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Author (up) Wagner, K.; Besemer, K.; Burns, N.R.; Battin, T.J.; Bengtsson, M.M. url  doi
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  Title Light availability affects stream biofilm bacterial community composition and function, but not diversity Type Journal Article
  Year 2015 Publication Environmental Microbiology Abbreviated Journal Environ Microbiol  
  Volume 17 Issue 12 Pages 5036–5047  
  Keywords ecology, bacteria  
  Abstract Changes in riparian vegetation or water turbidity and browning in streams alter the local light regime with potential implications for stream biofilms and ecosystem functioning. We experimented with biofilms in microcosms grown under a gradient of light intensities (range: 5 – 152 mumole photons s- 1 m- 2 ) and combined 454-pyrosequencing and enzymatic activity assays to evaluate the effects of light on biofilm structure and function. We observed a shift in bacterial community composition along the light gradient, whereas there was no apparent change in alpha diversity. Multifunctionality, based on extracellular enzymes, was highest under high light conditions and decoupled from bacterial diversity. Phenoloxidase activity, involved in the degradation of polyphenolic compounds, was twice as high on average under the lowest compared to the highest light condition. This suggests a shift in reliance of microbial heterotrophs on biofilm phototroph-derived organic matter under high light availability to more complex organic matter under low light. Furthermore, extracellular enzyme activities correlated with nutrient cycling and community respiration, supporting the link between biofilm structure-function and biogeochemical fluxes in streams. Our findings demonstrate that changes in light availability are likely to have significant impacts on biofilm structure and function, potentially affecting stream ecosystem processes.  
  Address WasserCluster Lunz, Lunz am See, Austria  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1462-2912 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:26013911 Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 1179  
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