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EcologyLarge concentration of Coscinodiscus sp. breaking down and causing oil slicks on the surface were reported by Grontved (1952). Blooms of this species were also recorded off the Dutch coast in the mid 19th century (Ende, 1849) and more recently in 1972 (Gieskes, 1973). The decline of both these blooms was accompanied by a foul smell presumably due to decaying cell material, which was following oxygen depletion.