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At the seashore in Christmas weather

02.12.2010 - 10:23 |  Looduskalender
Photo: Arne Ader
Translation: Liis
 
Bladderwrack reaching the shore
 
   Bladderwrack
Põisadru  
    
 
Plenty of people were walking along the seashore on the weekend. The unfrozen and still warm sea has given seaside areas a snow blanket (more than forty centimetres in places), on both sides of the Gulf of Finland. It looks as if the winter joys may stay with us and the light from the snow will conquer the darkness.
 
What is there to see,  thrown up from the sea at the snowdrifts on the border to the leaden grey open water? Bladderwrack, green algae, red algae ...
 
Our best known and also largest seaweed is the bladderwrack. This brown alga can become up to 75 cm tall in favourable conditions and the colour varies from blackish brown to the olive green of plants growing near ship lines. The plant branches in a regular fashion, each frond dividing nicely into two, then again into two etc., etc. ...
 

It is fixed to the sea bottom, generally to stones, by way of a disc. And about the “bladders“ or vesicles that gives the plant its name: the bladders sit in pairs on the fronds and make them buoyant.  If it isn’t attached to the bottom, the plant floats, and so there are banks of bladderwrack on the shore after a storm, used by people on the coast as a fertilizer on the fields. 


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