Regionalverteilung der Bakterienzahl und -aktivität in der mittleren Ostsee

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Abstract
During May 1975 the following parameters were determined for the surface and near bottom waters in the area between the Bornholm Gatt and the Danzig Bight: total bacterial number, biomass, saprophyte counts and uptake of organic solutes by heterotrophic microorganisms. High values for all parameters were recorded in the surface waters (5 m depth) in the western part of the study area. In the region of the Stolp Channel bacterial numbers and activity were low. Slightly higher values were observed in the Danzig Bight. In the near bottom waters (5 m above sediment) the highest values were measured in the Bornholm Gatt and Danzig Bight. The regional distribution of bacterial numbers and activity in surface waters is closely correlated with the spring phytoplankton bloom, showing a maximum development in the late stages and after the collapse of the bloom. Bacterial numbers and activity in the near bottom waters depend on the sedimentation rate of particulate organic matter and on the resuspension of sediment particles.