Fig. 2
Similar community composition in BB and streamers. a Phylogenetic tree presenting the 16 S rRNA gene diversity sampled from streamers, BB and the inoculum. The bars show the relative abundance (log-transformed) of OTUs in streamers (blue), BB (red), and the inoculum (green). Abundant OTUs are found among diverse taxonomic groups and these abundant OTUs are generally found in similar abundances in each community. b Abundant OTUs in the base biofilm tended also to be abundant in the streamer. Each point indicates an OTU, the color reflect its respective taxonomic affiliation as shown in the inserts. OTUs tend to fall along the 1:1 line (solid line, the dashed lines border the regions in which the abundance of an OTU is two times larger in the respective architecture). Both biofilm architectures were dominated by OTUs classified as Beta- and Gammaproteobacteria
