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% Fakesubsubsection:In a crude sense, biofilm and planktonic microbial  In a crude sense, biofilm and planktonic microbial communities divide into two  key groups: oxygenic phototrophs including eukaryotes and cyanobacteria  (hereafter "photoautotrophs"), and, heterotrophs. heterotrophic bacteria.  This dichotomy, admittedly an abstraction, can be a powerful paradigm for understanding  community shifts across ecosystems of varying trophic state  \citep{Cotner_2002}. Heterotrophic bacteria Heterotrophs  meet some to all of their organic carbon (C) requirements from photoautotroph produced C while simultaneously competing with photoautotrophs for limiting nutrients such as phosphorous (P) \citep{379}. The presence of external C inputs, such as terrigenous C leaching from the watershed \citep{Jansson_2008, Karlsson_2012} or C exudates derived from macrophytes \citep{Stets_2008, Stets_2008b}, can alleviate bacterioplankton heterotroph  reliance on photoautotroph derived C and shift the bacterioplankton-photoautotroph heterotroph-photoautotroph  relationship from commensal and competitive to strictly competitive \citep[see][Figure~\ref{fig:conceptual}]{Stets_2008}. Assuming this mechanism, increased C supply should increase the resource space available to the bacteria heterotroph  and lead to increased competition for mineral nutrients, decreasing nutrients available for photoautotrophs {\textendash} assuming that bacteria heterotroph  are superior competitors for limiting nutrients as has been observed \citep[see][Figure~\ref{fig:conceptual}]{COTNER_1992}. These dynamics should result in the increase in bacterial heterotroph  biomass relative to the photoautotroph biomass along a gradient of increasing labile C inputs. We refer to this differential allocation of limiting resources among components of the microbial community as niche partitioning, in reference to the n-dimensional resource space available to members of the microbial community. % Fakesubsubsection:While these gross level dynamics have been discussed  While these gross level dynamics have been discussed conceptually  \citep{Cotner_2002} and to some extent demonstrated empirically  \citep{Stets_2008}, the effect that these shifts in the bulk biomass pool have  on membership and structure of the photoautotroph and heterotrophic  bacterial community has not been directly evaluated in planktonic or biofilm communities. In addition, how dynamics in planktonic communities are propagated to biofilms during community assembly is not well understood. We designed this study to test a) if C subsidies shifted the biomass balance between autotrophs and heterotrophs within the biofilm or its seed pool (the plankton) and b) measure how these putative changes in pool size altered membership and structure of the plankton communities and affected recruitment of plankton during biofilm community assembly. To do so, we amended marine mesocosms with varying levels of labile C input and evaluated differences in photoautotroph and heterotrophic  bacterial biomass in plankton and biofilm samples along the C gradient. In each treatment we characterized plankton and biofilm community composition by DNA sequencing 16S rRNA genes and plastid 23S rRNA genes.