. Average physicochemical conditions in samples taken from Monterey Bay surface waters during April and June 2011.
| Temperature† (oC) | Salinity | Chl a (μg l−1) | NH4+ (μM) | NO2− (μM) | NO3− (μM) | SiO44− (μM) | PO43− (μM) | O2 (ml l−1) | 15NH4+oxidation (nmol l−1 day−1) | |
|---|---|---|---|---|---|---|---|---|---|---|
| April | ||||||||||
| Mean | 11.0a | 33.6a | 12.6a | 0.15a | 0.15a | 10.0 | 10.8 | 1.2 | 5.9 | 23.5 |
| s.d. | 1.1 | 0.2 | 8.2 | 0.13 | 0.09 | 10.3 | 11.2 | 0.7 | 2.0 | 21.9 |
| N | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 27 |
| June | ||||||||||
| June | ||||||||||
| Mean | 11.9b | 33.7b | 4.8b | 1.0b | 0.37b | 12.6 | 14.6 | 1.4 | 5.4 | 14.8 |
| s.d. | 1.2 | 0.1 | 3.4 | 0.79 | 0.15 | 6.8 | 7.4 | 0.5 | 1.5 | 15.1 |
| N | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 14 |
†
Different letters between April and June denote significantly different means (α=0.05), within a variable; when letters are absent, no statistical difference between means was found.