Table 1.

Mean relative abundances for the four treatment groups of clusters identified from maximum parsimony tree at family and genus level.

	MCRA Cluster Identification	Treatment				P value
		R	A	RA	AA
Family	Methanobacteriaceae	92.7a	89.4a,b	81.9b	79.0b,c	<0.001
Family	Methanomassiliicoccaceae	7.3a	10.7a,b	18.1b,c	21.1c	<0.001
Genus	Methanobrevibacter	89.2a	79.0b	74.8b	72.1b	<0.001
	M. ruminantium clade	0.1a	14.2b	11.6b	10.3b	<0.0001
	M. gottschalkii clade	70.0a	25.3b	36.1b	32.6b	<0.0001
Genus	Methanosphaera	3.5a	10.4a	7.1a	6.9a	NS

P-values are FDR corrected and derived from Wilcoxon pairwise comparisons of MCRA clusters between different treatment groups.