TABLE 2.
Chemical composition of PW, total cell counts, and gene copy numbers of 16S rRNA and dsrAB
| Parameter | Result for field: |
|
|---|---|---|
| Dan | Halfdan | |
| PW composition (mg liter−1)a | ||
| Chlorideb | 33,747 (952) | 38,652 (1,090) |
| Sulfateb | 1,174 (12.2) | 1,175 (12.3) |
| Sulfide | 5 (0.2) | 0.1 (0.003) |
| Ammoniumc | 33 (1.8) | 51 (2.83) |
| Nitratec | <0.5 (<0.01) | |
| Nitritec | <0.5 (<0.01) | |
| Acetate | 282 (4.7) | 340 (5.7) |
| Propionate | 46 (0.6) | 60 (0.8) |
| Butyrate | 3 (0.03) | <2 (<0.02) |
| DAPI countsd | 1.2 × 105-2.0 × 105 | 0.03 × 106-4.3 × 106 |
| Gene copy no./ml PW | ||
| Bacterial 16S rRNA | 1.95 × 104 ± 0.55 × 104 | 0.83 × 106 ± 0.10 × 106 |
| Archaeal 16S rRNA | 2.66 × 104 ± 0.62 × 104 | 0.28 × 106 ± 0.05 × 106 |
| Bacterial dsrA | 1.95 × 102 ± 1.1 × 102 | 3.12 × 103 ± 0.77 × 103 |
| Archaeal dsrB | 0.66 × 104 ± 0.37 × 104 | 3.19 × 104 ± 0.45 × 104 |
| Sum of bacterial and archaeal dsrAB | 0.68 × 104 ± 0.38 × 104 | 3.50 × 104 ± 0.51 × 104 |
a
All values are given in mg liter−1. Millimolar concentrations are given in parentheses. Data were provided by Maersk Oil (Copenhagen, Denmark) and are average values from several samplings.
b
Chloride and sulfate are routinely monitored to control seawater breakthrough.
c
Ammonium, nitrate, and nitrate are not routinely analyzed at Dan, as no nitrate is added to the injection water.
d
Range of DAPI counts from Dan and Halfdan PW (data provided by Maersk Oil).