| Popis: |
On the basis of 655 direct and indirect estimations of effective size (Ne) of rural populations, a map of the geographic distribution of Ne in northern Eurasia was constructed. A geographic cline of Ne was found, with its value decreasing by three orders of magnitude from the direction of southwest (the western Caucasus and Central Asia) to northeast (the coasts of the Sea of Okhotsk and the Bering Sea). The area of highest distribution density of mean Ne values was situated meridionally between the Ob and Yenisei rivers from the Arctic coast of Taimyr Peninsula to the eastern Sayany and the south Baikal regions. Another similar area covered the south Baltic region, Belarus, and northwestern Ukraine. The average effective population size in northern Eurasia was Ne = 211.6, the geometrical mean G = 176, the harmonic mean H = 147, and the modal value Mo = 102. These characteristics of effective population size indicate a considerable contribution of stochastic gene drift to the differentiation of the northern Eurasian gene pool and the geographic cline of the rate of gene drift in the subcontinent. By means of transformation of the Ne map, a map for the rate of stochastic gene drift (1/4Ne) in northern Eurasia was obtained. |
