Algae report number 1, 2025

Type: Report
Author: Marie Johansen
Published:

Summary

Several stations were not sampled due to stormy weather. The species diversity and total cell numbers were both low at all stations along the west coast. In the Skagerrak the samples had a domination of small cells of various speicies. The plankton community in the Kattegat had low cell numbers and were dominated by small cells. The coccolithophore Emiliania huxleyi was however common at all sampling stations. The integrated chlorophyll concentrations were low but within normal for this month at all stations. Diversity and cell abundance of phytoplankton were generally very low in the Baltic Proper. The only exception was BY2 located in the south west of the Baltic where the diatom Cerataulina pelagica was found in unusual high cell numbers considering the month. At BY29 a few cells of the toxic dinoflagellate Dinophysis acuminata* were found in a sample otherwise poor of cells. The integrated chlorophyll concentrations were low but within the normal range for this month at all stations.