Summary
All stations along the Swedish west coast had quite high species diversity when considering the season but most cells were only found in low cell numbers. The order Dictyochales was common at all stations except at Å17. The order was present in both its naked form but also in the forms known as Dictyocha fibula and Octactis speculum. The coccolithophores were common at all stations and at Å17 they consisted of both Emiliania huxleyi and the genus Pleurochrysis. The integrated chlorophyll concentrations were low but within normal for this month. The phytoplankton diversity was generally low in the Baltic with somewhat high species numbers at BY2 and at BCSIII–10. The diatom Cerataulina pelagica was numerous in the Southern Baltic, coinciding well with images taken by the IFCB (Imaging Flow CytoBot), onboard the R/V Svea during the cruise. Integrated chlorophyll concentrations above normal for this month were found at BY2, BY29 and BY38.