Top OTUs detected in 13C-DNA after incubation of soil with 13C-biphenyl, 13C-benzoate, and 13C-naphthalene.

Identification was performed by mothur-implemented RDP reference files [78] and the closest type strain was determined by RDP Seqmatch with the representative sequence of each OTU [76]. The entire dataset is in Table S1.aRelative abundance of sequences.bIdentification of OTU based on identification of the representative at the level of genus as determined by RDP classifier (using 50% threshold).cDetermined by RDP Seqmatch.dScore represents Sab score – the number of (unique) 7-base oligomers shared between the sequence data and a given RDP sequence divided by the lowest number of unique oligos in either of the two sequences.eRefers to samples where the same OTU was detected.