Table 3.

OTUs with closest taxonomic identification for bacterial groups that had significantly higher relative abundance on specific test polymers.

OTU	Taxonomic identification	p-value	FDR
OTU_000291	Proteobacteria, Alphaproteobacteria, Alphaproteobacteria incertae Sedis (uncultured)	1.73E−05	0.00685
OTU_000164	Bacteroidetes, Sphingobacteriia, Sphingobacteriales (uncultured)	3.33E−05	0.00685
OTU_000139	Bacteroidetes, Sphingobacteriia, Sphingobacteriales, Saprospiraceae (uncultured)	3.87E−05	0.00685
OTU_000084	Proteobacteria, Alphaproteobacteria, Sphingomonadales, Sphingomonadaceae, Novosphingobium	4.14E−05	0.00685
OTU_000037	Planctomycetes, Planctomycetacia, Planctomycetales, Planctomycetaceae (uncultured)	0.000287	0.037723
OTU_015077	Proteobacteria, Alphaproteobacteria, Sphingomonadales, Sphingomonadaceae, Sphingobium	0.000342	0.037723
OTU_001040	Proteobacteria, Alphaproteobacteria, Sphingomonadales, Sphingomonadaceae, Sphingobium	0.000516	0.048791

OTUs that were significantly higher in PE are in bold, and those that were significantly higher in PP and PS are in Italics. To identify as many significant comparisons as possible while still maintaining a low false positive rate, the False Discovery Rate (FDR) at level α = 0.05 were applied.