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An Exception to the Apparent Relationship Between Stress and Fluctuating Dental Asymmetry

Several authors have observed an apparent relationship between the level of environmental stress and the magnitude of fluctuating dental asymmetry. In general, asymmetry has been less in modern human populations compared to earlier hominid populations (Suarez, Am J Phys Anthrop 41:41 1416, 1974; Doyle and Johnston, Am J Phys Anthrop 46:127-134, 1977; Perzigian, Am J Phys Anthrop 47:81-88, 1977). Data presented by Suarez indicate that fluctuating dental asymmetry is less in a modern white population than in a Neanderthal sample. Suarez suggests inbreeding among Neanderthals as a possible explanation. Doyle and Johnston present additional information showing asymmetry in Eskimo and Pueblo Indian samples to be greater than in modern whites. They attribute this to greater stress upon the Eskimos and the Pueblo Indians, who were less able to control their environment than the more technologically advanced modern white population. Perzigian presents data showing greater asymmetry in a hunting and gathering Archaic American Indian population (Indian, Knoll, ca. 4000-2500 B.C.) than in a pooled sample of two agricultural American Indian populations (Campbell and Larson, ca. 1400-1800 A.D.). Asymmetry in the agricultural Amerind population was not significantly different from that in a modern cadaver collection (the Hamann-Todd collection). Perzigian hypothesizes that the reduction in asymmetry is due to the alleviation of metabolic stress resulting from fewer and less plentiful food resources of the non-agricultural Indian Knoll population. Research on the dentition of a population of 208 white children from the University School Growth Study of the University of Michigan has provided data which appear to be at variance with