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Effect of exposure to sunlight and phosphorus-limitation on bacterial degradation of coloured dissolved organic matter (CDOM) in freshwater
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2008 (English)In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 64, no 2, 230-239 p.Article in journal (Refereed) Published
Abstract [en]

This study reports on the interacting effect of photochemical conditioning of dissolved organic matter and inorganic phosphorus on the metabolic activity of bacteria in freshwater. Batch cultures with lake-water bacteria and dissolved organic carbon (DOC) extracted from a humic boreal river were arranged in an experimental matrix of three levels of exposure to simulated sunlight and three levels of phosphorus concentration. We measured an increase in bacterial biomass, a decrease in DOC and bacterial respiration as CO2 production and O2 consumption over 450 h. These measurements were used to calculate bacterial growth efficiency (BGE). Bacterial degradation of DOC increased with increasing exposure to simulated sunlight and availability of phosphorus and no detectable growth occurred on DOC that was not pre-exposed to simulated sunlight. The outcome of photochemical degradation of DOC changed with increasing availability of phosphorus, resulting in an increase in BGE from about 5% to 30%. Thus, the availability of phosphorus has major implications for the quantitative transfer of carbon in microbial food webs

Place, publisher, year, edition, pages
2008. Vol. 64, no 2, 230-239 p.
Keyword [en]
bacterial growth efficiency, BGE, CDOM, DOC, UV light, phosphorus
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-107687DOI: 10.1111/j.1574-6941.2008.00449.xISI: 000254948400008OAI: oai:DiVA.org:uu-107687DiVA: diva2:232467
Available from: 2009-08-24 Created: 2009-08-24 Last updated: 2014-01-17Bibliographically approved

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