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to evaluate how changes in available C affected the biomass pool size,  membership and structure of planktonic and biofilm communities.  Our results suggest that C subsidies increased heterotroph biomass in both  plankton and biofilm communities as predicted. C input amendments  also resulted in decreased photoautotroph biomass in the plankton community,  but there was no significant change in biofilm photoautotroph biomass  between resource treatments. Although the DOC concentration in the highest 
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treatment levels and both timepoints. While we did not (could not) specifically  measure niche diversity within the biofilm communities our results suggest that  the biofilm habitat selected for unique members of the photoautotroph and  bacterioplanktonic heterotrophic  community that were in low abundance in the planktonic habitat but readily became major constituents of the biofilm community.  % Fakesubsubsection:few studies have 
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mineral nutrients from a larger heterotroph community, however there was not  a similar decrease in biofilm photoautotroph community. In addition membership  of the photoautotroph communities between the plankton and biofilm lifestyles  did not become more similar in the photoautotrophs as it did for the bacteria bacterial heterotrophs  in the highest C treatment. Consistent with a growing body of work our results  suggest that complex environmental biofilms are a unique microbial community  that form from taxa that are found in low abundance in the neighboring  communities. This membership was affected by resource C  amendments for heterotrophic but not autotrophic microbes and then only in the most extreme  resource environment. This suggests that lifestyle is a major division among  environmental microorganisms and although biofilm forming microbes must travel