Table 1.

Core genera and core OTUs and their average relative abundances in household biogas digesters

Core genera/OTUs	Relative abundance (%)			Core genera/OTUs	Relative abundance (%)
	Cluster I	Cluster II	All samples		Cluster I	Cluster II	All samples
Phylum Firmicutes				Phylum Firmicutes
Clostridium	34.37 ± 4.26	10.56 ± 1.29	19.42 ± 2.49	Anaerovorax	0.72 ± 0.14	0.57 ± 0.09	0.62 ± 0.08
OTU1	16.39 ± 2.63	5.27 ± 0.90	9.41 ± 1.38	Ruminococcus	0.45 ± 0.13	0.66 ± 0.14	0.58 ± 0.10
OTU1200	3.27 ± 0.62	0.59 ± 0.12	1.59 ± 0.31	Oscillospira	0.09 ± 0.02	0.32 ± 0.10	0.23 ± 0.06
OTU24	1.29 ± 0.28	0.51 ± 0.14	0.80 ± 0.15	Phylum Synergistetes
Clostridium XI	10.36 ± 1.84	2.09 ± 0.28	5.17 ± 0.92	Cloacibacillus	3.90 ± 1.74	4.05 ± 1.13	3.99 ± 0.93
OTU2	5.22 ± 1.17	1.34 ± 0.22	2.78 ± 0.53	OTU5	3.38 ± 1.58	3.31 ± 1.07	3.34 ± 0.87
OTU3	4.62 ± 0.95	0.70 ± 0.12	2.16 ± 0.46	Aminobacterium	0.52 ± 0.14	0.85 ± 0.22	0.73 ± 0.15
Turicibacter	4.53 ± 0.85	1.57 ± 0.24	2.67 ± 0.41	Phylum Actinobacteria
OTU4	4.53 ± 0.85	1.57 ± 0.24	2.67 ± 0.41	Corynebacterium	0.34 ± 0.16	0.69 ± 0.20	0.56 ± 0.14
Syntrophomonas	2.01 ± 0.66	2.19 ± 0.38	2.12 ± 0.33	Leucobacter	0.42 ± 0.14	0.09 ± 0.02	0.21 ± 0.06
OTU9	1.63 ± 0.62	1.08 ± 0.31	1.28 ± 0.30	Phylum Spirochaetes
Sedimentibacter	0.44 ± 0.12	1.50 ± 0.35	1.10 ± 0.23	Candidatus Cloacamonas	0.39 ± 0.19	5.35 ± 1.02	3.50 ± 0.74
OTU19	0.32 ± 0.08	1.07 ± 0.26	0.79 ± 0.17	Phylum Chloroflexi
Tissierella	1.73 ± 0.48	0.54 ± 0.15	0.98 ± 0.21	OTU10 (Anaerolinaceae)	4.41 ± 1.44	0.67 ± 0.15	2.06 ± 0.59