Table 1.
Environmental factors and picoplankton and virioplankton abundances in the Caroline Seamount
| Epipelagic (0–200 m) | Mesopelagic (200–1,000 m) | Bathypelagic (1,000–3,000 m) | Water column (0–3,000 m) | |
|---|---|---|---|---|
| Temperature (°C) | 27.01 ± 4.93 | 9.77 ± 4.12 | 3.33 ± 1.33 | 20.07 ± 10.77 |
| Salinity | 34.25 ± 0.48 | 34.54 ± 0.10 | 34.60 ± 0.05 | 34.35 ± 0.41 |
| In situ Chl a fluorescence | 0.13 ± 0.16 | 0.10 ± 0.05 | 0.12 ± 0.04 | 0.12 ± 0.13 |
| NO2 − (µmol/L) | 0.07 ± 0.05 | 0.08 ± 0.05 | 0.10 ± 0.06 | 0.07 ± 0.05 |
| NO3 − (µmol/L) | 0.50 ± 0.94 | 6.70 ± 2.76 | 9.71 ± 0.55 | 3.19 ± 3.97 |
| NH4 + (µmol/L) | 4.22 ± 1.80 | 4.52 ± 1.58 | 4.42 ± 1.48 | 4.33 ± 1.73 |
| PO4 3− (µmol/L) | 0.09 ± 0.14 | 0.95 ± 0.38 | 1.34 ± 0.08 | 0.46 ± 0.54 |
| SYN (×103 cells/ml) | 0.61 ± 0.38 | 0.04 ± 0.04 | 0.04 ± 0.03 | 0.42 ± 0.41 |
| PRO (×103 cells/ml) | 20.35 ± 31.40 | 0.78 ± 1.64 | 0.16 ± 0.08 | 13.62 ± 27.32 |
| PEUK (×103 cells/ml) | 0.82 ± 0.51 | 0.04 ± 0.08 | 0.01 ± 0.01 | 0.55 ± 0.57 |
| HP (×105 cells/ml) | 4.97 ± 1.79 | 0.86 ± 0.36 | 0.29 ± 0.07 | 3.50 ± 2.54 |
| VLP (×106 particles/ml) | 7.23 ± 3.21 | 2.06 ± 0.98 | 1.30 ± 0.49 | 5.37 ± 3.75 |
| LFV (×106 particles/ml) | 3.12 ± 1.56 | 1.24 ± 0.63 | 1.02 ± 0.48 | 2.45 ± 1.62 |
| MFV (×106 particles/ml) | 3.29 ± 1.64 | 0.73 ± 0.42 | 0.26 ± 0.06 | 2.36 ± 1.90 |
| HFV (×106 particles/ml) | 0.81 ± 0.50 | 0.10 ± 0.08 | 0.03 ± 0.01 | 0.56 ± 0.54 |
| VPR | 15.88 ± 6.61 | 25.99 ± 10.92 | 45.49 ± 15.32 | 21.71 ± 13.64 |
Abbreviations: HFV, high fluorescence viruses; HP, heterotrophic prokaryotes; LFV, low fluorescence viruses; MFV, medium fluorescence viruses; PEUK, picoeukaryotes; PRO, Prochlorococcus; SYN, Synechococcus; VLP, virus‐like particles; VPR, virioplankton/prokaryote ratio.