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Growth of the plankton diatom Thalassiosira nordenskioeldii Cleve at low silicate concentrations
Paasche, E. (1975). Growth of the plankton diatom Thalassiosira nordenskioeldii Cleve at low silicate concentrations. J. Exp. Mar. Biol. Ecol. 18(2): 173-183. hdl.handle.net/10.1016/0022-0981(75)90072-6
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981, more
Peer reviewed article  

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Keywords
    Growth; Silicates; Thalassiosira nordenskioeldii Cleve, 1873 [WoRMS]; Marine

Author  Top 
  • Paasche, E.

Abstract
    The combined effect of low Si conc and temp on the growth of T. nordenskioeldii was investigated by means of batch and semi-continuous cultures. Growth rates were measured in thin cell suspensions (< 500 cells/m) to prevent the Si conc in the medium from decreasing by > 25% during the period of measurement. 0.5-saturation constants of Si- limited growth were calculated according to the Michaelis-Menten equation. At 3°C, the constant was 0.09 {mu}g-at Si/l and at 10°C, 0.02 {mu}g-at Si/l. In semi-continuous cultures grown for 1 month at Si concs of 0.3-0.4 {mu}g/at Si/l, the mean cell division rates were 80- 100% of the maximum rates recorded at the respective temps. It seems unlikely that decreasing Si concs could influence the course of the spring succession of plankton diatom spp in arctic or temperate coastal waters.

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