The Gidra-speaking Papuans, numbering 1,850 and inhabiting thirteen villages, are an endogamous population; 95% of the married members were born within the Gidra territory. Indeed, 70% of the marriages are village endogamous. The bulk of the remainder of marriages are between adjacent villages. Thus, the Gidra population is maintained by inter-village migration in overlapping sub-units, each including several adjacent villages. The rate of out-migration to urban areas, which has been increasing in the last couple of decades, is higher in acculturated villages, although the difference is largely offset by an uneven flow of inter-village migrants within the territory.
Ohtsuka, Ryutaro; Kawabe, Toshio; Inaoka, Tsukasa; and Akimichi, Tomoya
"Inter- and Intra-Population Migration of the Gidra in Lowland Papua: A Population-Ecological Analysis,"
1, Article 17.
Available at: https://digitalcommons.wayne.edu/humbiol/vol57/iss1/17