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culture collection' and is a prefix for strains cultured  under low nutrient conditions \citep{Cho_2004, Connon_2002}.  \subsection{Conclusion} In summary this study shows mechanistic links between  large scale concurrent changes in low resolution  community level dynamics and the underlying constituent populations that compose them. We found that autotrophic pools and heterotrophic pools  responded differently to amendments of labile C as hypothesized. Notably while  C amendments altered both pool size and membership of the bacterial communities