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Seaweeds and marine plants

by Johnny Reker

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Chorda filum by Jan  Nicolaisen, Orbicon
Furcellaria lumbricalis by Jan  Nicolaisen, Orbicon
Callithamnion sp. by Jan Nicolaisen, ORBICON
Delesseria sanguinea by Jan  Nicolaisen, Orbicon
Crust forming redalgae and starfish by Jan Nícolaisen, ORBICON
Laminaria hyperborea and Halidrus siliquosa by Jan  Nicolaisen, Orbicon
Sargassum muticum - an invasive species from the Pacific Ocean by Jan  Nicolaisen, Orbicon
Odonthalia dentata (Tandtang) by Jan Nicolaisen
Desmarestia aculeata (Kællingehår) 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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