Abstract
There was a heavy bloom of a nitrogen-fixing blue-green alga Anabaenopsis raciborskii Wolosz. in Lake Balaton in September-October 1982. The authors studied the dynamics of the phyto- and bacterio- plankton of the lake by daily and weekly samplings. Some meteorological factors were also considered. It could be concluded that the causes of the bloom were accumulating nutrients being enriched just before the bloom-period suddenly washed into the lake by heavy rains, followed by windless warm days (water temperatures 26–29°C). An expressed correlation between bacterio- and phytoplankton indicates their close trophic relationship.

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