Figure 4.

Phylum compositions of all taxa, specialists, generalists and other taxa. The largest pie in the middle shows the phylum compositions of total bacteria. Sequences that are not classified or can be classified into known groups but have a mean relative abundance <0.1% are assigned to “others.” The eleven smaller pies show the proportions of specialists, generalists and the remaining groups belonging to Proteobacteria, Acidobacteria, Actinobacteria, Chloroflexi, Nitrospirae, Gemmatimonadete, Bacteroidetes, Verrucomicrobia, Parcubacteria, Firmicutes, and others.