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Shifting patterns of sex dimorphism in three Japanese populations.

Levels of sex dimorphism among three related Japanese populations were calculated for 19 anthropometric variates. Two of the groups were born and raised contemporaneously in Japan; one remained there permanently (the sedentes) and the other migrated to Hawaii. The third group comprised the Hawaii-born offspring of the migrants. The results show a clear reduction in levels of sex dimorphism in the migrants as compared to both the sedentes and the Hawaii-born. Upon finding that the migrant females were generally larger than those of the other two groups, and after reviewing certain sociocultural phenomena related to the migration, it is hypothesized that the reduction in sex dimorphism was a transient change brought about by preferential choice of mates by the male migrants.