ASSESSMENT OF THE ECOLOGICAL STATE OF WATER IN THE SPRING VALLEY OF VOLGOGRAD
The article presents a biological method for assessing the ecological state of a water body. The Сyganskij Pond of the Sovetsky district of the city of Volgograd was chosen as the object of research. The purpose of the work is to assess the ecological state of the reservoir in the Spring Valley of Volgograd. According to the conducted biological studies, the studied reservoir belongs to a highly polluted one, which is due to the constant presence of polysaprobial species. The presence of Reinhardt's chlamydomonas (Chlamydomonas reinhardtii), Euglena green (Euglena viridis), which have a mixotrophic type of nutrition, indicates a lack of oxygen supply to the reservoir due to nutritional characteristics. Consequently, the formation of unfavorable conditions for the existence of hydrobionts is caused