Table 1 Environmental and bacterial parameters in three groups from the two Southern Ocean stations.
Water layer | Group 1 (n = 5) | Group 2 (n = 4) | Group 3 (n = 4) |
|---|---|---|---|
Temperature (°C) | 0.52 ± 0.01a | 0.12 ± 0.23a | −0.59 ± 0.22b |
Salinity (‰) | 34.30 ± 0.01a | 34.28 ± 0.01a | 34.47 ± 0.06b |
Dissolved oxygen (mg l−1) | 7.97 ± 0.01a | 8.06 ± 0.05ab | 8.20 ± 0.05b |
Electrical conductivity (S m−1) | 2.90 ± 0.01a | 2.86 ± 0.02ab | 2.82 ± 0.03b |
Shannon-Wiener index | 4.21 ± 0.06a | 4.35 ± 0.11a | 4.94 ± 0.04b |
Number of OTUs | 1746 ± 83a | 1976 ± 101a | 2228 ± 76b |
Number of 16S rDNA (copy l−1) | (4.57 ± 2.25) × 1010a | (0.21 ± 0.14) × 1010a | (0.23 ± 0.10) × 1010a |
Proteobacteria (%) | 35.06 ± 2.61a | 58.70 ± 3.34b | 50.75 ± 3.69b |
Cyanobacteria (%) | 35.76 ± 4.24a | 8.50 ± 1.61b | 4.88 ± 2.37b |
Bacteroidetes (%) | 15.40 ± 3.25a | 18.33 ± 1.65a | 10.28 ± 1.48a |
Unclassified bacteria (%) | 11.88 ± 1.08a | 5.93 ± 1.07a | 25.13 ± 4.69b |