TABLE 2.
CO2 fixation and oxidation/reduction rates after 48 and 72 hours of incubation with different electron donator/electron acceptor combinations
| Mean (μmol liter−1)c
| |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Station and electron donor/electron acceptor | CO2 fixation
|
Oxidation of electron donor
|
Reduction of electron acceptor
|
||||||
| 0-48 h | 48-72 h | Daily rate | 0-48 h | 48-72 h | Daily rate | 0-48 h | 48-72 h | Daily rate | |
| Station 271 | |||||||||
| Methanol/Fe(III) | 0.14 (0.04) | −0.05 (0.00) | 0.03 | NDa | ND | ND | −9.1 (4.3) | 9.4 (42.3) | 0.1 |
| Fe(II)/Mn(IV) | 0.15 (0.05) | −0.10 (0.06) | 0.02 | 17.8 (4.3) | 12.4 (1.6) | 10.1 | 30.6 (0.9) | 19.7 (4.5) | 16.8 |
| NH4+/Fe(III) | 0.33 (0.33) | −0.28 (0.03) | 0.02 | −53.7 (11.8) | 68.0 (14.3) | 7.2 | ND | ND | ND |
| Na2S2O3/Fe(III) | 2.08 (0.03) | 5.65 (0.56) | 2.58 | ND | ND | ND | 1.1 (0.9) | −9.1 (1.2) | −2.7 |
| Na2S2O3/none | 2.43 (0.04) | 8.91 (0.20) | 3.78 | ND | ND | ND | NDb | ND | ND |
| Na2S2O3/Mn(IV) | 2.45 (0.01) | 1.68 (0.09) | 1.38 | ND | ND | ND | 11.3 (1.3) | −11.3 (0.0) | 0.0 |
| Glucose/Mn(IV) | 0.15 (0.11) | 0.84 (0.01) | 0.33 | ND | ND | ND | −0.7 (8.1) | −1.2 (2.2) | −0.6 |
| Glucose/Fe(III) | 0.16 (0.06) | 0.70 (0.29) | 0.29 | ND | ND | ND | −6.9 | 4.4 (2.8) | −0.8 |
| Station 284 | |||||||||
| Na2S2O3/NO3− | 4.93 (0.25) | 9.68 (0.41) | 4.87 | ND | ND | ND | 27.2 (7.3) | 33.5 (9.0) | 20.2 |
| Na2S/NO3− | 0.93 (0.64) | −0.21 (0.17) | 0.24 | 42.4 (11.2) | −19.7 (5.1) | 7.6 | ND | ND | ND |
| NH4+/NO3− | 0.04 (0.01) | 0.10 (0.09) | 0.05 | 4.9 (0.7) | −35.6 (4.8) | −10.2 | ND | ND | ND |
| Methanol/NO3− | 0.06 (0.01) | 0.02 (0.01) | 0.03 | ND | ND | ND | 21.0 (8.2) | −18.7 (7.3) | 0.8 |
| Mn(II)/NO3− | 0.07 (0.00) | 0.00 (0.00) | 0.02 | −3.4 (4.8) | 3.4 (0.0) | 0.0 | ND | ND | ND |
| Glucose/NO3− | 0.17 (0.09) | 0.22 (0.03) | 0.13 | ND | ND | ND | −10.7 (2.9) | 8.3 (2.2) | −0.8 |
a
ND, not determined.
b
0.01 ml liter−1 H2S detected.
c
Values in parentheses are standard deviations in micromoles per liter.