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

Dautkul.
The Dautkul lake system, located at the beginning of the "former" delta of the 
Amudarya, is the largest and oldest limnic ecosystem in the Amudarya basin. It is marked on the 
map as Dautkul reservoir. The study of this system is of great importance, because, on the one hand, 
it helps to establish relationships within the basins in lakes located in extreme arid conditions, 
secondly, it helps to observe the transformation of ecosystems exposed to anthropogenic influence, 
and thirdly, it is reasonable to distinguish freshwater limnic ecosystems from freshwater limnic 
ecosystems in the conditions of acute shortage of freshwater in the Amudarya basin. provides an 
opportunity to develop a strategy of use. 
The Dautkul lake system is located along the river, 4 km north of the city of Nukus. formed. 
At that time, water fell into the lakes through the Dautkul system and fed the lakes located below it, 
namely up to the Kuskhanatau hill. The water level is variable and is characterized by significant 
fluctuations, often depending on the filling of the river with water. The boundaries of the system 
were constantly changing, its area varied from 1770 to 2250 ha. The greatest depth in the system 
was 5-7 meters in the Kuksu distribution, and unlike other distributions, its boundaries were well 
defined. In the lake, some moons are separated from each other by reeds 0.7-1.5 m high. Lakes are 
rich in aquatic plants. 
According to experts [69, p. 47-51], the main dominant of this ecosystem is reed (Phragmite 
saustralis), along the coast there are many examples of narrow-leaved sedge (Typha angustifolia L.) 
and sea hogweed (Bolbochoenus maritimus), mud of shallow lagoons underwater plant 
communities form dense thickets with urut (Myriophyllum verticillatum L.), as well as rdest 
(Potamogetonpectinatus L.) and (Potamogeton crispus L.) species. Reeds (Phragmites australis) 
make up 85% of the ecosystem of the watershed and in some places are in clumps. The height of 
reeds in such bundles reaches 200-400 cm. Among reeds, the growth of 90-100 cm tall narrow-
leaved sedges (Typha angustifolia L.) and reeds (Schoenoplectuslitoralis (Schrad.) Palla) was 
recorded. On the banks of the reservoir, specimens of hogweed (Bolbochoenusmaritimus) are rare. 
Underwater macrophytes consist of rdest (Potamogetonpectinatus L.) and (Potamogetoncrispus L.), 

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