Summary
The integrated (0-20 meters) chlorophyll a concentrations were normal for the season at most of the Skagerrak and Kattegat sampling sites. The only exception was Släggö with lower concentrations than normal and Anholt E with higher concentration than normal. The plankton community was relatively low in species diversity in the Skagerrak. Small flagellates such as cryptomonadales were most abundant together with the diatom genus Pseudo-nitzschia. About the same species diversity was found in the Kattegat as in Skagerrak. The same groups dominated as at Skagerrak stations. At Anholt E the diatom species Rhizosolenia pungens was also recorded in high cellnumbers. The integrated (0-20 meters) chlorophyll a concentrations from the Baltic Sea were normal for the season at most stations. The occurrence of cyanobacteria had diminished greatly at most stations since the last expedition. Small flagellates belonging to different groups were observed in high cellnumbers at all stations.