The primary production of phytoplankton in Lake Balaton April-September 1972

Herodek, Sándor and Tamás, Gizella (1973) The primary production of phytoplankton in Lake Balaton April-September 1972. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 40. pp. 207-218. ISSN 0365-3005

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Abstract

The biomass of phytoplankton, the illumination and primary production were measured fortnightly at four depths. In the samples 108 alga species, 5 varieties and 1 form were found. Algae were counted by Utermöhl microscope. The biomass of each species and the total phytoplankton were calculated from the number of algae and from the volume of individuals. Until the middle of July the plankton was dominated by diatoms, the largest mass was formed by Cyclotella bodanica. Ceratium hirundinella became the dominating species first in the second half of the summer. The average biomass was 10.3 g/m². Transparency is very unstable in the lake, due to the frequent swirling up of the mud. In storm the primary production stops already at 1 m depth because of light insufficiency while after a long calm period in the clear water the deepest layer (3 m) exhibited the highest production. In general at the surface the production is inhibited be excessive illumination, the maximum is found at 1 or 2 m, and at 3 m the same mass of algae produced four times less than at 1 m, owing to the insufficient light. The mean production and the standard error of the mean during the four hours expositions were 118 ± 8 mg C/m². The average daily production was estimated to be 413 mg C/m², the primary production during the half-year to 76 g C/m². This primary production corresponds to that of the slightly eutrophic akes.

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