Table 2.

The topological characteristics of the co-occurrence network.

	Succession			Longitude			Latitude			MAP
	A	C	M	W	M	E	N	M	S	L	M	H
Num. edge/Num. nodea	2.96	4.04	4.66	6.02	3.95	4.198	5.05	4.09	4.88	6.27	3.33	5.67
The proportion of coexistence edge (%)	87.85	68.80	66.25	62.29	61.44	59.75	56.28	73.19	53.90	62.75	58.49	56.34
The proportion of mutualexclusion edge (%)	12.15	31.20	33.75	37.71	38.56	40.25	43.72	26.81	46.10	37.25	41.51	43.66
Max. degree	45	61	74	163	71	74	87	77	81	175	57	132
Clustering coefficientb	0.34	0.27	0.22	0.34	0.29	0.34	0.29	0.32	0.34	0.36	0.31	0.33
Connected componentsc	45	44	31	34	37	31	35	34	36	30	29	26
Network centralizationd	0.051	0.062	0.079	0.174	0.069	0.095	0.086	0.083	0.097	0.200	0.061	0.159
Network density	0.008	0.009	0.011	0.014	0.009	0.012	0.011	0.010	0.013	0.015	0.008	0.015
Network heterogeneitye	1.20	1.45	1.50	1.33	1.27	1.49	1.28	1.27	1.36	1.4	1.29	1.41
Average degreef	5.93	8.10	9.33	12.05	7.90	8.40	10.12	8.18	9.78	12.55	6.68	11.35
Average path length	4.55	5.02	4.61	4.24	4.09	4.31	4.06	4.02	4.12	3.41	4.49	4.01
The proportion of Eukaryota node (%)	23.57	18.04	9.30	14.71	13.22	31.84	15.11	20.57	28.15	16.77	23.35	25.00
The proportion of Bacteria node (%)	76.43	81.96	90.70	85.29	86.78	68.16	84.89	79.43	71.85	83.23	76.65	75.00

^aAverage connection flux per node.

^bAverage value of each node clustering coefficient in network, which indicateed nodes were embedded in their neighborhood and interconnected together.

^cThe number of subgraphs were not connected with other subgraphs, indicating the modularity.

^dMeasurement of the tendency towards the center of the network.

^eMeasurement of the ability to form a central node in the network.

^fThe average degree of each node, which showed how many connections (on average) each node had in the network.