Table 1.

Topological properties of the empirical molecular ecological networks of microbial communities in groups.

Network metrics	Type
	Herbage	Shrub	Arbor	Soil
Number of nodes	533	401	393	754
Number of edges	10,088	6,815	5,233	16,743
Number of positive correlations	5,350	3,738	2,764	11,213
Number of negative correlations	4,738	3,077	2,469	5,530
Ratio of positive to negative correlations	1.129	1.215	1.119	2.028
Average connectivity (avgK)	18.927	16.995	13.316	22.206
Average path distance (GD)	2.224	2.206	2.309	2.640
Average clustering coefficient (avgCC)	0.278	0.311	0.262	0.546
Graph density	0.071	0.085	0.068	0.059
Number of modulesa	9	9	12	17
Modularity	0.285	0.318	0.352	0.648

^aNumber of modules with ≥ 5 nodes in the networks.