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\section*{Figures}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=0.7\columnwidth]{figures/conceptualmodel/biofilmsubsidiesFigs06252013.001.jpg}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:conceptual} Figure \arabic{figure}.}  {Carbon subsidies in the form of glucose alleviate the  dependence of heterotrophic bactria on algal 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  algae due to increased competition for phosphorus (P). We hypothesized  that this predicted change in biomass pool size of these two grouops  will result in changes in the plankton community composition of both  groups that will propogate to to the composition of biofilm communities  for both groups.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=0.7\columnwidth]{figures/pool size/biofilmsubsidiesFigs07252013.003.jpg}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:pool_size} Figure \arabic{figure}.}  {Increases in C resulted in decreases in A) planktonic  algal biomass (estiated as Chl \textit{a} but B) not algal biomass  present in the biofilm \textit{a} in each. In contrast both C) biofilm  total biomass and D) number of planktonic bacterial cells increased  with increasing C subsidies. Responses in treatments separated by  different letters were statistically different from one another  (p<0.05) as was the highest C:P treatment for planktonic bacterial  abundance compared to the the control or the C:P = 10 treatment  (p<0.05). The bacterial abudance sample for the C:P = 100 treatment was  lost before analysis and is therfore not reported in panel d.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/lightmicroscopy.002/biofilmsubsidiesFigs06252013.003.jpg}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:microscope} Figure \arabic{figure}.}  {The structure (density of cells and thickness of biofilm) and  the amount of EPS (cloudy material) increased with increasing C  subsidies from the control to the highest C treatment (C:P=500).}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/combined_rarefaction5/combined_rarefaction5.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:rarefaction} Figure \arabic{figure}.}  {Rarefaction curves for all biofilm versus plankton libraries.  Each panel represents a single C:P treament and time point. Richness is  greater for all planktonic communities when compared to corresponding  biofilm communities.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/biplot_combined1/biplot_combined1.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:pcoa} Figure \arabic{figure}.}  {Principal coordinates ordination of bray-curtis distances for  23S rRNA plastid libraries and 16S rRNA gene libraries. OTU points are  weighted pricipal coordinate averages (weights are relative abundace  values in each sample) and the variance along each pricipal axis is  expanded to match the site variance. Point annotations denote the  amended C:P ratio for the mesocosm from which each sample was derived.  test}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/rank_abund_shape/rank_abund_shape2.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:rank_abund_shape} Figure \arabic{figure}.}  {Rank abundance plots for all date-amendment combinations.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/l2fc_pval_all1/l2fc_pval_all.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:l2fc} Figure \arabic{figure}.}  {$log_2$ of lifestyle OTU proportion mean ratios (bioflm or plankton)  and corresponding, adjusted p-values. Each point represents one  OTU proportion mean ratio and points are grouped along the  x-axis by Order. Outlined points have adjusted p-values below a  false discovery rate of 0.10.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=1\columnwidth]{figures/rank_abund1/rank_abund.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:rank_abund} Figure \arabic{figure}.}  {Rank abundance plots. Each panel represents a single time  point and C:P. The "rank" of each OTU is based on planktonic sample  relative abundance. Each position along the x-axis represents a single  OTU. Both the x and y axes are scaled logarithmically.}  \end{figure}  \begin{figure}[htp]  \begin{center}  \includegraphics[width=0.75\columnwidth]{figures/integrated_rarefaction/integrated_rarefaction.png}  \end{center}  \textbf{\refstepcounter{figure}\label{fig:integ_rarefaction} Figure \arabic{figure}.}  {Rarefaction plots for all samples. Planktonic libraries have  been integrated such that the count for each OTU is the sum of counts  across all samples.}  \end{figure}