The assessment of the ecological state of the reservoir in the Spring Valley of Volgograd

This paper presents a biological method for assessing the ecological state of a water body. The reservoir «Gypsy Pond», located in the residential complex «Spring Valley» of the Sovetsky District in Volgograd, was chosen as the object of research. In the process of assessing the ecological state of the reservoir, a method of bioindication of water quality using algae according to T.Ya. Ashikhmina was used. This method is quite simple and accessible in its application. The definition is based on establishing a degree of organic pollution of a water body by identifying algae indicators for a specific state of the environment. According to the conducted biological studies, the following species were found: Reinhardt’s Chlamydomonas (Chlamydomonas reinhardtii), diatoms (Diatomeae), green euglena (Egulena viridis), Ulothrix (Ulothrix), navicula (Navicula rhynchocephalia), chlorella (Chlorella vulgaris). As a result, the analyzed reservoir can be attributed to a highly polluted one, since the dominant species indicate a strong contamination of the reservoir and belong to polysaprobic species. In addition, as a result of the mixotrophic feeding of green euglena (Egulena viridis) and Reinhardt’s chlamydomonas (Chlamydomonas reinhardtii), the water body is experiencing a lack of oxygen supply, the production of which occurs during photosynthesis, which causes the formation of unfavorable conditions for the existence of hydrobionts. It is also important to note that a project is currently being planned to fill up the studied water body, which can have a particularly negative impact in the current situation of shortage of fresh resources.