TABLE 2.
Vertical profile of some bacterial subgroup abundances through the epi- and mesopelagic zones in the northwest Atlantic Ocean during cruise COCA-2, at station 32, 26.00°N, 26.00°Wa
| Depth (m) | Chl concn (mg m−3) | TPA (no. of cells [105] ml−1) | % HNA cells | PHP (μg carbon liter−1 day−1) | SGR (day−1) | No. of CTC+ cells (104) ml−1 | No. of “live” cells (105) ml−1 | % CTC+ cells | % “Live” cells |
|---|---|---|---|---|---|---|---|---|---|
| 5 | 0.04 | 6.68 | 38.6 | 6.32 ± 0.65 | 0.398 | 4.79 | 4.61 | 7.2 | 69.6 |
| 50 | 0.05 | 6.76 | 37.2 | 6.18 ± 0.73 | 0.383 | 2.32 | 3.4 | ||
| 100 | 0.15 | 4.14 | 26.6 | 4.09 ± 0.39 | 0.416 | 2.38 | 4.06 | 5.7 | 61.0 |
| 120 | 0.25 | 5.24 | 24.2 | 1.99 ± 0.16 | 0.181 | 6.22 | 3.94 | 11.9 | 63.4 |
| 130 | 0.65 | 6.79 | 34.8 | 10.99 ± 1.42 | 0.580 | 6.59 | 4.41 | 9.7 | 46.0 |
| 150 | 0.45 | 6.11 | 53.0 | 21.22 ± 1.11 | 0.954 | 2.58 | 3.93 | 4.2 | 46.5 |
| 200 | 0.04 | 2.85 | 51.4 | 0.94 ± 0.04 | 0.158 | 1.05 | 2.59 | 3.7 | 49.6 |
| 300 | <0.01 | 2.41 | 52.6 | 0.26 ± 0.05 | 0.053 | 1.04 | 1.49 | 4.3 | 44.0 |
| 400 | <0.01 | 2.20 | 54.1 | 0.15 ± 0.03 | 0.034 | 0.98 | 44.7 | ||
| 500 | <0.01 | 2.38 | 50.4 | 0.19 ± 0.04 | 0.040 | 0.68 | 28.5 | ||
| 600 | <0.01 | 2.36 | 57.9 | 0.21 ± 0.07 | 0.042 | 0.83 | 0.46 | 3.5 | 31.4 |
| 700 | <0.01 | 2.06 | 49.5 | 0.11 ± 0.04 | 0.026 | 0.69 | 42.4 | ||
| 800 | <0.01 | 1.86 | 54.9 | 0.06 ± 0.01 | 0.015 | 0.30 | 21.9 | ||
| 900 | <0.01 | 1.88 | 47.7 | 0.11 ± 0.01 | 0.030 | ||||
| 1,000 | <0.01 | 2.41 | 38.6 | 0.05 ± 0.02 | 0.011 | 0.57 | 0.24 | 2.4 | 21.1 |
a
Prokaryote heterotrophic production (PHP) is the average of leucine and thymidine incorporation values converted with empirically derived conversion factors. Chl, chlorophyll; TPA, total prokaryote abundance determined by SG1 staining; SGR, heterotrophic prokaryote specific growth rate.