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For the \textsuperscript{13}C-cellulose treatment only one Proteobacteria passes the 'responder' criteria at day 3 and two OTUs (Proteobacteria and Chloroflexi) at day 7. By day 14, responders are detected in Proteobacteria, Verrucomicrobia, Chloroflexi, Plancktomycetes, and Actinobacteria. The same responders are detected at day 30 with the exception of Actinobacteria and the addition of Bacteriodetes.   Kernel density estimates (KDE) of the CsCl density shifts measured in \textsuperscript{13}C-xylose were compared to KDE of \textsuperscript{13}C-cellulose (Fig 3A). In general, xylose utilizers have a smaller density shift (<0.02 mg/L) than cellulose utilizers (0.005-0.03), with few exceptions. This suggests a greater substrate specificity among cellulose degraders than xylose degraders. The vast majority of xylose degraders are found at a lower rank abundance than cellulose degraders; which fall among the rare taxa in the tail of the rank abundance curve (Fig 3B). This suggests that taxa important to C-cycling may be difficult or unable to detect in bulk community sequencing efforts. This supports evidence of functionally important taxa being in the rare biosphere. Additionally, there are few OTUs that utilize both xylose and cellulose. Figure 4 is a tree of