[The spatial organization of winter bird communities in the East European and West Siberian plains].

The main trends in the territorial changes in winter bird communities and the environmental factors determining them were analyzed based on long-term counts in the East European and West Siberian plains. These trends are reduced to a decline in the winter avian complexes (in the number of species and individuals) in the north- and eastward directions and with a decrease in the degree of sheltering and feed reserves in the habitats associated with reduction in afforestation. The specific regional features of winter East European avian complexes are the larger number of species and individuals in the nemoral forest, forest-steppe, and steppe landscapes, and inland water bodies as compared with the West Siberian avian complexes, as well as an increased influence of the degree of development and agricultural transformation of landscapes.

[Classification of the avian summer population of the Western Siberian plain]. / Klassifikatsiia letnego naseleniia ptits zapadno-sibirskoi ravniny.

The proposed classification system reflects the difference between the three population systems: unbuilt land, built-up land, and aquatic-semiaquatic communities. Two superorder groups--north and median--further divided into types were recognized in each of the systems. Most types are divided into subtypes, classes, and subclasses (and sometimes genera of the population). The estimation of the power and generality of the influence of environmental factors (their variability correlates with heterogeneity of the avian population) has demonstrated that forestation of the territory is most significant in the first half of summer on the western Siberian Plain. The composition of the forest-forming species and zoning are less affected. The influence of moisture and hydration is 2-3 times less significant; mesorelief is 4-5 times less significant; and productivity (feeding capacity) and anthropogenic influence are 7-9 times less significant.

[The fleas of small mammals in the northern taiga of western Siberia]. / Blokhi melkikh mlekopitaiushchikh severnoi taigi Zapadnoi Sibiri.

Data on the species composition of fleas, their abundance and distribution on hosts and on territory are given. Changes in the species composition and abundance of fleas in the latitude and meridional directions are shown.