[The dynamics of tundra vole populations and accumulation of natural radionuclides in the territories with increased level of radioactive pollution].

The analysis of natural radionuclide (226Ra) contamination and tundra vole (Microtus oeconomus Pall.) relative number (from the sixties of 20-th century to 2007) reveals the impotent role of murine rodents in radionuclide migration. As a result of their pawing and of radionuclides carry-over by plants on the soil surface since the beginning of 1990 to present time the increase of 226Ra content in animals from control and radioactive plots have been ascertain. In the plots under study tundra vole number was half as much from 1993 to 2007. Simultaneous rotation of population cycle stages noticed in the control plot and in the plot with radium contamination, and long periods of low number was recorded in the plot with radium and thorium contamination, which are typical for border and impact populations.