Table 3. Rates of acetylene reduction to ethylene by Beggiatoa-dominated biofilms and sulfidic sediment collected at the cave site Pozzo dei Cristalli (PC) within the Frasassi caves.
| Sample |
Ethylene (nmol g−1 h−1)a |
|
|---|---|---|
| February 2011b | May 2011b | |
| Beggiatoa-dominated biofilm | PC-BeggB | PC-BeggC |
| Only biofilm | 3.94±0.24 | 7.18±0.61 |
| +Molybdate | NM | 0.72±0.03 |
| Sulfidic sediment | PC-SedA | PC-SedC |
| Only sediment | 3.27±0.11 | 4.40±0.37 |
| +Molybdate | NM | 4.64±0.34 |
Abbreviation: NM, not measured.
a
Values over an interval of 1 h and 2 h were considered for biofilm and sediment, respectively.
b
Analyzed with two and three replicates for samples collected in February and May, respectively.