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  • Title: Clan-structured migration and phenotypic differentiation in the Jirels of Nepal.
    Author: Williams-Blangero S.
    Journal: Hum Biol; 1989 Apr; 61(2):143-57. PubMed ID: 2767667.
    Abstract:
    This paper examines the impact of clan-structured migration on the between-village differentiation of the Jirels, a tribal population of eastern Nepal. The Jirel population is geographically restricted to nine villages, all of which were sampled to some extent for this study. Data on five head measurements, stature, and digital ridge counts are utilized to illustrate the patterns of phenotypic variation. Multivariate statistical techniques are used to assess the extent to which clan membership and associated patterns of marital exchange influence the population structure of the Jirels. The phenotypic characteristics of randomly generated migrant sets are compared to those of the observed clan-structured sets, demonstrating the clan-related phenotypic nonrandomness of migrants. The results indicate that clan-structured migration may significantly influence the amount of between-village variation. Clan structure may be a significant factor in determining patterns of variation and should not be ignored in studies of microdifferentiation in tribal populations.
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