TABLE 2.
Fluxes of oxygen and calcium (mean ± standard error; n = 2) and pH changes at biofilm surfaces measured in samples from Deinschwanger Bach at different temperaturesa
| Experimental temp | Flux (mol m−2 s−1)
|
ΔpH
|
||||
|---|---|---|---|---|---|---|
| O2
|
Ca2+
|
Light | Dark | |||
| Light | Dark | Light | Dark | |||
| 4°C | 2.8 × 10−6 ± 1.6 × 10−7* | −3.7 × 10−7 ± 6.6 × 10−8* | −2.0 × 10−6 ± 2.4 × 10−7* | 0* | 1.3 | 0 |
| 10°C | 3.0 × 10−6 ± 6.2 × 10−7* | NA | −3.5 × 10−6 ± 1.3 × 10−6* | 2.0 × 10−7 ± 6.7 × 10−8** | 1.0 | −0.3 |
| 17°C | 1.0 × 10−5 ± 8.7 × 10−7** | −1.0 × 10−6 ± 2.5 × 10−8** | −4.1 × 10−6 ± 3.9 × 10−7* | 2.9 × 10−7 ± 5.0 × 10−10** | 1.3 | −0.3 |
a
For fluxes, positive values indicate flux from the biofilm to the water column, and negative values indicate the opposite. NA indicates that no profile was obtained. Values with the same number of asterisks (within each chemical and light phase) were not significantly different (P > 0.05).