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For 35 years, from 1984 to 2019, in the southern Baikal region, observations of changes in the system of additional chromosomes of Korean field mouse (Apodemus peninsulae) were conducted in five regions. The number and structure of morphotypes of additional chromosomes remained statistically constant. Analysis of B chromosome systems demonstrates stability and low variability of statistical indicators over a 35-year period, as well as the lack of statistical differences between samples of different years. [ABSTRACT FROM AUTHOR]

New data on the karyological variability of Apodemus peninsulae mice (Thomas, 1906) in the Tyva Republic are presented. By the ratio of macro and micro B chromosomes in the mice we studied earlier in this region and in the present study, it became possible to isolate several geographical populations that combine a number of studied catch points of East Asian mice within the territory of the Yenisei River basin in the northern and southern directions from Kyzyl (Republic of Tyva). The frequency distribution of micro B chromosomes makes the most significant contribution to obtaining a differentiation pattern of populations of mice with B chromosomes by area. [ABSTRACT FROM AUTHOR]