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biofilm communities as predicted. Carbon subsidies also resulted in decreased  photoautotroph biomass in the plankton community, but there was no significant  change in photoautotroph biomass of the biofilm communities among resource  treatments. Although the DOC concentration in the highest C treatment was  significantly higher than the other treatments the concentrations we measured  were in the range of those reported in natural marine ecosystems  \citep{Mopper1980} and it is has been noted that glucose concentrations in  coastal marine ecosystems may fluctuate over several orders of magnitude  \citep{Alonso2006}.  The changes in the biomass pool size that did occur were consistent with changing relationships (commensal to competitive) between the autotrophic and heterotrophic components of the plankton communities but not necessarily of the biofilm communities. While we recognize that other mechanisms may drive the shift in biomass pool size of these two components of the microbial community (e.g. increased grazing pressure on the algae with C additions, or production of secondary metabolites by the bacteria that inhibit algal growth) previous studies \cite{Stets_2008,Cotner_2002} and the data reported here suggest that altered nutrient competition is the most parsimonious explanation for this shift in biomass pool size. \subsection{Biofilm and Plankton Alpha and Beta Diversity} Beyond changes in  the biomass pool size of each community we explored how shifts in resource C