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EcologyMassive blooms of palmelloid mucilaginous algae attributed to Phaeocystis in the southern North Sea have been recorded in recent years. Blooms off the Dutch coast may occur levels of chlorophyll as high as 50 mg m-³ /day in a 25 m water column (Gieskes & Kraay, 1977). Banks of froth on beaches from the breakdown of these blooms are a visible and olfactory nuisance. Sulphurous products from the blooms may also contribute t the fomration of acid rain (Turner et al., 1988).