FIG 5 .

Taxon distribution in sediment microbial communities of natural river and urban waterway systems. (A) Comparison of phylum distribution of the two benthic microbial communities in river water system (13) with urban water system at the phylum level. Diversity indices are shown as follows: S, Shannon index (entropy); E, Buzas and Gibson’s evenness (Mann-Whitney U test, n = 3, P < 0.001). (B) Trends of different classes in the Proteobacteria phylum between the three microbial communities. (C) Distribution of different orders in the Alpha- and Betaproteobacteria classes of the Proteobacteria phylum in the three microbial communities.