Abstract
Michaelis-Menten uptake kinetics were observed at all light intensities. With constant illumination, the Vmax and K1 in nitrate uptake over the natural light intensity range of 0 to 2000 μE were 0.343 μg-at NO3−N(μg)-1 at protein-N h-1 and 26 μE, respectively. Nitrate uptake was inhibited at higher light intensities. The Ks for nitrate uptake did not vary as a function of light intensity remaining relatively constant at 0.62 μg-at NO3−N 1-1. With intermittent illumination, the Vmzx for light intensity in nitrate uptake over a light intensity range of 0 to 5000 μE was 0.341 μg-at NO3−N(μg)-1-at protein-N h-1. No inhibition of nitrate uptake was observed at higher than natural light intensities. Chaetoceros curvisetus will probably never experience light inhibition of nitrate uptake under natural conditions.
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Armstrong, F. A. J., C. R. Sterns and J. D. H. Strickland: The measurement of upwelling and subsequent biological processes by means of the Technicon. Autoanalyzer and associated equipment. Deep-Sea Res. 14 (3), 381–389 (1967)
Caperon, J. and J. Meyer: Nitrogen-limited growth of marine phytoplankton—I. Changes in population characteristics with steady-state growth rate. Deep-Sea Res. 19, 601–618 (1972)
Caperon, J. and D. A. Ziemann: Synergistic effects of nitrate and ammonium ion on the growth and uptake kinetics of Monochrysis lutheri in continuous culture. Mar. Biol. 36, 73–84 (1976)
Conway, H. L., P. J. Harrison and C. O. Davis: Marine diatoms grown in chemostats under silicate or ammonium limitation. II. Transient response of Skeletonema costatum to a single addition of the limiting nutrient. Mar. Biol. 35, 187–199 (1976)
Davis, C. O.: Continuous culture of marine diatoms under silicate limitation. II. Effect of light intensity on growth and nutrient uptake of Skeletonema costatum. J. Phycol. 12, 291–300 (1976)
Dorsey, T. E., P. McDonald and O. A. Roels: A heated biuretfolin protein assay which gives equal absorbance with different proteins. Anal. Biochem. 78, 156–164 (1977)
Grant, B. R. and I. M. Turner: Light-stimulated nitrate and nitrite assimilation in several species of algae. Comp. Biochem. Physiol. 29, 995–1004 (1969)
Guillard, R. R. L. and J. H. Ryther: Studies of marine phytoplankton diatoms. I. Cyclotella nana Hustedt and Detonula confervacea (Cleve) Gran. Canadian J. Microbiol. 8, 229–239 (1962)
Lui, N. S. T. and O. A. Roels: Nitrogen metabolism of aquatic organisms. II. The assimilation of nitrate, nitrite and ammonium by Biddulphia aurita. J. Phycol. 8, 259–264 (1972)
MacIsaac, J. J. and R. C. Dugdale: Interactions of light and inorganic nitrogen in controlling nitrogen uptake in the sea. Deep-Sea Res. 19, 209–232 (1972)
Nelson, D. M. and H. L. Conway: Effects of light regime on nutrient assimilation by phytoplankton in the Baja California and Northwest Africa upwelling systems. J. mar. Res. 37, 301–318 (1979)
Parsons, T. R., M. Takahashi and B. Hargrave: Biological oceanographic processes. pp 105–111. New York: Pergamon Press 1977
Ryther, J. H.: Photosynthesis in the ocean as a function of light intensity. Limnol. Oceanogr. 1, 61–70 (1956)
Ryther, J. H. and W. M. Dunstan: Nitrogen, phosphorus and eutrophication in the coastal marine environment. Science, N.Y. 171, 1008–1013 (1971)
Strickland, J. D. H. and T. R. Parsons: A practical handbook of seawater analysis, pp 201–206 Fish. Res. Bd of Can., Bull. 167 (second edition) 1972
Vacarro, R. F. and J. H. Ryther: Marine phytoplankton and the distribution of nitrite in the sea. J. Cons. Int. Explor. Mer. 25, 260–271 (1960)
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Communicated by J. M. Lawrence, Tampa
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Anderson, S.M., Roels, O.A. Effects of light intensity on nitrate and nitrite uptake and excretion by Chaetoceros curvisetus . Mar. Biol. 62, 257–261 (1981). https://doi.org/10.1007/BF00397692
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DOI: https://doi.org/10.1007/BF00397692