The change in the population structure of the Kursk and Voronezh Guberniya in the first half of the 20th century. Malecot’s isolation by distance

The article presents the results of assessing the variability of parameters of the Malekot’s distance model of isolation among the population of Kursk and Voronezh guberniya from 1890–1910 to 1951–1953. Over 60 years there was an increase in the level of local inbreeding (2.8 times), root-mean-square distances between the places of birth of spouses, taking into account long-distance migrations (3.7 times) and without them (5.44 times) and a decrease in the effective population size (2.8 times), the coefficient of linear systematic pressure (4.5 times).