LONG-TERM MONITORING OF RED-BACKED VOLES NUMBER IN MAGADAN NATURE RESERVE IN 1980-2021
The dynamics of the number of two background species of red-backed voles (Myodes (Clethrionomys) rutilus (Pallas, 1779) and M. (Cl.) rufocanus (Sundevall, 1846)) was being traced for the period of 42 year (1980-2021). We identified 12-13 number cycles, each lasting 2-4 years, in the population of northern red-backed vole and 9-11 cycles, each lasting 3-5 years, in the population of large-toothed red-backed vole. The diverse structure and quantitative characteristics of the cycle were revealed in both species of voles. The amplitude of inter annual fluctuations in the number of northern red-backed vole was about 12 times, in large-toothed red-back vole - 50 times. In general the number of northern red-backed vole about 2.5 times exceeded that, of large-toothed red-back vole. The number dynamics of the studied red-backed voles depended on a complex combination of intra-population (physiological state and demographic indicators) and external (weather and food supply) influencing factors.