Table 3.

List of indicator OTUs associated with contrasting FI. Given are fungal and bacterial indicator OTUs that are positively associated (q < 0.05) with a FI level and also associated with all three FSs of the respective FI. The taxonomic assignment is provided at the lowest possible level and relative abundance across the entire dataset is given. Attributed lifestyles are determined based on rnn copy numbers (oligotrophy < 0.5, copiotroph ≥ 5) to the lowest possible taxonomic rank provided in the rnnDB. The fungal lifestyles of the two fOTUs remained unclassified using FUNGuild. Relative abundance is given in %.

Treatment association	OTU	Relative abundance	Kingdom	Phylum	Class	Order	Family	Genus	q-value	Associated lifestyle	Mean rrn copies	STDEV	Entries in rrnDB
1.4 LU	bOTU17	0.624	Bacteria	Proteobacteria	Alphaproteobacteria	Rhizobiales	Rhodobiaceae		0.010	Oligotroph	1	0	2
	bOTU23	0.150	Bacteria	Firmicutes	Bacilli	Bacillales	Bacillaceae	Bacillus	0.010	Copiotroph	10.31	2.4	798
	bOTU6	0.088	Bacteria	Firmicutes	Bacilli	Bacillales	Bacillaceae	Bacillus	0.010	Copiotroph	10.31	2.4	798
	bOTU1379	0.036	Bacteria	Actinobacteria	Actinobacteria	Micrococcales	Promicromonosporaceae		0.013	Oligotroph	3.09	0.3	11
0.7 LU	bOTU972	0.081	Bacteria	Chloroflexi	Chloroflexia	Chloroflexales	Roseiflexaceae	Roseiflexus	0.034	Oligotroph	2	0	2
	bOTU473	0.025	Bacteria	Proteobacteria	Deltaproteobacteria	Desulfuromodales	Geobacteraceae	Geobacter	0.028	Oligotroph	2.64	0.93	14
	bOTU2583	0.006	Bacteria	Verrucomicrobia	OPB35_soil_group				0.038	Oligotroph	2.49	0.84	41
	fOTU62	0.333	Fungi	Ascomycota	Dothideomycetes	Pleosporales			0.044	Unlassified	–	–	–
	fOTU82	0.216	Fungi	Ascomycota	Sordariomycetes	Sordariales	Chaetomiaceae		0.031	Unlassified	–	–	–