Maurer Andrey Markovich

Introduction. This work is devoted to the study of some aspects of age and (or) temporal variability of a number of morphological features of the head and face in the adult Chuvash population in Bashkiria. The objectives of the study were to analyze and assess the presence and degree of morphological changes on the skull of an adult according to a number of signs included in the program on ethnic anthropology, as well as to study their possible connection with age-related transformations or acceleration of development and secular trend.

Materials and methods. The surveys were conducted in two districts of Bashkiria, Aurgazinsky and Bizhbulyaksky, in villages with a predominantly Chuvash population. The material was collected in 1999, in total, data were obtained for 361 men and 352 women born from 1915 to 1980. The paper studied the temporal and age variability of the following features: longitudinal, transverse, zygomatic and mandibular dimeters, the smallest width of the forehead, measured the morphological height of the face (from the nasion) and the circumference of the head, calculated the head index. The material was collected by the same researcher. The data were divided into 11 age groups in increments of 5 years, starting in 1925. In each group, the average values of the features and standard deviations were calculated. For all signs, scatter diagrams of the values of signs vs year of birth are presented.

Results and discussion. The most stable signs in terms of age were the minimal width of the forehead, head circumference and mandibular diameters. The magnitude of the head index varies significantly due to age-related changes in the transverse and longitudinal diameters of the head, which determine the magnitude of the index. The age-related decrease or stable condition of the head pointer, according to G.L. Hit’ [1968], contradicts our observations. For most indicators, with the exception of morphological height of the face and zygomatic diameter, no pronounced changes were found, which may be due to local features of the development of the examined group.

Conclusion. The conducted studies have shown that for a more thorough study of the problem under consideration, it is necessary to attract additional materials collected at different times and under different environmental conditions for a close group (for example, in stable populations of Khalkha Mongols). © 2023.This work is licensed under a CC BY 4.0 license.

Introduction. The article presents the results of the development data on kefalometry of the complex South Sinai anthropological expedition.

The purpose was to study the variability of cephalometric traits in South Sinai Bedouins. Objectives: to identify possible phenotypic differences between the tribes, to assess the position of the Bedouin tribes against the background of the Middle Eastern and North African populations according to literary data; to create male composite photo portraits (CPP) from Bedouin tribes Awlad Said and Gebeliya.

Materials and methods. Cephalometric data from three tribal samples were used: the tribes of Gebeliya, Muzeina and the combined group "other tribes", which includes data on the Awlad Said tribe. To identify intertribal differences, analysis of variance was applied. Literature data on Middle Eastern and North African samples were used for comparative analysis by the method of multidimensional scaling. To create composite photographic portraits (according to F. Galton´s method), an improved program "Face to face" by Syroezhkin-Maurer (by superposition of three points) was used. Full-face and profile individual Bedouins photographic images from the tribes of Gebeliya (N = 21), Awlad Said t (N=21) and Muzeina (N=19, only frontal) were selected for the work.

Results. Statistically significant differences between the Bedouin tribal samples were revealed in such traits as: minimal forehead breadth and mandibular diameter, facial index, height of the lower facial segment and head circumference. Composite full-face and profile photo portraits of Bedouin men of the Awlad Said and Gebeliya tribes, full-face portraits of representatives of the Muzeina tribe were obtained. The results of biometric analysis on the latitudinal traits of the face partly coincide with the analysis of visual information on composite photo portraits. According to the measurement data of the face and head, it was revealed that Bedouin tribes form a compact cluster that differs from neighboring populations.

Conclusion. In the male part of the combined Bedouin sample, for a number of cephalometric features, significant intertribal differences were revealed both by statistical methods and visually (when considering full-face and profile male composite photo portraits). It is shown that endogamous Bedouin tribes of the South Sinai Peninsula are very close to each other by a combination of cephalometric traits, and they significantly different from other neighboring populations. The South Sinai Bedouins form a kind of unique aggregation, whose peculiarity, probably, was formed under the influence of certain socio-historical and environmental factors. © 2023. This work is licensed under a CC BY 4.0 license

Introduction. A number of studies have shown that the Khalka rural pastoral population of Mongolia leading a traditional lifestyle is not characterized by acceleration of development and a secular trend in somatic characteristics of the body. The purpose is to study the morphological variability of head and face features in the adult rural Khalkha-Mongolian population against the background of variability of the same features in the Chuvash group and try to catch acceleration trends based on measuring head features.

Materials and methods. The data (370 men and 355 women aged 18-60) was obtained during anthropoecological expeditions in 1986-1990 in 4 Khalkha-Mongolian somons. As a comparative material, data on the Chuvash of Bashkiria were used. Regression analysis was applied. The age-related variability of normalized values of cephalometric traits was assessed using variance analysis. For the Mongolian and Chuvash populations, the coefficients of sexual dimorphism of individual features of the face and head (according to V. Deryabin`s formula), as well as the Mahalanobis distance between female and male samples were determined.

Results and discussion. For the studied characteristics (head length and breadth, the minimal forehead breadth and facial breadth, face height, facial and head indexes) in men, no reliable links were found between the variability of these traits and age. Variance analysis of normalized values of cephalometric signs revealed no differences in either the male or female Mongolian sample. The Mahalanobis distances calculated from the complex of head and face signs between the female and male Mongolian subsamples are noticeably smaller than the corresponding values obtained for the Chuvash group.

Conclusion. Comparative studies of the age dynamics of a number of measuring features of the head for about one and a half generations of the twentieth century in Khalkha-Mongols (adapted groups) and Chuvash (populations with impaired adaptation due to changes in socio-economic environmental factors) showed weakly pronounced morphological changes in the features on the head and face in the studied population groups. There were no significant age differences in the complex of features of the face and head in the Khalkhas populations. Data on sexual dimorphism of facial and head features in Mongols and Chuvash have been introduced into scholarly discourse, and in the Mongolian population the values of indicators of sexual dimorphism of cephalometric signs are less than in Chuvash sample. © 2023. This work is licensed under a CC BY 4.0 license.

Introduction. This research examines and evaluates the comparability of a specific set of anthropometric measurements of facial features obtained through direct measurements and frontal portrait photographs. With the growing trend towards utilizing photography instead of direct measurements, the question of the convergence and comparability between these two methods has become increasingly significant.

Materials and methods. The study was conducted on a sample population of Chuvash individuals, who represent the indigenous population in the Chuvash Republic of the Russian Federation. The material for the study comprised cephalometric data and anthropological photographs of individuals from the Chuvash Republic, surveyed during the 2002 expedition under the guidance of V.A. Batsevich. The sample size consisted of 72 individuals, with 35 women and 37 men. Prior to statistical analysis, the male and female participants were divided into two age groups to account for potential age-related variations. Statistical analysis was conducted using the SPSS software package, applying Cronbach's alpha method.

Results. In this study, gender differences were identified for a range of anthropometric indicators, demonstrating high convergence when employing two facial measurement methods. The obtained values of dimensions were generally comparable in terms of reliability and consistency. 

Conclusion. The research has revealed that the method of obtaining linear facial dimensions from portraits can serve as an analog/alternative to direct anthropometric measurements. In men, latitudinal dimensions are better correlated with each other, whereas in women they are high-altitude. The obtained results align well with existing data on this topic, highlighting the potential viability of facial portrait-based measurements in anthropometric studies. © 2024. This work is licensed under a CC BY 4.0 license