TABLE 1.

Diversity and microbial cooccurrence network indices of the microbial communities^a

Level of diversityb	Index of diversity by community						Microbial cooccurrenced
	Bacteria			Fungi
	Richnessc	Shannon index	Evenness index	Richness	Shannon index	Evenness index	Nb nodes	Total no. of links	No. of bacterial links	No. of fungal links	B/F	P/N
Native	1,004 ± 98.8 A	5.48 ± 0.13 A	0.79 ± 0.01 A	449 ± 54.8 A	3.87 ± 0.21 AB	0.63 ± 0.07 A	446	16,822	8,099	1,668	4.86	1.09
D1	659 ± 19.4 B	4.20 ± 0.09 B	0.65 ± 0.02 B	462 ± 51.8 A	3.95 ± 0.31 A	0.64 ± 0.04 A	331	9,524	3,222	1,718	1.88	1.12
D2	435 ± 110.7 C	3.62 ± 0.54 B	0.59 ± 0.06 B	356 ± 51.5 A	3.32 ± 0.29 AB	0.57 ± 0.04 A	186	3,718	1,499	532	2.89	1.07
D3	313 ± 56.6 C	2.97 ± 0.40 C	0.51 ± 0.05 C	194 ± 91.0 B	2.51 ± 1.42 B	0.47 ± 0.22 A	107	1,367	593	219	2.71	1.09

^aValues were calculated from the sequencing data for the native community and for each level of diversity at T₀ (i.e., the end of the 6 weeks of preincubation). For each level of diversity, values with different letters differ significantly (P < 0.05). Values are expressed as means ± standard deviation (n = 3 biological replicates).

^bD1, high; D2, medium; D3, low.

^cRichness refers to the number of OTUs defined at the genus level.

^dNb nodes, number of taxa connected in the network; bacterial links and fungal links, links involving, respectively, bacteria only and fungi only; B/F, ratio between the numbers of bacterial and fungal links; P/N, ratio between the numbers of positive and negative links in the cooccurrence network.