MURSYS - Baltic Sea





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MURSYS - Baltic Sea

   
 
 

The first algal bloom observation of this year

  Finnish Institute of Marine Research, FIMR

(http://www2.fimr.fi/en/itamerikanta.html)

Brown and turbid water suprised some divers when diving in an ice covered bay near Porvoo on the coast of the Gulf of Finland last week. They contacted Finnish media and a sample was brought for analysis to FIMR. Dr Guy Hällfors identified the dominating phytoplankton species, the dinoflagellate Scrippsiella hangoei on 14.2..
This species occurs typically under the ice well before the actual vernal bloom in the open sea and can reach very high cell concentrations. Later when the spring bloom has depleted nutrients Scrippsiella hangoei forms resting cells that can colour water bright red. To our knowledge no harmful effects connected to Scrippsiella hangoei blooms have been reported.
Also the haptophycean flagellate Chrysochromulina birgeri can form blooms that colour water and ice brown during this time of the year. Even blue-green algae, in most cases senescent Aphanizomenon flos-aquae, can colour ice and holes in the ice greenish blue or turquoise. Neither of these species has been proven toxic in the Baltic Sea.

Figure 1, Size=27,9 KB

Figure 1: Cells of Scrippsiella hangoei.
Scale bar 30 µm. Photo Seija Hällfors.

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 © 2016 Bundesamt für Seeschifffahrt und Hydrographie Last Update: 19.04.2013 18:03:35  
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