The study investigated the relationship between species composition and seasonal dynamics in the development of algal flora of the Andijan Reservoir. The peculiarities of how seasonal distribution influences species composition, as well as taxonomic structure and quantitative development, in leading complexes of microalgae species are revealed. The greatest species diversity (346 species) was detected in the summer, with the maximum development of algae in June, the smallest (73 species) in winter, and maximum development in December. The most common species are marked as well as the species occurring only in a particular season. The values of their quantitative development and comparative production characteristics are given.

Keywords: algoflora, seasonal dynamics, species composition, Andijan Reservoir, Uzbekistan

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