The diatoms are the dominant group. In the northernmost areas of the transect, off Helsinki, the chlorophyll a concentration has increased, too. There the dinoflagellates are dominating. The information on chlorophyll concentrations and phytoplankton species composition is based on unattended measurements onboard GTS 'Finnjet' on the 27-29th March. The nutrient samples were collected on the 18-20th March.
Diatoms dominate the phytoplankton.
The dinoflagellates Peridiniella catenata and Heterocapsa rotundata are common. Variation in surface salinity and temperature in the Baltic Sea on the 27 - 29th March as recorded on the ferry 'Finnjet'. Variation in surface nitrogen and silicate concentrations in the Baltic Sea on the 18-20th March as recorded on the ferry 'Finnjet'. Variation in surface phosphorus concentrationsin the Baltic Sea in 18-20 March as recorded on the ferry 'Finnjet'.