[Genotypic variability in populations of the mound-builder mouse Mus spicilegus Pet., 1882, at various life cycle stages]. / Genotipicheskaia izmenchivost' v populiatsiikh kurganchikovykh myshei Mus specilegus Peteny, 1882 na razlichnykh fazakh zhiznennogo tsikla.

Genotypic variability in two Moldovian populations of moundbuilder mice Mus spicilegus Pet. was examined at different stages of their life cycle--at the beginning of overwintering in mounds and in the middle of summer in agrocenoses. Thirty allozymes were assayed. Significant differences in allele frequencies and heterozygosity between overwintered and mice born in the year of the experiment were recorded only for Idh-1. This fact was related to the presence of differential mortality among overwintered mice in the populations by the middle of summer. The increase in heterozygosity for Idh-1 in the populations occurred because of "old" mice that lived until the middle of summer, at which point they still have not contributed to the gene pool of the population. The genetic effect of the annual separation of generations of mound-builder mice due to their overwintering in mounds is analyzed. Overwintering has a bottleneck effect on the population. The relatively low genetic variability in mound-builder-mice populations is considered with regard to their biological and ecological features. Based on obtained data, a conclusion on the high genetic stability of moundbuilder-mice populations during their entire life cycle is made.

[Population-genetic variability of the house mouse Mus musculus L. 1758 S. stricto from the western, central, and southeastern area of species range]. / Populiatsionno-geneticheskaia izmenchivost' domovykh myshei Mus musculus L. 1758 S. stricto iz zapadnoi, tsentral'noi i iogo-vostochnoi chastei areala vida.

Allozyme variation in nine populations of the house mouse Mus musculus L. s. str. was examined. Twenty-five out of 34 analyzed loci were shown to be polymorphic. Estimates of genetic variation were obtained for separate populations and for population groups classified according to their habitat. Populations from Moldova and Tadzhikistan displayed the lowest and highest amounts of allozyme variation, respectively. Variation in town populations was significantly greater than in rural ones. This can be explained by active human-induced migration of mice into towns. All Central Asian populations showed high levels of genic diversity, which is presumably related to their proximity to ancient centers of mice expansion. Allelic distributions in the populations were analyzed.