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Carbon subsidies in the form of glucose alleviate the dependence of  heterotrophic bacteria on photoautotroph derived C(C)  exudates. This should result in an increase in resource space and biomass for bacteria and a decrease in  resource space and biomass for photoautotrophs due to increased competition for  mineral nutrients (for simplicity we illustrate competition for P but this is equally applicable other elements that may limit primary production). We hypothesized that this predicted change in biomass pool size  of these two groups will result in changes in the plankton community  composition of both groups that will propagate to to the composition of biofilm  communities for both groups. We refer to shifts in the demand and availability of resources among components of the microbial community as 'partitioning.