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  Pioneering bacterial and algal communities and potential extracellular enzyme activities of stream biofilms

Pohlon, E., Marxsen, J., & Küsel, K. (2010). Pioneering bacterial and algal communities and potential extracellular enzyme activities of stream biofilms. FEMS Microbiology Ecology, 71(3), 364-373. doi:10.1111/j.1574-6941.2009.00817.x.

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LFS1107_2010PohlonMarxsenKüsel.pdf (Publisher version), 448KB
 
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Published online: 18 Nov 2009. Final version published online: 15 December 2009.
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 Creators:
Pohlon, Elisabeth, Author
Marxsen, Jürgen1, Author           
Küsel, Kirsten, Author
Affiliations:
1Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976546              

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Free keywords: biofilm; bacteria; algae; community structure; extracellular enzymes; stream
 Abstract: Microbial biofilms are important for the turnover of organic matter in small streams. A rapid colonization of the epilithic surface will become more important given the predicted increase of flood events. Here, we elucidated the pioneering community structure and activity of stream biofilms. Colonization of glass slides exposed in a small stream for 1, 4, 8, 12, and 24 h was compared with those exposed for 7 days or 5 months. Forty thousand microbial cells and 10 algae cm−2 attached to the glass slides within 1 h of exposure. Catalyzed reporter deposition-FISH demonstrated that the pioneer community that settled within 12 h was dominated by Cytophago–Flavobacteria. Later stages were characterized by an enrichment of Gammaproteobacteria and Betaproteobacteria. However, a major fraction of the detected bacterial cells could not be identified beyond the domain level. Green algae dominated the pioneering algal groups, but were outnumbered by filamentous algae after the attachment period. Potential activity of alkaline phosphatase was already detected after 4 h, β-glucosidase after 8 h, and β-xylosidase only after 7 days of biofilm formation. Thus, biofilm formation occurred rapidly and the functionality of the assemblages was evident within a few hours. However, the ratios of β-xylosidase : β-glucosidase suggested that the initial biofilms relied more on autochthonous than on allochthonous carbon sources in contrast to mature biofilm

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Language(s): eng - English
 Dates: 2010-02-01
 Publication Status: Issued
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 Table of Contents: -
 Rev. Type: Peer
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Title: FEMS Microbiology Ecology
  Alternative Title : FEMS Microbiol. Ecol.
Source Genre: Journal
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Pages: - Volume / Issue: 71 (3) Sequence Number: - Start / End Page: 364 - 373 Identifier: -