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\subsection{Planktonic and biofilm community structure}  \subsubsection{Alpha diversity}  We evaluated alpha diversity in all treatments for both the plankton and the biofilm communities using rarefaction curves. Rarefaction curves showed bacterial and algal OTU richness was consistently higher in the biofilm compared to the planktonic communities (Figure 4). However, for both the algal community and bacterial community analysis the biofilm and planktonic communities had the fewet fewest  OTUs in the highest C:P treatment (500) (Figure 4). \subsubsection{Community membership biofilm versus plankton}  Membership in addition to OTU richness was different among plankton and biofilm treatments. Bacterial community membership between the plankton and biofilm communities was notably different for all treatments except for the highest carbon treatment where the plankton and biofilm communities at day 17 were more similar to each other than any other community (Figure 5). Algal plankton and biofilm communities were also composed of different OTUs however the similarity among algal plankton and biofilm communities in the highest carbon treatment was not observed as it was for the bacterial communities (Figure 5).  In bacterial libraries, sequences were distributed into 636 total OTUs. 57\% of quality controlled sequences fell into the top 25 OTUs in order of decreasing sum of relative abundance across all samples. The most enriched bacterial biofilm OTUs with respect planktonic libraries fell into the Actinobacteria, Bacteroidetes and Proteobacteria (Figure 6). Highest absolute ratios of OTU means of OTU relative abundances  grouped by environment type (plantonic versus biofilm) were found for OTUs enriched in planktonic samples (with respect to biofilm) which is consistent ith the higher alpha diversity in biofilm communities compared to planktonic communiteis. communities.  That is, sequence counts were spread across a greater diversty of taxa in the biofilm libraries compared to the planktonic libraries. Of the top five OTUs ordered by absolute environment type OTU  mean ratios one is annotated as in the \textit{Bacteroidetes}, two \textit{Gammaproteobacteria}, one \textit{Betaproteobacteria} and one \textit{Alphaproteobacteria}. Table 1 lists the top 20 OTUs ordered by absolute environment type mean ratios.  Only three bacterial OTU centroid sequences for the top 20 environment type enriched OTUs (ordered by environment type mean ratio) share high sequence identity with cultured isolates (Table 1). Rations of OTU from relative abundances grouped by environment Environment  type OTU mean ratios  are consistent with  positions of OTUs in the sample ordination space (Figures 5 and 6). NEED TO ADD ALGAL RESULTS (WHAT'S ENRICHED)