The 81st Annual Meeting of the American Association of Physical Anthropologists (2012)


Secular change in the human innominate: from the 19th to the 20th century

ALEXANDRA R. KLALES.

Department of Anthropology, University of Manitoba

Saturday Afternoon, Forum Suite Add to calendar

The purpose of this research was to examine the magnitude and direction of secular changes in the human innominate. To assess these temporal differences, a sample of 211 left, adult innominates of documented sex and ancestry was used from the Hamann-Todd Collection, composed of individuals born during the 19th century, and also from the W. M. Bass Donated Collection, composed of individuals born during the 20th century. Data were collected from males and females of two populations: American Blacks and American Whites.

Twenty-two 3D landmark coordinates of the innominate were collected for each individual using a digitizer. From these coordinates, geometric morphometric analysis was performed to assess shape changes. The raw coordinate data was first subjected to a Procrustes fit to scale, rotate and translate the data to Procrustes coordinates. Using the Procrustes coordinates, the combined, cross-validated percent correct classification between the two temporal periods using linear discriminant function analysis was 99.1%. Because of high classification accuracy, specific differences in pelvis dimensions were explored further. Although there are limitations of sample size for one subset, further analyses controlling for sex and ancestry further separated groups by temporal period, suggesting that secular change in the human innominate occurred.

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