Table 4 Topological properties of the co-occurrence networks of bacterial communities associated with rhizosheath root system (RS) and bulk sand (BS) in summer and winter seasons

Nodes (network size)

429

442

468

583

% of initial KTUs (> 0.01%)

73

75

61

63

Connectivity (total number of interactions)

958

1031

1654

810

N. Positive (% of total)

627 (65.4%)

730 (70.8%)

961 (58%)

397 (49%)

N. Negative (% of total)

331 (34.6%)

301 (29.2%)

693 (42%)

413 (51%)

Av. connectivity (av. interaction per node)*

4.47 a

4.66 a

7.1 b

2.78 c

Av. positive*

2.92 a

3.31 a

4.11 b

1.36 c

Av. negative*

1.54 a

1.36 a

2.96 b

1.41 a

Av. neighbours

4.807

4.936

6.671

3.552

Diameter

13

14

14

23

Path length

4.29

4.58

4.41

7.05

Cluster coefficient

0.280

0.262

0.255

0.271

Density

0.012

0.012

0.016

0.009

Heterogeneity

1.149

1.087

1.638

1.283

Centralization

0.127

0.106

0.322

0.136

Connected components

18

15

9

78

Modularity^#

0.701

0.676

0.756

0.838

Modules^#

29

24

16

91