Abstract
Various signs of a changing Baltic Sea (e.g. increased occurrence of green algae blooms in the coastal zone, reduced transparency in the water column and more frequent periods of anoxic conditions in the deeper sub-basins) have made people aware of the vulnerability of the Sea (see e.g. Rosenberg et al. 1990). To restore the Baltic Sea to a pre-eutrophied state, the decision-makers have advocated remedy actions (HELCOM 1991), similar to what successfully has been done for limnic ecosystems. There are, however, several problems with this. The major problem is that the Baltic has a most heterogeneous character. While limnic systems usually are phosphorus limited, the Baltic proper generally has a nitrogen-limited primary production. Phosphorus limitation may be found in the coastal zone and the Bothnian Bay. Only the Bothnian Sea has more balanced conditions in its interior (Granéli et al. 1990). The dominant sources of nitrogen are, in addition, usually of diffusive character, which will obstruct any remedy action.
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Rahm, L., Danielsson, Å. (2001). Statistical Analysis of Spatial and Temporal Variations in the Baltic Sea. In: Wulff, F.V., Rahm, L.A., Larsson, P. (eds) A Systems Analysis of the Baltic Sea. Ecological Studies, vol 148. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04453-7_12
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DOI: https://doi.org/10.1007/978-3-662-04453-7_12
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