Table 6.
Potential nitrification rate (PNR) (μmol N m−2 d−1) and abundance of amoA (of β-AOB and AOA) and their transcripts in the microbial mats during the 2010–2011 sampling period (copies g−1 sediment).
| July | September | November | January | April | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| SD | SD | SD | SD | SD | ||||||
| STATION 1 | ||||||||||
| PNR | n.d. | 43.5 | 15.6 | 463.7 | 103.7 | 356.9 | 86.3 | 248.7 | 27.0 | |
| AOB DNA | 550 | 100 | n.d. | 99 | 3.4 × 105 | 5.9 × 104 | n.d. | |||
| AOB cDNA | 86 | 150 | 2.0 × 103 | 1.7 × 103 | n.d. | 290 | 510 | 970 | 390 | |
| AOA DNA | n.d. | n.d. | n.d. | n.d. | n.d. | |||||
| AOA cDNA | n.d. | n.d. | n.d. | n.d. | n.d. | |||||
| STATION 2 | ||||||||||
| PNR | 102.8 | 23.6 | 33.6 | 12.8 | 274.9 | 17.8 | 327.8 | 96.4 | 97.5 | 55.4 |
| AOB DNA | 8.2 × 106 | 5.8 × 106 | 2.3 × 105 | 1.2 × 105 | 1.4 × 105 | 5.6 × 104 | 1.7 × 107 | 6.2 × 106 | 1.8 × 106 | 8.5 × 105 |
| AOB cDNA | n.d. | 360 | 250 | 3.9 × 103 | 2.2 × 103 | n.d. | n.d. | |||
| AOA DNA | 460 | 390 | 210 | 66 | 150 | 340 | 1.0 × 104 | 4.6 × 103 | 5.9 × 103 | 55 |
| AOA cDNA | n.d. | n.d. | n.d. | n.d. | n.d. | |||||
| STATION 3 | ||||||||||
| PNR | 177.4 | 15.2 | 57.5 | 31.7 | 300.3 | 56.8 | 537.0 | 99.2 | 237.7 | 86.4 |
| AOB DNA | 1.1 × 105 | 2.6 × 104 | 5.4 × 105 | 3.3 × 105 | 3.8 × 106 | 1.2 × 106 | 4.9 × 106 | 1.9 × 106 | 8.9 × 103 | 2.5 × 103 |
| AOB cDNA | n.d. | 830 | 140 | 3.5 × 103 | 2.1 × 103 | 1.6 × 103 | 830 | 1.4 × 103 | 180 | |
| AOA DNA | 330 | 2.2 × 103 | 4.3 × 103 | 2.8 × 103 | 110 | 47 | 1.7 × 103 | 800 | n.d. | |
| AOA cDNA | n.d. | n.d. | n.d. | n.d. | n.d. | |||||
SD, standard deviation; n.d., below detection.