Table 3.
Observed (AOB 16S rRNA gene clone libraries and DGGE) and estimated AOB species richness
| Reactors | ||||
|---|---|---|---|---|
| R1-LNHO | R2-LNLO | R3-HNHO | R4-HNLO | |
| Number of OTUsa | 8 | 11 | 6 | 7 |
| Chao1 (standard error) | 9 (3.4) | 14 (11.7) | 6.5 (3.7) | 7.3 (1.9) |
| ACE (standard error)b | 10.7 (1.5) | 15.14 (2) | 7.6 (1.2) | 8.4 (1.4) |
| Number of bands (standard deviation)c | 9 (1.5) | 7 (0.8) | 11.75 (0.5) | 5.5 (0.6) |
a
Number of OTUs observed in the AOB 16S rRNA gene clone libraries without considering the non-AOB OTUs.
b
Abundance-based coverage estimation (ACE).
c
Mean values of the number of bands detected in the DGGE profiles of the samples collected the last four sampling days (46, 55, 64, 73) in each reactor.