Results of genetic demographic investigation of three nations located in west Bryanskaya oblast (Klintsovskii, Klimovskii, and Starodubskii nations) are presented. A comparison is made with respect to a number of demographic parameters of "southern" (Krasnodar) and "northern" (Kirov) Russian populations. A low level of the Crow index, which is associated with a differential mortality rate, Im = 0.07, was established in the population studied. This fact significantly distinguishes the population of Bryanskaya oblast from other studied Russian populations. With respect to sex and age structure and the Crow index, the Bryansk population is comparable to the southern Krasnodar population, while in terms of level of isolation and inbreeding, the Bryansk population is similar to the northern Kirov population. Moreover, it was found that the Chernobyl meltdown in 1986 did not lead to any change in the genetic demographic situation in the three studied nations.
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