Table 2. Significant OTUs discriminating between enrichment and natural samples.
| OTU | Identity | Δa | Contrib. (%)b | Natural Samples (%)c | Enrichment Samples (%)d |
| C529 | Thermotoga sp. | + | 10.76 | 0.04 | 19.25 |
| C603 | GAL35 | − | 10.36 | 21.89 | 3.47 |
| C056 | “Aigarchaeota” | − | 9.18 | 16.67 | 0.28 |
| C199 | Aeropyrum sp. | − | 6.22 | 11.61 | 0.51 |
| C359 | Ignisphaera-like | + | 6.08 | 0.00 | 10.84 |
| C782 | Thermotoga sp. | + | 5.81 | 0.10 | 10.41 |
| C136 | NAG1 | − | 3.97 | 7.10 | 0.06 |
| C903 | Archaeoglobus sp. | + | 3.95 | 0.65 | 7.70 |
| C692 | Dictyoglomus sp. | + | 3.66 | 0.13 | 6.61 |
| C487 | “Aigarchaeota” | − | 3.62 | 6.46 | 0.42 |
a
Difference between natural sediment and enrichment populations. +, OTU has greater representation in enrichment samples than natural samples. −, OTU has lower representation in enrichment samples than natural samples.
b
Percent contribution to community composition difference.
c
Average percent representation in natural sediment communities.
d
Average percent representation in enrichment sample communities.