Fig. 6

Phylogenetic distribution of sequences in GH13 assigned to the identified phylum (a) and genus (b). c Relative abundances of archaeal communities involved in methane metabolism at the genus level. The Kruskal–Wallis multiple comparisons was used for mean comparison, and asterisk indicated the significant difference (*P < 0.05). CON control diet, BS control diet plus Bacillus subtilis, MCE control diet plus Macleaya cordata extract