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Inbreeding patterns in La Cabrera, Spain: dispensations, multiple consanguinity analysis, and isonymy
María José Blanco Villegas1, Alessio Boattini, Humildad Rodríguez Otero
1Facultad de Biología, Universidad de Salamanca, Salamanca, Spain.
Human Biology
|September 14, 2004
Summary
This study in La Cabrera, Spain, found exceptionally high rates of consanguineous marriages, with inbreeding levels peaking between 1900-1959. Population size changes and geographic factors significantly influenced these historical inbreeding trends.
Area of Science:
- Population Genetics
- Human Ecology
- Social History
Background:
- Isolated regions often exhibit unique demographic patterns.
- Understanding historical inbreeding is crucial for population genetics and health studies.
- La Cabrera, Spain, presents a unique case for analyzing long-term marital structures.
Purpose of the Study:
- To analyze marital structure and inbreeding coefficients in La Cabrera, Spain.
- To investigate the historical trends and influencing factors of consanguinity.
- To compare inbreeding patterns at regional and parish levels.
Main Methods:
- Analysis of 5,714 marriages from 1880-1989.
- Calculation of inbreeding coefficients (alpha3, alpha4).
- Examination of kinship-type frequencies and isonymy analysis.
Main Results:
- Consanguineous marriages reached 23.05%, with multiple consanguineous marriages at 5.43%.
- Inbreeding values are the highest recorded in Spain and Europe.
- Inbreeding peaked from 1900-1959, declining rapidly after 1960, linked to population size.
- Geographic subdivision (Wahlund effect) and demographic factors influenced inbreeding structure.
Conclusions:
- La Cabrera exhibits exceptionally high historical inbreeding.
- Population size dynamics and geographic factors are key drivers of inbreeding.
- While social factors play a role, they are secondary to demographic and geographic influences.