Giesenhagen, H. C. and Hoppe, Hans-Georg (1991) Seasonal variation in bacterial activity in the near-bottom water layer of Kiel Bight (Western Baltic Sea). Kieler Meeresforschungen - Sonderheft, 8 . pp. 14-19.

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Abstract

The near-bottom water layer is influenced by events in the sediment and by sedimentation from the productive surface layer. Microbial activity in this layer shows occasionally strong gradients from the pycnocline down to the sediment and it reacts to seasonal variations in oxygen content in the adjacent to the sediment. Comparison of mean values of bacterial stock and activity parameters in the productive surface layer and in the near-bottom layer shows, that despite of similar patterns of bacterial biomass and bacterial production in both layers, uptake velocity of leucine, peptidase activity, as well as turnover rates of leucine and hydrolysis rates of peptides are considerably lower in the near-bottom water layer. This is explained by effects of temperature, nutrient quality and oxygen depletion.

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