Files in this Data Supplement:

• Supplemental file 1 - Rarefaction curves of observed OTU richness among the 16S rRNA gene clone libraries obtained from all biofilms (Fig. S1).
  Zipped EPS file, 36K.
• Supplemental file 2 - 16S rRNA-based phylogenetic reconstruction based on maximum-parsimony methods, showing the affiliation of the 16S rRNA gene sequences obtained by cloning from NA biofilms (Fig. S2).
  Zipped TIF file, 1.9MB.
• Supplemental file 3 - 16S rRNA-based phylogenetic reconstruction based on maximum-parsimony methods, showing the affiliation of the 16S rRNA gene sequences obtained by cloning from control biofilms (Fig. S3).
  Zipped TIF file, 2.1MB.
• Supplemental file 4 - Diversity measures of biofilms before and after exchange (Table S1).
  MS Word document, 48K.
• Supplemental file 5 - Legends to Fig. S1 to S3 and Table S1.
  MS Word document, 24K.