Analysis of population dynamics of small mammals

The influence of intrapopulation and external factors on the numbers and structure of bank vole populations were estimated quantitatively based on the data of long-term studies on four different sites of its range. The abundance - dependent regulator mechanisms (endogenic factors) are shown to be the major factors affecting the demographic processes during the whole reproductive period. The exogenic (fodder and weather) factors limit the growth of populations. These factors are the most effective during some small confined periods, particularly in the peripheral areas of the vole's range. Such distribution of effects on the bank vole population is not related to the quality of habitat and its geographical range.