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  Tracking carbon flow in a 2-week-old and 6-week-old stream biofilm food web

Augspurger, C., Gleixner, G., Kramer, C., & Kusel, K. (2008). Tracking carbon flow in a 2-week-old and 6-week-old stream biofilm food web. Limnology and Oceanography, 53(2), 642-650. doi:10.4319/lo.2008.53.2.0642.

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 Creators:
Augspurger, C., Author
Gleixner, G.1, Author           
Kramer, C.1, Author           
Kusel, K., Author
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1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497773              

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Free keywords: Fatty-acids Community structure Bacteria River Microalgae Microorganisms Population Extraction Strategies Rotifers
 Abstract: We studied the carbon flow of an allochthonous carbon source (sucrose) in a biofilm food web using stable isotope analysis and lipid biomarkers. Initial biofilms were grown for 2 weeks in a third order stream in Thuringia, Germany, and then incubated in replicate flow channels in climate-controlled chambers. Either of two sucrose types, differing in their delta C-13 values, was added either immediately (2-week-old biofilm) or after a pre-incubation of 4 weeks (6-week-old biofilm). Although sucrose decrease rates were similar with both biofilms, 2-week-old biofilms showed a higher carbon uptake capacity cell(-1). The 2-week-old biofilm was characterized by low abundances of all trophic levels, which increased one to two orders of magnitude during sucrose consumption. The 6-week-old biofilm had higher abundances. Biofilm bacteria incorporated added sucrose carbon, but algae showed no significant carbon incorporation, although a part of this carbon should be mineralized to carbon dioxide by bacteria. Sucrose carbon was also incorporated into ciliates and possibly other protozoans. Grazing rates indicated that up to 23.3% of the sucrose carbon reached higher trophic levels in 2-week-old biofilms. Less sucrose carbon was transferred to higher trophic levels in 6-week-old biofilms, where similar carbon amounts might have been channelled via filter feeding from the water column to ciliates. Ciliate community composition seemed to be affected by highly abundant rotifers. Whereas total carbon flow in 2-week-old biofilms was controlled by bacteria capable of high carbon uptake rates, higher trophic levels were more important in 6-week-old biofilms. [References: 42]

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 Dates: 2008
 Publication Status: Issued
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 Identifiers: Other: BGC1126
DOI: 10.4319/lo.2008.53.2.0642
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Title: Limnology and Oceanography
Source Genre: Journal
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Publ. Info: Waco, Tex., etc. : American Society of Limnology and Oceanography.
Pages: - Volume / Issue: 53 (2) Sequence Number: - Start / End Page: 642 - 650 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925421091
ISSN: 0024-3590