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0.23, R$^{2}$ 0.63, Figure~\ref{fig:bulk_ord}) but the contrast between only  $^{12}$C additions with additions that included isotopically labeled substrates  was not (p-value 0.35). Responder abundances summed at phylum level generally   %increased 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