Horizontal plankton investigations in Lake Balaton. VII. On the phytoplankton of Lake Balaton, based on scooped samples and filtrates taken in 1966

Tamás, Gizella (1969) Horizontal plankton investigations in Lake Balaton. VII. On the phytoplankton of Lake Balaton, based on scooped samples and filtrates taken in 1966. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 36. pp. 257-292. ISSN 0365-3005

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Abstract

The author studied 413 scooped and 112 filtrated plankton samples taken from 15 localities of the 5 standard transverse sections of Lake Balaton, in the period May-November, 1966. The 165 identified species, 17 varieties, and 3 forms belong, together with the aquatic fungi, to 6 systematic phyla, in the order of frequency of occurrence, to the Chrvsophvta (78), Chlorophyta (70), Cyanophyta (15), Euglenophyta (14), Pyrrophyta (5), and Mycophyta (3). Of the 15 localities, the August sample deriving from section Szigliget-Balatonmária was the richest both as to the number of species (63) and individuals (1,718,820/liter). The poorest in the number of species (21) was the May sample from Szigliget-Balatonmária, and in the number of individuals (20,250/liter) the November sample from Balatonalmádi-Balaton világos. Deviating from the situation in the preceding year, it was phylum Cyanophyta which reached the highest individual numbers (1,475,730/liter) in the August sample of section Szigliget-Balatonmária. This high value referred to the water-bloom of Aphanizomenon flos-aquae var. Idebahnii, extending from Keszthely-bay on even beyond section Szigliget-Balatonmária, in the entire width of Lake Balaton. The immense mass of this filamentous blue-green alga relegated all other algal species to the background. During the time of the water-bloom, the presence of the aquatic fungus, Phlyctidium globosum Sk u ja , in the spores of Aphanizomenon was also significant, causing an infection of about 1 per cent.

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