The primary production of phytoplankton in the Keszthely Basin of Lake Balaton in 1973-1974

Herodek, Sándor and Tamás, Gizella (1975) The primary production of phytoplankton in the Keszthely Basin of Lake Balaton in 1973-1974. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 42. pp. 175-190. ISSN 0365-3005

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Abstract

The illumination, composition, biomass and production of the phytoplankton were studied in the basin in 25, 100, 200 and 275 cm depths a whole year through. In most cases less than 10 per cent of the surface illumination was found at 1 m depth, and less than 1 per cent at 2 m depth. Due to the shading by the algae the rich submerged vegetation of the previous years has been extinguished from the deeper regions of the basin. The biomass was much larger than in th e previous years, its maximum attaining 12.6 g fresh weight • m⁻³. In July strong water bloom was caused by Aphanizomenon flos-aquae and Anabaena spiroides, in August Ceratium hirundinella dominated, while in the colder water diatoms prevailed. The amount of algae shorter th an 10 /µm correlated inversely with temperature. Usually the production was the highest in the uppermost sample, it was reduced about to the half for 1 m and to a few per cents for 2 m depth. The production was extremely intensive in summer. In July 1.1 mg C • litre⁻¹ • • hour⁻¹ production was measured at the optimal depth, and the daily production was estimated to 13.6 g C • m⁻². The annual production amounted to 831 g C • m ⁻². Comparison with earlier data suggests, that it happened in the last twelve years that the basingot from a moderately eutrophic state to th e strongly hypertrophic one.

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