Table 3.
Comparison of population changes of total methanogens and select bacteria
| Microbe(s) or methanogen | Mean population (16S rRNA gene copies/ml culture)a with: |
SEM | P value | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| PA | EB | ETB | 2NEOH | NE | BES | SN | C | |||
| Total bacteria | 1.3 × 1010 c | 4.6 × 1010 a | 2.5 × 1010 a,b | 2.1 × 1010 a,b | 1.8 × 1010 a,b | 4.1 × 1010 a,b | 1.9 × 1010 a,b | 1.7 × 1010 a,b | 6.2 × 109 | 0.0137 |
| F. succinogenes | 1.5 × 105 c | 3.8 × 104 c | 3.2 × 104 c | 3.3 × 105 c | 1.6 × 106 b | 1.4 × 105 c | 1.4 × 104 c | 8.2 × 106 a | 9.6 × 104 | <0.0001 |
| R. flavefaciens | 2.0 × 106 b | 7.5 × 105 c | 2.7 × 105 c | 5.2 × 106 a | 4.5 × 105 c | 1.4 × 105 c | 2.2 × 104 c | 6.3 × 105 c | 1.7 × 105 | <0.0001 |
| R. albus | 3.1 × 105 b | 3.1 × 105 b | 1.8 × 105 b | 1.4 × 106 a | 3.4 × 105 b | 1.3 × 105 b | NDb | 2.0 × 105 b | 7.5 × 104 | <0.0001 |
| Methanogen | 1.6 × 107 b | 4.0 × 106 b,c | 3.6 × 106 b,c | 4.0 × 106 b,c | 4.8 × 106 b,c | 2.2 × 106 b,c | 9.4 × 104 c | 6.9 × 107 a | 2.9 × 106 | <0.0001 |
a
Means within rows with different letters differ significantly (P < 0.05).
b
ND, not detected.