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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. Specifically, To do so,  we amended marine mesocosms with varying glucose levels of labile C  input and collected evaluated differences in photoautotroph and bacterial biomass in  plankton and biofilm samples along the C gradient. In each treatment we evaluated  plankton and biofilm samples for community characterization by DNA sequencing 16S rRNA genes and plastid 23S rRNA genes.Additionally, we measured photoautotroph and bacterial biomass in  plankton and biofilm samples along the glucose amendment gradient.