TABLE 1

Diversity and microbial cooccurrence network indices of the microbial communitiesa

Level of diversitybIndex of diversity by communityMicrobial cooccurrenced
BacteriaFungi
RichnesscShannon indexEvenness indexRichnessShannon indexEvenness indexNb nodesTotal no. of linksNo. of bacterial linksNo. of fungal linksB/FP/N
Native1,004 ± 98.8 A5.48 ± 0.13 A0.79 ± 0.01 A449 ± 54.8 A3.87 ± 0.21 AB0.63 ± 0.07 A44616,8228,0991,6684.861.09
D1659 ± 19.4 B4.20 ± 0.09 B0.65 ± 0.02 B462 ± 51.8 A3.95 ± 0.31 A0.64 ± 0.04 A3319,5243,2221,7181.881.12
D2435 ± 110.7 C3.62 ± 0.54 B0.59 ± 0.06 B356 ± 51.5 A3.32 ± 0.29 AB0.57 ± 0.04 A1863,7181,4995322.891.07
D3313 ± 56.6 C2.97 ± 0.40 C0.51 ± 0.05 C194 ± 91.0 B2.51 ± 1.42 B0.47 ± 0.22 A1071,3675932192.711.09
  • a Values 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).

  • b D1, high; D2, medium; D3, low.

  • c Richness refers to the number of OTUs defined at the genus level.

  • d Nb 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.