Anthropometric variation among Bering Sea natives

Area of Science:

• Anthropology
• Human Evolution
• Population Genetics

Background:

• Anthropometrics, the study of human body measurements, can reveal microevolutionary forces.
• Reconstructing population history is crucial for understanding human genetic diversity.
• Bering Sea populations, Aleuts and Eskimos, offer a unique case for studying population dynamics.

Purpose of the Study:

• To investigate the phylogenetic relationship between Aleut and Eskimo populations using anthropometric data.
• To assess the utility of morphological traits in inferring population history and structure.
• To compare anthropometric findings with existing genetic and historical studies.

Main Methods:

• Utilized anthropometric measurements from St. Lawrence Island Eskimos and Pribilof Island Aleuts.
• Applied the Relethford-Blangero method for phylogenetic analysis.
• Employed principal components analysis and neighbor-joining trees with Euclidean distances for comparative analysis.

Main Results:

• Anthropometric data confirmed a strong phylogenetic relationship between Aleut and Eskimo populations.
• The Relethford-Blangero method showed distinct clustering of Aleuts and Eskimos, explaining 97.3% of data variation.
• European admixture influenced the relationship between Gambell and St. Paul populations, while St. George showed divergence.

Conclusions:

• Anthropometrics are effective tools for inferring population history and structure.
• Historical factors, including genetic drift and gene flow, have shaped the relationships among Bering Sea populations.
• Specific populations like St. George exhibit unique divergence patterns due to these historical forces.