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Selective loss and preservation of lake water dissolved organic matter fluorescenceduring long-term dark incubations
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Swedish Species Information Centre, Swedish University of Agricultural Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0003-3509-8266
2012 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 433, 238-246 p.Article in journal (Refereed) Published
Abstract [en]

The biogeochemical processing of dissolved organic matter (DOM) in inland waters is inherently related to its molecular structure and ecological function. Controlled bioassays are a valuable tool to analyze these relationships, but are seldom conducted and compared at temporal scales that typically prevail in natural inland waters. Here we incubated water from six boreal lakes in the dark and examined changes to the initial fluorescence and absorbance after 3.5 years. We identified five fluorescence components with parallel factor (PARAFAC) analysis (CC, CM, CA, CX and CT) and found a consistent change in the relative intensity of two dominant PARAFAC components (increase in CA:CC, corresponding to Peak A:Peak C), commonly found in lake water, that represent terrestrially-derived DOM. Surprisingly, we only found minor changes to specific absorbance (SUVA), and did not find any changes to other spectral indexes including the fluorescence index, humification index and freshness index. By incorporating lakes spanning a wide range of initial total organic carbon concentrations (3.7 to 32.5 mg L− 1), water residence times, and spectral characteristics (e.g. SUVA 1.13 to 3.77 L·mg C− 1·m− 1), we found that the relative intensities of two humic-like peaks were the most revealing of changes to DOM structure during dark incubations. We also verified that inner filter effects were adequately corrected within the concentration range of incubated samples. Thus, the processing of DOM under dark conditions, including microbial decomposition and flocculation, may have a greater influence on the humic-like peaks, particularly CC (Peak C), with negligible changes to more commonly used spectral indexes.

 

Place, publisher, year, edition, pages
2012. Vol. 433, 238-246 p.
National Category
Ecology Oceanography, Hydrology, Water Resources Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-178062DOI: 10.1016/j.scitotenv.2012.06.029ISI: 000308787500024OAI: oai:DiVA.org:uu-178062DiVA: diva2:541975
Available from: 2012-07-26 Created: 2012-07-26 Last updated: 2017-12-07Bibliographically approved

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Kothawala, Dolly N.Koehler, BirgitTranvik, Lars J.

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