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relative differences between planktonic and biofilm diversity found in
\citet{22237539}} compared to this study.
In %In addition, for this study, it is important to note that biofilm community
richness %richness peaked at the intermediate treatment (C:P = 100) and appeared to
decrease %decrease over time
although %although with only two time points it was unclear how pronounced this effect
was %was (Figure~\ref{fig:rarefaction}). Since biomass of the plankton and the
biofilm %biofilm increased with increasing C subsidies the intermediate peak in OTU
richness %richness is consistent with a classic productivity-diversity relationship that
has %has been shown for many ecosystems and communities both microbial and
otherwise. %otherwise. However, as with other experiments with this result our experimental
design %design did not allow us to tell whether resources drove productivity that drove
changes %changes in diversity or whether resources drove diversity which altered
productivity. %productivity. Rather we note that, as diversity decreased in the highest C
treatment %treatment bacterioplankton and biofilm membership became increasingly
similar. %similar. This suggests that environments that contain high amounts of labile
C %C selected for fewer dominant taxa that came to dominate the biofilm
community, %community, overwhelming the species sorting mechanisms that appeared to
dominate %dominate biofilm community assembly in all other treatments. Similarly, while
we %we did not measure extracellular polymeric substances (EPS), direct microscopy
showed %showed that planktonic cells in the highest C treatment (C:P = 500) were
surrounded %surrounded by what appeared to be EPS. Because biofilm EPS appeared also to
increase %increase moving from the low to high C treatments
(Figure~\ref{fig:microscope}) %(Figure~\ref{fig:microscope}) it is possible that more abundant planktonic
cells %cells were more readily incorporated into biofilms due both to increased
"stickiness" %"stickiness" of the planktonic cells as well as the biofilm itself. While we
did %did not observe flocculating DOC which has been shown to dominate high DOC
environments %environments in nature, we did measure a substantial increase in DOC in the C:P
= %= 500 treatment which was more than 2-fold higher than any of the other
treatments. %treatments. Thus additional adhesion of the plankton and the biofilm may also
explain %explain the merging of the planktonic and biofilm bacterial membership in the
highest %highest C treatment.
%\subsection{Lifestyle (biofilm or planktonic) Enriched OTUs}
%