Comparative study on distribution of bacillariophyta, cyanophyta, chlorophyta and euglenophyta along the stream of Kashkadarya river (Uzbekistan)

Аннотация

During 2009–2017 years 150 algological samples were collected along the stream of Kashkadarya River, which are preserved in the Collection of algae and soil of Uzbekistan” of the Institute of Botany of the Academy of Science of Uzbekistan. Because of the conducted researches 54 indicator saprobic species of Bacillariophyta were found, 10–Cyanophyta, 9–Chlorophyta, and 1–Euglenophyta. All divisions in total have 75 species and varieties (68 species, 6 variations, 1 form). Comparative study has been conducted on their distribution along the upper, middle and lower river stream in 8 monitoring points. It has been established that the number and variety of indicator saprobic species of all divisions decrease which is connected with the influence of anthropogenic factors. It has been also proved that along the river stream on monitoring stations xeno and oligosaprobic indicators decrease (8, 11, 7, 14, 6, 6, 5, 4), and beta- and alfa-mesosaprobic species are more in number (12, 11, 6, 12, 9, 12, 9, 6).