Inbreeding patterns in La Cabrera, Spain: dispensations, multiple consanguinity analysis, and isonymy

Human Biology
Maria José Blanco VillegasDavide Pettener

Abstract

Marital structure and inbreeding coefficients were analyzed in La Cabrera, an isolated mountain region in northwestern Spain. A total of 5,714 marriages were celebrated from 1880 to 1989 in the 37 parishes of the area. The total frequency of consanguineous marriages (up to the fourth degree) is 23.05%; multiple consanguineous marriages are remarkably common, reaching 5.43% of the total. The first cousin/second cousin ratio (referred to as kinship-type frequencies) is 0.43. The inbreeding values are the highest recorded in Spain and in Europe: alpha3 is 4.82 x 10(-3) for the whole period and alpha4 is 6.78 x 10(-3) for 1880--1919. The temporal trend of inbreeding shows high values (alpha3 > 4.5 x 10(-3)) for a particularly long period (1900--1959) and a rapid decline from 1960 onward. This historical inbreeding trend is clearly related to changes in population size. The frequencies of multiple consanguineous marriages and the analysis of isonymy show that the inbreeding structure is related to geographic and demographic factors. Comparing the results at two hierarchical levels (La Cabrera as a whole and the 37 parishes individually), we conclude that the inbreeding values are affected by internal geographic subdivision of the po...Continue Reading

Citations

Sep 6, 2005·Annals of Human Genetics·A H Bittles, I Egerbladh
Jul 7, 2011·Journal of Biosocial Science·Claudio F Küffer, Sonia E Colantonio
Aug 19, 2006·American Journal of Human Biology : the Official Journal of the Human Biology Council·Alessio BoattiniDavide Pettener
Nov 22, 2017·Human Nature : an Interdisciplinary Biosocial Perspective·R CalderónP Cuesta
Nov 10, 2006·Annals of Human Biology·M J Blanco Villegas, V Fuster
Aug 31, 2021·Annals of Human Biology·Alessio BoattiniDavide Pettener

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