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In the period 1990-1994 the average biomass of phytoplankton increased from 2.9 to 9.9 mg dm-3. In 1990 Cryptophyceae dominated (29% of total biomass), in 1991-1993 Bacillariophyceae (20.5-35%), and in 1994 Cyanophyta (39%). On the turn of winter and the beginning of spring a mass development of the diatoms Asterionella formosa Hass., Cyclotella sp., and Stephanodiscus hantzschii Grun. occurred every...
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