Variability of finger patterns in groups of alien population of the Tobol region
Aim. To establish the presence of deviations in the structure of skin patterns among residents of the region of Western Siberia, which is distinguished by special natural conditions, which may indicate the effect of the phenomenon of selective accumulation of dermatoglyphic features. Materials and methods. The material for the work was the prints of the skin patterns of the hands of men and women born and living in the city of Tobolsk. The total number of examined 182 (men 100, women 82). The imprints of the skin patterns of the inhabitants of the south of the Tyumen region in the amount of 212 people (104 men and 108 women) were also studied. The prints of skin patterns were obtained by the “printing ink” method and processed according to standard methods. Mathematical and statistical processing of the obtained results was carried out using standard electronic programs. Results. The article presents the results of a study of the structure of the skin patterns of the fingers of the inhabitants of the region of Western Siberia, which is distinguished by a special geological structure, which received the name “Tobolsk Continent” as a result. In the dermatoglyphics of the distal phalanges of the fingers, it was found that ulnar loops and curls were most often encountered on the left of the first finger, and almost equally ulnar loops and whorls were found on the right. There was a high frequency of whorls on fingers II and IV, and ulnar loops on fingers III and V. There were arcs and radials, mainly on the second fingers. When comparing the indicators of dermatoglyphics of the inhabitants of the Tobolsk region and residents of the south of the region, a decrease in the frequency of curls on fingers I-III of the left hand and fingers III, IV of the right hand, a decrease in the frequency of ulnar loops on fingers II-IV of the right hand were found. Conclusion. The consequence of these differences was a decrease in finger and common comb counts - a simplification of patterns among residents, which may be associated with the special geomorphological conditions of the region and the manifestation of the phenomenon of selective accumulation of individuals with a certain dermatoglyphic constitution, optimal for the natural conditions of the place of residence.