Effect of Recent Historical Events on Migration and Isonymic Stratification among the Rama Amerindians from Nicaragua

Norberto F. Baldi, Phillip E. Melton, Michael H. Crawford
2014 Human Biology: The Official Publication of the American Association of Anthropological Genetics  
The Rama Amerindians from southern Nicaragua are one of few indigenous populations inhabiting the east coast and lowlands of southern Central America. Early 18 th century ethnohistorical accounts depicted the Rama as a mobile hunter-gatherer and horticulturalists group dispersed in household units along southern Nicaraguan rivers. However, during the 19 th and 20 th centuries, Rama settlement patterns changed to aggregated communities due to increased competition for local resources resulting
more » ... om non-indigenous immigration. This study's objective was to discern the degree of relatedness between and within subdivisions of seven of these communities based on patterns of surname variation and genealogical data. We applied surname analyses (n= 592) to evaluate inter-and intrapopulation variation, consanguinity and substructure estimates and isolation by distance, and used a genealogically based marital migration matrix obtained during fieldwork in 2007 and 2009 to better understand internal migration. Our evaluation indicates a pattern of geographic distribution linking kinships in major subpopulations to nearby family-based villages. Mantel tests provide a correlation (r = 0.4; P < 0.05) between distance matrices derived from surname and geography among Rama communities. Genealogical analysis reveals a pattern of kin networks within both peripheral and central populations that is consistent with previous genetic investigations where the Amerindian mitochondrial DNA haplogroup B2 is commonly found among peripheral communities and A2 is frequent in central subpopulations. Marital migration and genealogies provide additional information regarding the influx of non-Ramas to communities near populated villages. These results indicate that the disruption of the Rama's traditional way of life has had significant consequences on their population structure consistent with population fissions and aggregations since the 18 th century.
doi:10.3378/027.086.0105 pmid:25401985 fatcat:dq5qiyhmtrfx3fawzwfvysctgu