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Seaweeds and marine plants

by Johnny Reker

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Cladophora glomerata by Metsähallitus
Chara sp. by Metsähallitus
Chorda filum and Fucus vesiculosus by BioGeo project and Metsähallitus
Fucus vesiculosus by Metsähallitus
Laminaria by Karsten Dahl
Dilsea carnosa by Karsten Dahl
Crust-forming red algae by Karsten Dahl
Enteromorpha sp. by Metsähallitus
Zostera marina by Peter Bondo Christensen
Seeds in Zostera marina by Peter Bondo Christensen
Enteromorpha sp. and Pilayella littoralis by Peter Bondo Christensen
Red crustforming algae by Peter Bondo Christensen
Sponge and red algae by Jan  Nicolaisen, Orbicon
Rhodemela confervoides by Jan  Nicolaisen, Orbicon
Laminaria saccharina by Jan  Nicolaisen, Orbicon
Laminaria hyberborea by Jan  Nicolaisen, Orbicon
Crust forming redalgae by Jan  Nicolaisen, Orbicon
Grazers on Enteromorpha by Jan Ekebom
Grazers on Enteromorpha II by Jan Ekebom
Dilsea carnosa by Jan  Nicolaisen, Orbicon

Description: The marine seaweed communities of the Baltic Sea are facing an unique challenge - the adaption to a constant low salinity. The number of registrered species falls from 325 in northern Kattegat to less than 100 in the Gulf of Bothnia. The large brown seaweeds such as Laminaria sp. is unable to grow in low salinity, which allow species such as Fucus vesiculosus to move beneath the water and become the dominating species. Furthermore, the growth and sexual reproduction of many species is influenced, and they tend to be smaller and apply vegetative reproduction the lower the salinity gets.

For more information on the the distribution of the species in the Baltic Sea, see Nielsen, R., Kristiansen, Aa., Mathiesen, L., Mathiesen, H., 1995 Distributional index of the benthic macroalgae of the Baltic Sea areas. Acta Botanica Fennica 155.
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