Micro-organism activity in aggregate layers in shallow eutrophic brackish water as influenced by wind induced mixing; an experimental approach |
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Authors: | G Klinkenberg R Schumann |
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Institution: | 1. Department of Biology, University of Rostock, Freiligrath-Stra?e 7/8, D-18051, Rostock, Germany
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Abstract: | In the shallow eutrophic waters of the Darss-Zingst-ecosystem (Baltic Sea) wind induced mixing of the water column, and resuspension
of sediment is an important phenomenon. Incubation experiments (7 days) with natural water were performed in the laboratory
under simulated mixing conditions in order to assess the effects on abundance, biomass and activity of bacteria, heterotrophic
nanoflagellates and ciliates in the water column and upper bottom layers.
Under calm mixing conditions a bottom layer developed, rich in organic aggregates. Bacterial biomass increased through increase
of bacteria abundance and doubled cell volume. Consequently, biomass of flagellates and, more pronounced, of ciliates increased.
The bottom layer, comprising only 15% of the incubated volume, containedca. 60% of the bacterial biomass and ca. 55% of production, 75 and 95% of flagellate biomass, and ca. 70% of ciliate biomass.
It is concluded that bottom layers rich in organic aggregates, although not being present permanently, play an important role
in the shallow Darss-Zingst-ecosystem. |
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Keywords: | bacteria flagellates ciliates aggregate layers brackish water Baltic Sea |
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