In general, Hormogonales were very scarce in the
lake. Picocyanobacteria, mostly Synechococcus sp., have been found throughout
the year, with peak abundances in summer and fall, but make only a minor contribution
to total phytoplankton biomass (Malinsky-Rushansky et al, 1995).
In mid-August 1994, perceptible numbers of Aphanizomenon ovalisporum
Forti filaments began to appear in the lake. By early October, A.ovalisporum
dominated the phytoplankton, reaching a chlorophyll concentration of -20 u.g I"1
and constituting 88% of the total biomass.