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The substitution of canopy-forming perennial algae by annual filamentous algae is a common phenomenon on eutrophicated rocky shores with potential consequences for marine biodiversity. In the upper littoral of the northern Baltic Sea, this process is exemplified by decreased occurrence of the brown alga Fucus vesiculosus and increased amounts of filamentous algae (e.g. Cladophora glomerata and Pilayella...
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