Taxonomic classification of the pyrosequencing reads using the RDP classifier at 80% confidence level. (a) Classification at the phylum level for total reads. (b) Class-level classification for bacterial reads. (c) Class-level classification for archaeal reads. Bact, Bacteria; Arch, Archaea; Pro, Proteobacteria; Pla, Planctomycetes; Def, Deferribacteres; Chl, Chloroflexi; Bac, Bacteroidetes; Act, Actinobacteria; Aci, Acidobacteria; Eur, Euryarchaeota; Cre, Crenarchaeota.