RESTORATION OF THE MIDDLE-IRTYSH POPULATION OF EUROPEAN BEAVER
As a result of reintroduction of individuals of Eastern European and Belarusian subspecies of European beaver populations, Middle-Irtysh population has formed. It is possible to single out 5 stages in its development, each of which has its individual statistical and mathematical characteristics: adaptation (1953-1966), recovery (1967-1975), constraining the sequence (1976-1988), depression (1989-2000), expansion (2001-2012, not finished). Complete restoration of the European beaver range in the region is not reached, since the introduction of commercial hunting led to number depression and number dilution of the range. That is why the quantitative and spatial development of the Middle-Irtysh European beaver population has been delayed for 25 years.