Hydrochemical characteristics and species composition of plankton in the lake Maybalyk in the vicinity of Astana city, Republic of Kazakhstan

The study describes the result of hydrochemical and bioindicational analysis of the lake Maybalyk. The investigations revealed the main patterns which regulate the influence of hydrochemical characteristics and intensity of anthropogenic impact on the species diversity, abundance, and formation of the structure of plankton organisms. The samples for hydrochemical analysis were taken at the side of housing development on the lake Maybalyk west side and at the center of the lake. The sampling for hydrobiological analysis was carried out with the use of watercraft and cone-shaped nets. The Pantle-Buck saprobity index was used for qualitative estimation of plankton, thus the hydrobiological characteristics of the lake were estimated. The L-micro program was used for photographing in order to determine the plankton species. For aquatic organisms their external and internal environments are the same, they get oxygen and biogenic elements from their environment. Therefore their count is directly proportional to the environment composition. The main influence patterns of hydrochemical characteristics of the lake water upon the abundance and morphology of aquatic organisms have been validated. In the process of hydrochemical analysis it has been shown that concentration of chlorides, sulfates and oil products exceeds the norm for fishery waters. The possible causes for exceeding concentration and ingress of heavy metals into the lake have been determined. A possibility to use the established patterns has been shown for bioindication of natural water quality and ecological state of a water body.