CONTRIBUTION OF GREEN-ALGAE TO THE PHYTOPLANKTON ASSEMBLAGE IN A MESOTROPHIC LAKE, MONDSEE, AUSTRIA

Data on green algal populations of the phytoplankton assemblage from mesotrophic lake Mondsee, Austria, have been analysed for an eight year period (1982-1989). Some 20 species were observed of which three gained greater importance (two species of Chlamydomonas and Cosmarium depressum var. planctonicum). Contribution of green algae to total biomass never exceeded 10%. Periodic changes and seasonality are broadly repeated every year for several individual species. Large variations in abundance occur between years. Losses seem to be primarely due to grazing since sedimentation is of minor importance.