Methanobacterium.
Generally, the number of keystone nodes decreased as the nitrate amendment proceeded longer (Figure S4). That is, the network simplification occurred alongside the loss of keystone taxa. Recall thatThiobacillus was barely detectable in the control communities (< 0.02% relative abundance) but dominated the late nitrate communities (~60.88%). However, it was never a keystone genus, showing no significant covariations in any network (Table S3).