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Alkaline phosphatase activity of Skeletonema costatum populations in the Trondheimsfjord
Myklestad, S., Sverre; Sakshaug, E. (1983). Alkaline phosphatase activity of Skeletonema costatum populations in the Trondheimsfjord. J. Plankton Res. 5(4): 557-564
In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873, more
Peer reviewed article  

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Keywords
    Algal blooms; Ecophysiology; Enzymatic activity; Fjords; Phosphorus; Population growth; Population growth; Population growth; Skeletonema costatum (Greville) Cleve, 1873 [WoRMS]; ANE, Norway, Trondheimsfjord [Marine Regions]; Brackish water

Authors  Top 
  • Myklestad, S.
  • Sakshaug, E.

Abstract
    During May and June of 1975 and 1976, unialgal blooms of the marine diatom S. 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, beta -1,3-glucan/P and protein/ beta -1,3-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 ppt <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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