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Peter Bellwood - First Farmers_ The Origins of Agricultural Societies (2004, Wiley-Blackwell) - libgen.lc.pdf
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The Americas

The Americas do not offer very rich data on specific questions of farming population and language family ancestry, and I must also confess to a lack of access to many of the relevant sources. But a few observations are of great interest. For instance, Sloan Williams and colleagues (2002) note that modem Yanomama village populations in Venezuela and Brazil, with high levels of within-village endogamy, can be clearly differentiated from each other in terms of nuclear genetic markers. The genetic distances between these village populations also correlate well with their recorded histories of fission. In addition, Nelson Fagundes and colleagues (2002) have found that mtDNA relationships follow linguistic relationships very clearly amongst Tupianspeakers in Brazil. This is very hopeful news for those interested in tracking the populations associated with language families back through time.

But when Williams et al. used mtDNA sequences as opposed to nuclear genetic data for differentiating Yanomama village populations, they were found not to work so well, apparently owing to sex-specific migration and sampling issues. In this regard, therefore, it is interesting that Ripan Malhi and colleagues (2003) suggest that mtDNA haplotypes in Mexico and the US Southwest relate more to geography than to language groupings. They state that early UtoAztecan languages were spread by male rather than female migrations, the former perhaps being identifiable through the wide distribution of a nuclear marker called Albumin*Mexico. The prospect of females staying close to home and males migrating makes a degree of sense, but one wonders how the claimed results reflect sampling and other factors.

In addition, the Americas were settled so recently in time that the major degree of biological differentiation that we see between populations of Old World origin has never had time to develop. Most population movements in the past, especially incremental rather than long-distance ones, would probably have mingled people already quite closely related in terms of genetic descent. If the Americas are to provide genetic data useful for questions of farming dispersal, much more research will be needed.