On the contradiction between the statistical parameters of population dynamics

A model simulating the dynamics of the field vole (Microtus agrestis) numerosity during one year was built. The purpose of modeling was to reproduce the values of population characteristics, averaged over a long period of field observations. It was found that long-term average population characteristics can not be observed in any one year of simulated population life. A model population with an average long-term dynamics of age structure can not sustain long-term population dynamics. Long-term average values of population characteristics contradict each other, because they are obtained by averaging data for different phases of population dynamics and composition of the population.