{"refrec":{"BRefID":75790,"RR":"<b>Myklestad, S., Sverre; Sakshaug, E.</b> (1983). Alkaline phosphatase activity of <i>Skeletonema costatum</i> populations in the Trondheimsfjord. <i>J. Plankton Res. 5(4)</i>: 557-564. <a href=\"https://dx.doi.org/10.1093/plankt/5.4.557\" target=\"_blank\">https://dx.doi.org/10.1093/plankt/5.4.557</a>","BEntID":71468,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Plankton Res. 5(4)</i>: 557-564. <a href=\"https://dx.doi.org/10.1093/plankt/5.4.557\" target=\"_blank\">https://dx.doi.org/10.1093/plankt/5.4.557</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Myklestad, S., Sverre; Sakshaug, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Myklestad, S., Sverre; Sakshaug, E.","Englishabstract":"During May and June of 1975 and 1976, unialgal blooms of the marine diatom <i>S. Costatum</i> 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 <i>S. Costatum</i>. 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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