Baltic Sea Eutrophication: A Case Study Using Experimental Ecosystems

  • Sigurd Schulz
Part of the Coastal and Estuarine Studies book series (COASTAL, volume 37)


Remarkable changes have taken place in the Baltic Sea ecosystem in the last decade. One serious problem among these alterations is the evident eutrophication. Therefore, investigations using experimental ecosystems were carried out in the Arkona Sea in the productive seasons in order to study eutrophication effects. For this purpose, the natural water with the plankton community was enriched by nutrients to about the winter level or to about double concentrations. In spring and summer, the phytoplankton responded to this event with rapid uptake of nutrients and an increase in primary production and biomass. In autumn, uptake of nutrients was also rapid but the productivity did not increase and an increase in biomass was only visible in diatoms. With higher nutrient supply, production increased and the productive season was prolonged. This fact is of importance for the function of the pelagic system in the Baltic, because the biomass and nutrients remaining after the spring bloom determine to a great extent the productivity of the whole year.


Nutrient Addition Phytoplankton Biomass Plankton Community Spring Bloom Pelagic System 
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© Springer-Verlag New York, Inc. 1990

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  • Sigurd Schulz

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