Abstract
The composition and development of phytoplankton of highly mineralized Lake Klyuchik (Nizhny Novgorod Region) were considered. The lake is unique of having a distinct ecotone on hydrochemical parameters. The prevalence of diatom algae, which are dominant in the number of species (46% of the total species composition) and abundance indices, was revealed. The vertical distribution of algae development was the most heterogeneous in the ecotone zone. In the bottom layers of the ecotone there was a mass development of the centric diatom Cyclotella distinguenda Hustedt with uniquely high abundance (several ten million cells/l) and biomass (more than 130 g/m3).
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