Craniometric variation in the Aleutians: integrating morphological, molecular, spatial, and temporal data

Area of Science:

• Physical anthropology
• Human evolution
• Bioarchaeology

Background:

• Previous studies on Aleut origins and cranial morphology yielded differing conclusions.
• Limited analytical methods and typological approaches restricted earlier research.
• Recent genetic studies offer insights but morphological analyses require advanced methods.

Observation:

• Multivariate statistical analysis of craniometric data was employed.
• Significant temporal changes in Aleut cranial morphology were identified.
• Morphological changes were concentrated in cranial length, breadth, and height.

Findings:

• Observed morphological changes align with Hrdlička's historical observations.
• Changes in cranial morphology were not correlated with shifts in mitochondrial DNA haplogroup frequencies.
• Increasing craniometric variability over time suggests localized selection or environmental factors, not significant gene flow.

Implications:

• The findings support in situ evolutionary changes in Aleut populations.
• Migration may not be the primary driver of observed morphological shifts.
• Sociocultural changes, alongside biological factors, likely contributed to Aleut evolutionary trajectory.