title: [Population structure of forest Nentsee. II. Results of a geneologic study].
abstract: Inbreeding and its effect on fertility have been investigated in small (N approximately 1500) population of fisherman, hunters and reindeer breeders living in Northwestern Siberia. Average coefficient of inbreeding in total population was found to be 0.012, ranging from 0.003 to 0.016 between six subisolates. 8% of the total number of matings were matings between close relatives of uncle-niece, first cousins and double first cousins type. Nine polygamic matings were observed among presently living males belonging to elder generation. Comparative analysis of fertility in women whose reproduction had been completed was performed for 64 consanguineous and 120 non-consangineous matings. Insignificant decrease of average number of live births and surviving children was observed in matings of uncle-niece type and could be attributed to the greater number of sterile couples than in control matings. No differences have been observed when consanguineous matings of first cousins type were compared with control families with almost the same proportion of sterile couples. It can be concluded that if inbreeding has any distinct effect on fertility in families in the Forest Nentsee, this happens mainly as a result of increased proportion of sterile matings in inbred part of the population.
mesh_terms: D003241:Consanguinity; D005006:Ethnicity; D005260:Female; D005298:Fertility; D006801:Humans; D008297:Male; D010375:Pedigree; D012800:Siberia
vernacular_title: Populiatsionnaia struktura lesnykh nentsev. Soobshchenie II. Rezul'taty genealogicheskogo izucheniia.