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response to xylose was characterized by a succession in activity from  \textit{Paenibacillus} OTUs (day 1) to \textit{Bacteroidetes} (day 3) and finally  \textit{Micrococcales} (day 7). Notably, \textit{Paenibacillus} have been  previously shown by DNA-SIP to metabolize glucose (CITE), \citep{Verastegui_2014},  also a common sugar in plant biomass. This activity succession was mirrored  by relative abundance profiles and may mark trophic-C exchange between these  groups. While trophic exchange has been observed previously in DNA-SIP studies