BIONOMICS AND ECOLOGY OF APODEMUS-AGRARIUS (PALL) (RODENTIA, MURIDAE)ON VYCHODOSLOVENSKA NIZINA LOWLAND .2. POPULATION-STRUCTURE AND DENSITY

The population structure of the black-striped field mouse (Apodemus ag rarius) is analysed in the conditions of the intensively exploited agr icultural landscape of the Vychodoslovenska Nizina lowland. During sta tionary research (1986-1991), 1585 individuals of A. agrarius were cau ght. In the total catch a statistically significant predominance of ma les (53.2%) was noticed which was more significant in the breeding sea son. The variation of the average weight of the mature individuals was analysed. Distinct annual variations of population densities in A. ag rarius as well as high frequency of samples with very high densities a re connected with the crowding character of the species.