Variable kinetics of silicon-limited growth in Thalassiosira pseudonana (Bacillariophyceae) in response to changed chemical composition of the growth medium
Olsen, S.; Paasche, E. (1986). Variable kinetics of silicon-limited growth in Thalassiosira pseudonana (Bacillariophyceae) in response to changed chemical composition of the growth medium. Br. Phycol. J. 21(2): 183-190
In: British Phycological Journal. British Phycological Society: London. ISSN 0007-1617; e-ISSN 2331-2238, more
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| Keywords |
Environmental effects > Salinity effects
Nutritional requirements
Population functions > Growth
Silicon
Bacillariophyceae [WoRMS]; Thalassiosira pseudonana Hasle & Heimdal, 1970 [WoRMS]
Marine/Coastal; Fresh water |
| Abstract |
The diatom Thalassiosira pseudonana Hasle & Heimdal was grown in batch culture in one artificial sea-water medium and one fresh-water medium over a range of orthosilicic acid concentrations. Growth rates and cellular silicon quotas were measured in the exponential growth phase. The half-saturation constant of silicon-limited growth was about 0 multiplied by 04 mu M Si(OH)4 in the marine medium and about 8 multiplied by 6 mu M Si(OH)4 in the freshwater medium, the maximum growth rate being about 2 multiplied by 75 d-1 in both media. Possible reasons for the difference in affinity for silicon in salt and fresh water include differences in pH, ion composition, and osmotic pressure. |
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