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\subsection{Variation in bulk soil DNA microbial community structure is  significantly less than variation in gradient fractions}   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.