Abstract
The European water framework directive and the marine strategy framework directive have the objective to establish at least ‘good’ ecological status in all European waters by 2015. Therefore a classification system has to be established in each European country, in order to assess their water bodies. For the German coastal waters of the Baltic Sea, a classification system for phytoplankton based on the abundance of Cyanophyceae and Chlorophyceae was already presented. This system has been successfully adapted in regions with low salinity levels (<10 PSU). With this study, we present the results trying to develop a classification system for our German region of the Baltic Sea characterized by higher salinity (>15 PSU). All present taxonomic groups, most common species and functional groups were tested. It could be shown that all tested correlations to nitrogen concentration as eutrophication descriptor are relatively week. Nevertheless, the biovolume of Cryptophyceae was found to be the most reliable phytoplankton composition indicator, which could serve as future assessment criterion. Furthermore, as proposed by some experts, the use of maximal dissolved winter nitrogen concentration as eutrophication descriptor might be an advantage over using the total nitrogen concentrations in summer.
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Jaschinski, S., Flöder, S., Petenati, T. et al. Effects of nitrogen concentration on the taxonomic and functional structure of phytoplankton communities in the Western Baltic Sea and implications for the European water framework directive. Hydrobiologia 745, 201–210 (2015). https://doi.org/10.1007/s10750-014-2109-9
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DOI: https://doi.org/10.1007/s10750-014-2109-9