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The effect of water mineralization on zooplankton productivity in the reservoirs of the Akmola region is a very relevant study. The chemical composition of natural waters is inextricably linked to the composition and structure of the soil, which, in turn, was formed during the long evolution of the earth's crust under the influence of climate. Natural waters have a wide variety of qualitative and quantitative chemical composition. The basis for systematization in existing classifications are the amount of mineralization, the predominant component or group, the relationship between different values of concentrations of various ions, the presence of increased amounts of any specific elements of the gas and salt regimes. The relevance of the work is due to insufficient study of the fishing potential of medium-sized reservoirs in Northern Kazakhstan. The work aimed to study the mineralization of water as a factor determining the life of aquatic organisms. As a result of this research, data confirmed the position that the factors that determine the viability of marine organisms are the mineralization of water. To characterize zooplankton across the entire lake area, samples were taken, taking into account different stations. The number of individual organisms in the sample was determined. The degree of mineralization of lakes in the Akmola region was indicated. The correlation coefficient for features in the "mineralization – zooplankton abundance" pair was calculated as r = -0.96, and in the "mineralization – zooplankton biomass" pair r = -0.85. When analyzing the data obtained, it was observed an inverse relationship between water mineralization and zooplankton abundance. When water mineralization increases by 4.03% in July, the number of zooplankton organisms decreases from 170.03 to 152.6 thousand copies/m3. When the salinity of the Uyali - Shalkar lake water increases from 362 (May) to 508 mg/L (July), the zooplankton biomass decreases from 6.02 to 5.73 mg/m3.

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Authors' Contribution MQ conceived the idea, performed the experiments, wrote manuscript and compiled the first draft. MW and FC were the members of supervisory committee. MT analyzed the data. SF was lab incharge. AM supervised in Max-Planck Institute.ZA assisted and guided in lab work performed. MH helped in manuscript writing.ARA designed and susupervised the study.

The aim of the research was to develop a method for determining the species affinity of animal hair by determining its melting temperature. The research material was selected from hair samples of livestock and wild animals. We investigated 170 hairs of 16 animal species and humans. The hair melting point was determined by an automated system for melting temperature determination Opti Melt (MPA100). In the present study, we suggest that species affiliation can be effectively determined by examining physical properties of hair, in particular by determining its melting temperature. The hair melting temperatures for different animal species are in different ranges, but the initial melting points for hair of certain animal species are similar. For example, the initial melting point for cat, sheep, hare, rabbit, and rat hair ranged from 100 to 111 ° C, and the hair of the wolf, bear, and fox began to melt at 139.2 to 141.2 ° C. The results of this research make it possible to determine the species affinity of animals according to their hair melting temperature, which had not been done before. The proposed method yields rapid results and can be used as an auxiliary method in ambiguous cases in which data obtained by microscopic examination are insufficient. It will greatly facilitate the work of forensic specialists, enriching the arsenal of available methods.