Science and Education in Karakalpakstan issn 2181-9203 Science Magazine chief editor

Science and Education in Karakalpakstan. 2023 №2/1 ISSN 2181-9203 
13 
urut (Myriophyllum verticillatum L.) and spiky urut (Myriophyllum spicatum). When the aquatic 
and coastal vegetation of the lake was studied, it was noted that it was covered with plants and had a 
high level of growth. 
The lake is shallow and consists of numerous clumps of reeds (Phragmitesaustralis). The 
bottom of the lake is muddy and sandy. Thick reed beds grow along the shore and form isolated 
clumps of dense reed beds in the lake's water area. The bottom is thickly covered with 
myriophyllum spicatum species. Above the bottom of the lake and on the surface of the water spiral 
spirogyra (Sphaerocysti) formed a light green layer. The vegetation cover of the coastal part of the 
lake was dominated by plants such as sedge (Kareliniacaspica) and heather (Tamarix hispida) [69, 
47-51 p.; 70, www.aknuk.uz.]. The dominant of this ecosystem is reed (Phragmites australis). It 
formed dense thickets and isolated islands. Underwater plants are represented by spiky urut 
(Myriophyllum spicatum). The species composition of the ecosystem is represented by only 2 types 
of aquatic plants. It is covered with reeds and its growth is high, and the coastal zone is also thickly 
covered with urut. The dominants of the coastal area are halophytes - plants such as sedge and 
sedge [69, p. 47-51; 70, www.aknuk.uz.]. 
3.2-
picture Geographical location of Dautkul (www.uzeconet) 
A change in the hydrological situation in the region, a sharp decrease in the total water flow 
of the Amudarya in the delta, as a result of the transition to another source of water supply led to the 
transformation of the lake system into a basin formed in the deepest water areas with a single water 
surface. Irrigation is carried out by pumping water from the Erkindarya canal and the tributaries of 
the Sapaqkul-Birkulok lake system. The water supply of the water basin is very irregular, as a result 
of which, even in a short period of time, there are sharp changes in the water level and significant 
changes in the area. vegetation was observed only in the open expanses of the plains. 
Not too high clarity is characteristic for Dautkul water. Sometimes it reached 3-4 m and 
more, water clarity decreased due to contamination with various debris on the shores of the lake and 
when approaching the dam, as well as strong bloom of algae. 
In the case of Dautkul (1995-2000 years) (Fig. 3.2), during the study of the seasonal 
dynamics of mixed substances, it was found that the content of seston in the water of the circular 

---