The Influence of Extremely High Concentrations of Inorganic P at Varying pH on the Growth and Photosynthesis of Unicellular Algae
✍ Scribed by Prof. Dr. E. Steemann Nielsen; T. Rochon
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- English
- Weight
- 434 KB
- Volume
- 61
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
Abstract
An increase in the phosphate concentration due to severe pollution is without real toxic effect for the phytoplankton in eutrophic lakes, although the various species have a variable tolerance against high concentrations. Experiments on photosynthesis and growth were made with cultures of two algae, Chlorella pyrenoidosa and Nitzcshia palea, using phosphate concentrations much higher than ever found in nature. The tolerance decreases with rising pH. This seems not to be due to a higher ratio of secondary phosphate at a high pH. Nor is the rise in the osmotic pressure apparently the cause of the decrease in the growth rate at high phosphate concentrations.