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          Institute: MPI für Evolutionsbiologie     Collection: Limnological River Station Schlitz     Display Documents

ID: 442360.0, MPI für Evolutionsbiologie / Limnological River Station Schlitz
Pioneering bacterial and algal communities and potential extracellular enzyme activities of stream biofilms
Authors:Pohlon, Elisabeth; Marxsen, Jürgen; Küsel, Kirsten
Date of Publication (YYYY-MM-DD):2010-02-01
Title of Journal:FEMS Microbiology Ecology
Journal Abbrev.:FEMS Microbiol. Ecol.
Issue / Number:3
Start Page:364
End Page:373
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description: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
Free Keywords:biofilm; bacteria; algae; community structure; extracellular enzymes; stream
Comment of the Author/Creator:Published online: 18 Nov 2009. Final version published online: 15 December 2009.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/AG Limnologische Fluss-Station
External Affiliations:Limnology Research Group, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Str. 159, 07743 Jena, Germany;
Institut für Allgemeine und Spezielle Zoologie, Tierökologie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 26-32, 35392 Gießen, Germany
LOCALID:1107 [Publication no.]
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