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Microevolution in prehistoric Andean populations: I. Chronologic craniometric variation

F Rothhammer, J A Cocilovo, S Quevedo

    American Journal of Physical Anthropology
    |August 1, 1982
    PubMed
    Summary

    Microevolutionary changes in a Chilean coastal population over 6500 years were analyzed using craniometric data. Chronologic distance explained most variation, with kinship decreasing steadily over time.

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    Area of Science:

    • Paleoanthropology
    • Bioarchaeology
    • Human Evolution

    Background:

    • Understanding microevolutionary processes is key to human history.
    • Craniometric analysis provides insights into population dynamics and relationships.

    Purpose of the Study:

    • To investigate microevolutionary patterns in a Northern Chilean coastal population.
    • To quantify the relationship between chronologic distance and craniometric variation.
    • To assess changes in kinship over a 6500-year period.

    Main Methods:

    • Mahalanobis D2 statistics were calculated for nine craniometric variables.
    • Analysis included five prehistoric population groups.
    • Chronologic distance and kinship rates were computed.

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    Main Results:

    • Approximately 80% of craniometric variation was explained by chronologic distance.
    • Kinship decreased at a constant rate of 8.6 x 10^-5 per year.
    • Significant microevolutionary changes were observed over 6500 years.

    Conclusions:

    • Chronologic distance is a major driver of craniometric variation in this population.
    • The observed rate of kinship decrease suggests consistent population dynamics.
    • This study provides a quantitative model for microevolutionary change in prehistoric coastal populations.