Sources of Organic-Carbon in the Littoral of Lake Gloomier as Indicated by Stable Carbon-Isotope and Carbohydrate Compositions

H.T.S. Boschker, E.M.J. Dekkers, R. Pel, T.E. Cappenberg

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    Abstract

    The relative importance of potential carbon sources in the littoral of Lake Gooimeer, a lake in the centre of the Netherlands, was studied using a combination of C-13/C-12-ratio analysis and carbohydrate composition analysis. The littoral is covered on the land side by a 80 m wide Phragmites australis bed. Potential carbon sources were macrophyte litter, seston and benthic algae. Samples of potential carbon sources, sediments and benthic macrofauna from inside and outside the bed were analyzed for their C-13/C-12-ratio and some for their carbohydrate composition. Results indicate that inside the bed, macrophyte litter was the main source of carbon for both the sediment organic matter and the benthic macrofauna, and that algal material was of minor importance. Outside the bed, production by benthic algae was the main carbon source, with seston as a second source. No macrophyte derived material could be detected outside the reed bed. [KEYWORDS: Carbon sources; lake; littoral; stable carbon isotopes; carbohydrate composition Pulsed amperometric detection; fresh-water ecosystems; chromatography; marine; phytoplankton; environment; sediments; dynamics; matter]
    Original languageEnglish
    Pages (from-to)89-105
    JournalBiogeochemistry
    Volume29
    Issue number1
    DOIs
    Publication statusPublished - 1995

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