The algal periodicity in Tjeukemeer during 1968–1978

The seasonal periodicity of algal numbers and biomass and of chlorophyll-a was investigated in the shallow, eutrophic, alkaline and peaty lake, Tjeukemeer, The Netherlands, during 1968–1978. Diatoms and Scenedesmus spp. were abundant throughout the whole period.Several blue-green algal species, occurring since 1971, usually dominated for most of the year. Relative abundance of algal species in Tjeukemeer during the study period were compared with that in 1955–1960.