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The Influence of Extremely High Concentrations of Inorganic P at Varying pH on the Growth and Photosynthesis of Unicellular Algae
Author(s) -
Nielsen E. Steemann,
Rochon T.
Publication year - 1976
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.3510610402
Subject(s) - chlorella pyrenoidosa , phosphate , photosynthesis , algae , eutrophication , phytoplankton , environmental chemistry , chemistry , botany , osmotic pressure , chlorella , biology , nutrient , ecology , biochemistry
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.