Fig. 3From: The core populations and co-occurrence patterns of prokaryotic communities in household biogas digestersTaxonomic compositions of microbial communities in Cluster I and II. Relative abundances (% of total reads) of 16S rRNA gene a at the phylum level of prokaryote, b at the genus level of bacteria, and c at the genus/family level of methanogens. **Significant at p < 0.01, *significant at p < 0.05Back to article page