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Biofilm libraries were more even in shape than planktonic libraries (Figure 9) and OTUs enriched in biofilm libraries were enriched less dramatically than planktonic enriched OTUs. It's possible the planktonic environment is more uniform with respect to niche space and therefore produces more skewed rank abundance distributions. Similarly to the richness results, we found the shape contrasts of rank abundance distributions between biofilm and planktonic libraries in our data to be in contrast to that reported by \citet{22237539} although this may be an artifact of each study's different experimental design (see above).   \subsection{Enriched Taxa in High Carbon (C:P = 500) Treatment}  Carbon amendments did not affect algal library membership and structure to the same degree as it affected bacterial library composition. As expected, bacterial  OTUs enriched in the high carbon amended mesocosm (C:P = 500) include OTUS in classic copiotroph families such as \textit{Vibrionacaea} and \textit{Pseudomonadaceae}. Interestingly, the one OTU depleted in the high carbon treatments is annotated as ing being  in the HTCC2188 order of the \textit{Gammaproteobacteria}. HTCC stands for high 'high  throughput culture collection collection'  and is a prefix for strains cultured under low nutrient conditions \cite{Cho_2004, Connon_2002}. In summary this study shows mechanistic links between large scale community level dynamics the underlying populations level that drive them. Ulimately large scale changes in ecosystem processes are driven by composite effects of microbial communities actiing as a synthesis of physiological events embedded in a complex biotic and abiotic matrix.