Abstract
The concentration and molecular weight composition of dissolved organic carbon (DOC) was measured during a spring diatom bloom in eutrophic Lake Mossø, Denmark. The concentration fluctuated between 5.2 and 7.2 mg Cl −1. No relationship between DOC concentrations and phytoplankton biomass or primary production was observed. Diurnal variations of a magnitude similar to variations on a weekly basis were found. A decomposition experiment showed the labile fraction to be of a magnitude similar to the diurnal variation, i.e. 0.7 mg Cl −1. By gel filtration (Sephadex G-50 and G-15) it was shown that 70–90% of the DOC pool was <700 daltons and probably <300 daltons. The labile fraction consisted of low molecular weight compounds.
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