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5. Sexual dimorphism in populations of Southern Siberia: inter-group analysis

Sexual dimorphism in populations of Southern Siberia: inter-group analysis

Khomyakova I.A. (1), Balinova N.V. (2)

1) Lomonosov Moscow State University, Anuchin Institute and Museum of Anthropology, Mokhovaya st., 11, Moscow, 125009, Russia; 2) Federal state budgetary institution «Research Centre for Medical Genetics», Moskvorechie st., 1, Moscow, 115522, Russia

Khomyakova Irina A., PhD., ORCID ID: 0000-0002-2811-2034; irina-khomyakova@yandex.ru; Balinova Natalia.V., PhD., ORCID iD: 0000-0001-9493-6544, balinovs@maill.ru.

Abstract

Materials and methods. Studies groups are two groups of Tuvinians, Tsaatans of Northern Mongolia, southern (Altai Kizhi), and northern Altaians. All the measurements were made according to the rules of bioethics and protocols of informed consent, data was anonymized. Samples from the populations have been selected randomly. Anthropometric measurements were made with standard methods using GPM anthropometric instruments. The research program included measuring the longitudinal and transverse dimensions of the skeleton, the circumferences, the skinfold thicknesses at various points, the head dimensions. Differences in the mean values of characteristics and variances between male and female samples were calculated. The significance of differences was tested with the Student’s test and the Mann-Whitney test. The coefficients of sexual dimorphism (CSD) were calculated. To analyze intergroup differences, a canonical discriminant analysis was carried out; the Mahalanobis distance criterion was used as a complex multidimensional characteristic of sexual dimorphism. Results and discussion. Skeleton size (lengths of the body, leg, arm, and trunk, width of the shoulders), circumferences, and subcutaneous fat deposition in all samples have a high level of sexual dimorphism. Tuvinians and Altai Kizhi have the highest sexual variation in skeleton dimensions. This groups also have the largest Mahalanobis distances between males and females for a set of characteristics.

Keywords

human variability; somatology; Tuvinians, Tsaatans of Northern Mongolia; Southern (Altai Kizhi) and Northern Altaians

DOI: 10.32521/2074-8132.2018.4.023-033

Цит.: Khomyakova I.A., Balinova N.V. Sexual dimorphism in populations of Southern Siberia: inter-group analysis // Moscow University Anthropology Bulletin (Vestnik Moskovskogo Universiteta. Seria XXIII. Antropologia), 2018; 4/2018; с. 23-33