The small mammal daily activity in the population cycle different phases of the spieces dominating in the community

The research results on the variability phase component identification of the bank vole (Clethrionomys glareolus) and northern red-backed vole (Cl. rutilus) specimen daily activity are presented in the article. The established density-dependent changes of the daily activity rhythms, according to the authors’ view, are connected with changes of population spatial structure, occurring during the number dynamics.