Abstract
Mariager Fjord is a narrow, shallow fjord in northeastern Denmark connected to the Kattegat by a long (>20 kin) channel of less than 10 m depth that limits water exchange between the sea and the central basin (28 m depth). The water column in the central basin is stabilized by a density gradient and exhibit a distinct redox stratification, where the 02 downward flux balances the overall upward H2S flux (Ramsing et al., 1996; Fenchel et al., 1995). In order to better understand the redox reactions taking place in the chemocline and the microorganisms involved, high resolution profiles of different electron donors (Fe 2+, Mn 2+, NH 4§ H2S), acceptors (Fe 3+, Mn 4§ NO~, 02) and sulphur intermediates were determined and combined with direct rate measurements (35S-sulphate-reduction in the sediment, 14C-bicarbonate fixation rates in the water column). Additionally, traditional microbiological methods, e.g. enrichments and MPN counts, as well as modem molecular methods were applied.
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