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Spring bloom nutrient dynamics in the Oslofjord

Primary production and uptake rates of ammonium, nitrate and silicic acid were mea- sured during the 1996 spring bloom in the Oslofjord, southern Norway, using isotope methodology ( 14 C, 15 N and 32 Si). Chlorophyll a (chl a) standing stock peaked at 38 mg chl a m -3 . Diatoms, especially Thalassiosira nordenskioeldii, dominated the plankton community. The diatom bloom followed a sigmoid growth pattern until it abruptly declined. Both nitrate and silicic acid were depleted from the surface layer during the bloom. Nitrate was the major nitrogen-source for phytoplankton growth, the f-ratio was >0.9 until the bloom declined. Virtually all the silicic acid was converted into diatom frus- tules (biogenic silica), and silicon controlled the primary production during the bloom.