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Biodemography in Siena, Italy

A Vienna1, G F De Stefano, A Bastianini

  • 1Dipartimento di Biologia, Università degli Studi di Roma Tor Vergata, Italy.

Journal of Biosocial Science
|November 18, 1998
PubMed
Summary

This study analyzed surnames and birthplaces in Siena, Italy, to assess population genetics. Findings indicate genetic structure is stable despite localized marriage patterns, with most marriages occurring within Tuscany.

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Area of Science:

  • Population Genetics
  • Human Evolutionary Biology
  • Social Anthropology

Background:

  • Understanding the genetic structure of populations is crucial for evolutionary and anthropological studies.
  • Siena, Italy, provides a unique setting to examine microevolutionary trends due to its historical context and defined geographical boundaries.

Purpose of the Study:

  • To investigate the genetic structure of the Siena population using surname and birthplace data.
  • To quantify levels of inbreeding and endogamy within the study population.
  • To analyze patterns of marital migration and their impact on genetic diversity.

Main Methods:

  • Data collection on parental surnames and birthplaces for children in Siena.
  • Calculation of isonymy and inbreeding coefficients (total, random, non-random).
  • Analysis of city and Contrada endogamy rates for parents and grandparents.

Main Results:

  • Isonymy and inbreeding coefficients are comparable to other Italian towns but lower than in villages or ethnic minorities.
  • Contrada endogamy decreased from grandparents' to parents' generation, while city endogamy remained significant.
  • Over 70% of marriages involved short-range migration, primarily within Tuscany, with no significant sex-based differences in migration.

Conclusions:

  • The genetic structure of Siena's population appears stable, with limited impact from recent changes in Contrada endogamy.
  • Short-range marriage migration within Tuscany is the dominant factor shaping the current genetic landscape.
  • The study highlights the interplay between social structures (Contrada) and genetic patterns in a defined Italian population.

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