Table 1 Environmental and bacterial parameters in three groups from the two Southern Ocean stations.

From: Bacterioplankton community shifts associated with epipelagic and mesopelagic waters in the Southern Ocean

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

  1. Analysis of variance (ANOVA) was used in combination with Scheffe’s F multiple-comparison test to examine differences among the parameters of the three groups. Different lower case letters indicate significant differences among the groups.
  2. Data represent mean ± SE.