Algae report number 6, 2021

Type: Report
Author: Ann-Turi Skjevik, Marie Johansen


All stations along the west coast had a domination of diatoms to some extent. Most common was Dactyliosolen fragilissimus. The dinoflagellates were not common and mostly represented by the genus Tripos. The coccolithophorid Emiliania huxleyi was found in relatively high numbers at several stations. The integrated chlorophyll concentrations were normal at all stations for this month only exception was W Landskrona where they were above normal. The reported Prymnesiales* bloom from last month was still heavy and caused high chlorophyll fluorescence peaks at many stations. The peaks were too deep to affect most integrated chlorophyll concentrations, both 0-10 (map on front page) and 0-20 meters. In the southern Baltic some stations actually had integrated 0-10-concentrations below normal. A few stations had integrated chlorophyll concentrations (0-20 m) above normal for this month. The filamentous cyanobacterium Aphanizomenon flosaquae was found in rather high amounts at BCSIII-10, BY15, BY29 and BY38, just like last month. A few filaments of Nodularia spumigena* were present at BY2.