Further experiments with algal cultures for determining some properties of water of Lake Balaton

Felföldy, Lajos (1962) Further experiments with algal cultures for determining some properties of water of Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 29. pp. 85-93. ISSN 0365-3005

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Abstract

Studying the effect of chemical properties of water of Lake Balaton on photosynthesis in unicellular algae different results were obtained due to the physiological characters of test organisms. Experiments made with strain 7K Chlorella vulgaris Bejer. suggest the insufficiency of inorganic carbon sources because this strain requires free carbon dioxide for its photosynthesis. Photosynthetic activity of this strain is stimulated by decrease of pH in Balaton-water, because by this decrease free CO₂ is released. If, however, algal strains utilizing easily also the hydrocarbonates dissolved in water are used (eg. Coelastrum microporum Näg.) the increase of hydrogen ion concentration has no stimulating but, moreover, a retarding effect on photosynthesis. Considering that the algae living in the water of Lake Balaton are mainly basophilic, utilizing hydrocarbonates, that conclusion of the previous article reported in the introduction of this paper that the amount of inorganic carbon is insufficient in Lake-water, has to be revised. As the present investigations show, the water of Lake Balaton contains sufficient P and N reserves at a given moment for the photosynthesis of algae. Nor would it be correct to speak of insufficient carbon supply in the case of basophilic algal strains either. It should be pointed out on basis of these results that the characterization of natural water bodies by biological tests, especially by physiological experiments with algae is not simple, and the reliability of results greatly depends on the suitable physiological characters of the test organism.

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