Table 2. Identity of the 5 most abundant OTUs (based on 16S rRNA sequences) for each valley following the lowest taxonomic level of the SILVA modified database52.
| Number of reads | OTU | Valley | SILVA taxonomy | % identity | Accession number | Genbank taxonomy | Isolation source |
|---|---|---|---|---|---|---|---|
| 68710 | 1 | KWK (22%) | Methanoregula | 100 | GU224062 | uncultured archaeon | lake water |
| BGR (14%) | |||||||
| SAS (11%) | |||||||
| 44091 | 2 | SAS (12%) | Methanosaeta | 100 | LN626810 | uncultured archaeon | Marine bioreactor |
| KWK (8%) | |||||||
| BGR (6%) | |||||||
| 24882 | 1324 | KWK (8%) | Methanoregula | 99 | JN397914 | uncultured archaeon | spring pit |
| SAS (3%) | |||||||
| 22248 | 7 | KWK (10%) | MEG | 97 | GU127467 | uncultured archaeon | reservoir anoxic water |
| BGR (9%) | |||||||
| 20494 | 111 | BGR (14%) | MEG | 98 | AY294414 | uncultured archaeon | hydrocarbon-contaminated aquifer |
| 19308 | 362 | SAS (4%) | Methanoregula | 98 | KJ955705 | uncultured Methanoregula | hydrocarbon-contaminated sediment |
| 17934 | 9 | BGR (8%) | Euryarchaeota | 90 | AB019748 | uncultured archaeon | deep-sea hydrothermal vent |
| 10585 | 1255 | SAS (3%) | Methanoregula | 98 | JF304133 | uncultured archaeon | outfall sediment |
| 9430 | 11 | KWK (6%) | Thermoplasmatales | 93 | EU910624 | uncultured euryarchaeote | sediment |
OTU refers to the taxon identity numbers in Fig. 3. The groups Euryarchaeota, Miscellaneous Euryarchaeotic Group (MEG) and Thermoplasmatales could not be further assigned. Percent (%) is the proportion of each OTU expressed as a percentage of the total 16S rRNA reads for the archaeal communities in each valley.