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membership and structure. The highest C treatment had the lowest planktonic  photoautotroph abundance, highest planktonic heterotroph abundance, and highest biofilm  biomass. Biofilm communities had higher alpha diversity (i.e. richness) than the planktonic  communities in all mesocosms. Heterotroph plankton and biofilm membership was were  distinct in all but the highest C treatment where heterotroph biofilm and plankton  communities resembled each other after 17 days. Unlike the heterotrophs,  photoautotroph biofilm and plankton communities displayed distinct microbial