For the bacterial communities derived from sample 2m, a pattern
similar to that for sample TPW was observed, with 62% similarity
in composition between the control communities (i.e., with
no added PAH) and those enriched on HMW-PAHs (Fig. 4C).
The biofilm communities were 85 to 95% similar to planktonic
communities for each PAH.
For enrichments derived from both samples TPW and 2m,
the fungal communities were less diverse than the bacterial
communities based on the number of DGGE bands observed
(see Fig. S2B and S3B in the supplemental material). For TPWderived
fungal communities, there was 68% similarity between
the control community and those communities enriched onHMWPAHs
(Fig. 4B). In contrast to the bacterial community, the fungal
communities did not cluster according to the added substrate. The
biofilm communities enriched on the filters containing Pyr and BaP
were approximately 92% similar to each other, with the BbF filter
community being 77% similar. Planktonic communities were 95%
similar to each other (regardless of PAH). A similar trend was observed
with the 2m fungal communities (Fig. 4D), whereby the biofilm
communities enriched on the filters were 95% similar to each