The research was conducted in the spring-summer period of 2021 on the territory of northern Kazakhstan, where the Pavlodar region is located. The features in the sexual and age structure of populations were considered. Populations live in the vicinity of two large heavy industry enterprises and a control area. The sources of anthropogenic impact were the Pavlodar Aluminum Plant and the Kazakhstan Electrolysis Plant. Research objective: to determine the dependence of the sex and age structure of small mammals on the proximity to the source of anthropogenic pollution of the area. The study area was divided into impact, buffer, background and control. Conclusions were drawn about the permanent effect of pollutants on the micromammalia organisms. There is a violation in the ratio of the number of females and males in the populations as they approach the sources of pollution. There is an increase in reproduction of individuals. The fertility of females of technogenic territories is higher than the control ones. The percentage of fingerlings, adults and overwintered animals differs. The impact territories have the largest number of young organisms and the smallest number of overwintered micromammalia. In the control area, there is a predominance of adults and pre-hibernating individuals. The age group of animals was determined by weight, body size, relative qualities (condition of the coat). There was no up-to-date information on the impact of anthropogenic impact on the gender and age structure of communities and populations of northern Kazakhstan. The results of this research will be useful in the process of planning a residential area of the region.

Accounting methods for the number of organisms are divided into absolute and relative. The article provides a comparative assessment of the relative methods for small mammals catching. There is theoretical and practical information on the method of accounting using crushers and the method of trapping grooves in the article. The article presents the methodological aspects of using Gero traps and trapping cylinders and a comparative assessment of the results of using two methods of accounting in a sharply continental climate and steppe habitat of micromammals. Recommendations are given on the use of relative methods of accounting for terrestrial chordates. The study continued throughout 2020, 2021 on the territory of the Pavlodar region in areas with an increased anthropogenic impact and the territory located 100 km from the nearest cities and factories. When using the trap method, there is a wide variety of species caught and there are more of them compared to the crusher method. The temporal characteristics of the use of accounting methods are considered: the peak of indicators is observed in the spring-summer period, namely from May to August in both methods of accounting for the number of mammals. Biotopes located far from large settlements have higher species diversity in comparison with the habitat near industrial plants. On the territory of the Pavlodar region, the advantage of using the method of trapping grooves was established in comparison with the method of crushers when taking into account small mammals.