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\subsection{Xylose responders are more abundant members of the soil community  than cellulose responders}  $^{13}$C-xylose responders are generally more abundant members based on  relative abundance in bulk DNA SSU rRNA gene content than $^{13}$C-cellulose  responders (Figure~\ref{fig:shift}, p-value 0.00028). However, both abundant  and rare OTUs responded to $^{13}$C-xylose and $^{13}$C-cellulose  (Figure~\ref{fig:shift}). For instance, a \textit{Delftia} $^{13}$C-cellulose  responder is fairly abundant in the bulk samples (``OTU.5'',  Table~\ref{tab:cell}). OTU.5 was on average the 13th most abundant OTU in bulk  samples. A $^{13}$C-xylose responder (``OTU.1040'', Table~\ref{tab:xyl}) has a  mean relative abundance in bulk samples of 3.57e$^{-05}$. Two  $^{13}$C-cellulose responders wer not found in any bulk samples ("OTU.862" and  "OTU.1312", Table~\ref{tab:cell}). Of the 10 most abundant responders 8 are  $^{13}$C-xylose responders and 6 of these 8 are consistently among the 10 most  abundant OTUs in bulk samples.  Responder abundances summed at phylum level generally increased for  $^{13}$C-cellulose (Figure~XX) whereas $^{13}$C-xylose responder abundances  summed at the phylum level decreased over time for \textit{Firmicutes},  \textit{Bacteroidetes}, \textit{Actinobacteria} and \textit{Proteobacteria}  although \textit{Proteobacteria} spiked at day 14 (Figure~\ref{fig:babund}).  Bulk abundance trends are roughly consistent with $^{13}$C assimilation  activity.   diff --git a/layout.md b/layout.md  index dd0cf6f..76d9d2f 100644  --- a/layout.md  +++ b/layout.md 
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Significance.tex  Introduction.tex  Results.tex  bulk_rspndr_abund.tex  BD.tex  rrn.tex  Discussion.tex