Home – Home – Jornals – Contemporary Problems of Ecology 2023 number 1

Based on the results of winter bird surveys conducted in 70 habitats over 12 years, in the period from 1982 to 2002, a hierarchical classification and a structural graph of the similarity of ornithocomplexes of the southwestern plains of Western Siberia and Northern Kazakhstan were compiled. The hierarchical classification contains 3 types and 9 subtypes of the ornithocomplexes. The similarity graph (the spatial-typological structure of the ornithocomplexes) is constructed at the subtype level and is represented by three trends. The first, the most significant of these series is determined by the influence of urbanization, afforestation and partly by the development of the reed tier. The second series of territorial changes of ornithocomplexes is associated with changes in the built-up and anthropogenic feeding of residential habitats. The third row is formed under the influence of afforestation and overgrowth. The characteristics of ornithocomplexes subtypes are compared, which contain information on the three most numerous bird species (leaders in abundance), their share in the community, population density, as well as background species richness. Based on the assessment of the degree of coincidence of the similarity of ornithocomplexes and environmental factors, the hierarchy of the impact of the main anthropogenic and natural factors determining the formation of the winter bird population is established. Regional specifics and seasonal changes in the significance of environmental factors in the formation of winter ornithocomplexes of the Tobolo-Irtysh forest-steppe and steppe are established.