SPECIES COMPOSITION AND QUANTITATIVE FEATURES OF PERPHYTIC ALGAE COMMINITIES ON POTAMAGETON CRISPUS L.

Samples of Potamageton crispus L. were collected in different growing seasons of the plants and the species composition and quantitative feature of periphytic algae on them were investigated. Altogether 68 species of periphytic algae were found, involving 50 genera. The algae were categorized in the phyla of Bacillariphyta, Chlorophyta, Cyanophyta, Euglenophyta, Xanthophyta and Cryptophyta. The common dominant species were in Bacillariphyta and Chlorophyta. P. crispus L and the periphytic algae on it restricted each other's growth. The density and biomass of the periphytic algae showed a striking seasonal variation with the growth of P. crispus.