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The seasonal and multi-annual changes in numbers and demography of the population of Clelhrionomys glareolus (Schreber, 1780) in nine different stands which differed in spatial structure and plant species were analyzed. The density and distribution of the undergrowth influenced the density and demography of the population. On plots where the undergrowth was more evenly distributed (random) there was a higher density than on plots where it was clustered. The multi-annual cycle showed a synchronizatio n of density changes (across all plots). The number of sexually active males and females decreased as the clumping of undergrowth increased. The number of recruits to the population was proportionate to the number of sexually active females at the beginning and end of the reproductive season. In late summer there was a decrease in recruitment to the population, especially on plots with randomly distributed undergrowth. The number of recruits to the population in a given trapping series was inversely related to the number of individuals persisting from the previous trapping series. The higher survival rates of individuals marked in the early summer on plots with random dispersion of undergrowth caused the age structure of the individuals on these plots to "become older" than on plots with clustered undergrowth. These results are in agreement with Anderson's model for utilization of habitats along a decreasing gradient of suitability for the bank vole and indicate that processes regulating the population most effectively occur early in the season.

acta theriologica

Book review. Domestic animals from the zoological perspective. W. Herre, M. Röhrs, 1990: Haustiere - zoologisch gesehen. Stuttgart and New York, Gustav Fischer Verlag. 415 pp