Uptake and assimilation of nitrogen by marine diatoms—I. Kinetics of nitrogen uptake

摘要: Axenic cultures of marine diatoms,Achnanthes hauckiana Grun.,Amphora coffeaeformis (Agardh) Kutz.,Fragilaria pinnata Ehr.,Synedra tabulata Kutz.,Thalassiosira weissflogii (Grun.) Fryxell et Hasle (=Thalassiosira fluviatilis Hustedt) andTriceratium dubium Brightwell isolated from tropical waters were used for a comparative study kinetics NO3−, NO2− and NH4+ uptake. Nitrogen uptake by diatoms in this followed the classical reported previous workers. Diatoms which showed highK3 NO3− had But no correlation could be obtained between cell size andK3 nutrient an inverse relationship specific growth rate was also not obtained. However, there good observedK3 status habitats isolated. Studies on interactions revealed that inhibited both non-competitively whereas each other competitive manner. Inhibition greater than reverse situation.