Biofilm DNA was isolated from a variety of locations. NanoDrop provided DNA yield. Agarose gel (1.2%) was used to assess quality. Each biofilm sample provided high-quality, high yield DNA when processed with the DNeasy PowerBiofilm Kit.
The DNeasy PowerBiofilm Kit was used to extract DNA from stream epilithic biofilms. Biofilm was removed from stream pebbles using sonication. The sample was then pelleted through centrifugation, resuspended in Solution MBL and transferred to the bead tube. (Data kindly provided by A.T. Gildemeister, University of Stirling, UK)
PCR performed using the KAPA 2GTM Fast HotStart Kit. Universal 16S rRNA gene (StreF/StreR) primers were used. This generated a 1,243 bp product.