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collection' and is a prefix for strains cultured under low nutrient conditions  \citep{Cho_2004, Connon_2002}.  %\subsection{Conclusion}  %In \subsection{Conclusion}  In  summary this study shows mechanistic links between large scale community %level level  dynamics and the underlying constituent populations that compose them. We %found found  that autotrophic pools and heterotrophic pools responded differently to %amendments amendments  of labile C as hypothesized. Notably while C amendments %altered altered  both pool size and membership of the bacterial communities we did not %see see  similar dynamics within the algal communities. Planktonic algae decreased %in in  response to C amendments presumably in response to increased %competition competition  from a larger bacterial community, however there was not a %similar similar  decrease in biofilm algal community. In addition membership of the %algal algal  communities between the plankton and biofilm lifestyles did not become %more more  similar in the algae as it did for the bacteria in the highest C %treatment. treatment.  Consistent with a growing body of work our results suggest that %complex complex  environmental biofilms are a unique microbial community that form from %taxa taxa  (both heterotrophs and autotrophs alike) that are found in low abundance %in in  the neighboring communities. This membership was affected by resource %amendments amendments  for heterotrophic but not autotrophic microbes and then only in %the the  most extreme resource environment. This suggests that lifestyle is a major %division division  among environmental microorganisms and although biofilm forming %microbes microbes  must travel in planktonic form at some point - reproductive success %and and  metabolic contributions to biogeochemical processes comes from those taxa %primarily primarily  if not exclusively while they are part of a biofilm. Our results point to %lifestyle lifestyle  (planktonic or biofilm) as an %important important  trait that explains a portion of the exceptional diversity found in %snapshots snapshots  used to characterize environmental microbial communities in space and %time. time.