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The severe eutrophication of coastal areas is considered to be one of the most serious environmental threats of our time S. Nixon, Ambio 19 (1990) 101. Even if the nutrient outlet is curtailed, carpets of green algae filaments will remain for a long time as the algae life cycle feeds itself S. Naeem, D.R. Hahn, G. Schuurman, Nature 403 (2002) 762. One way to master this ecological problem is to remove...
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