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JOURNAL OF PLANKTON RESEARCH | VOLUME 5 | NUMBER 4 | PAGES 557-564 | 1983
© Oxford University Press

research-article

Alkaline phosphatase activity of Skeletonema costatum populations in the Trondheimsfjord

Sverre Myklestad1 and Egil Sakshaug2

1Institute of Marine Biochemistry, University of Trondheim N-7034 Trondheim-NTH 2The Biological Station, University of Trondheim N-7001 Trondheim, Norway

Received on September 1, 1982; accepted on March 1, 1983 During May and June of 1975 and 1976, unialgal blooms of the marine diatom Skeletonema costatum in the Trondheimsfjord exhibited significant alkaline phosphatase activity, as measured by a fluorometric method. The fairly high activities of some populations correlated well with clear indications of P-limitation obtained by measurement of N/P, ß-l,3-glucan/P and protein/ß-l,3-glucan ratios. Very few significant activities were measured in populations with a cellular N/P ratio below 14, which agrees well with an N to P ]balance point’ of 11-12 for S. costatum. The activity was detected in brackish water with S {per thousand} <30 and was found to be closely related with the cellular phosphorus content, low content leading to high phosphatase activity. The ratio of phosphatase activity to cellular phosphorus is proposed as a sensitive parameter for phosphorus-limited growth. No enzyme activity could be detected in coastal waters outside the fjord.


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