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Inbreeding in Finland.

L B Jorde1, K J Pitkänen

  • 1Department of Human Genetics, University of Utah School of Medicine, Salt Lake City 84132.

American Journal of Physical Anthropology
|February 1, 1991
PubMed
Summary
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First-cousin marriage in Finland was infrequent between 1810-1920, with rates below 1%. Cultural factors like ethnicity and occupation, not geographic or population density, best predicted consanguinity levels.

Area of Science:

  • Human Genetics
  • Social Sciences
  • Demography

Background:

  • Consanguineous marriages, particularly first-cousin unions, are a significant factor in human inbreeding.
  • Understanding the determinants of consanguinity is crucial for studying population genetics and social behaviors.
  • Previous research often focused on 'mate availability' factors to explain marriage patterns.

Purpose of the Study:

  • To quantify the frequency of first-cousin marriages in Finland from 1810 to 1920.
  • To identify the key predictors of first-cousin marriage frequency at the parish level.
  • To evaluate the roles of cultural versus 'mate availability' factors in consanguinity.

Main Methods:

  • Analysis of historical marriage records (1810-1872) and national statistics (1878-1920).

Related Experiment Videos

  • Calculation of marriage frequencies and average kinship coefficients.
  • Application of logistic and linear regression models using variables like ethnicity, occupation, and geographic distance.

    • Main Results:

    • First-cousin marriage frequency in Finland was low, decreasing from 0.315% (1810-1872) to 0.174% (1878-1920).
    • Average kinship coefficients were very low (0.00020 and 0.00011).
    • Parish ethnic composition and husband's occupation were the strongest predictors of first-cousin marriage, outperforming factors like population density or urban/rural residence.

    Conclusions:

    • Inbreeding due to first-cousin marriage in Finland was historically low.
    • Cultural factors, specifically ethnicity and socioeconomic status (occupation), are more significant determinants of first-cousin marriage than commonly assumed 'mate availability' factors.
    • This highlights the importance of cultural context in understanding complex biosocial phenomena like consanguinity.