At https://phys.org/news/2026-04-pampas-patagonia-dna-reveals-south.html … it seems nowadays that genetic information is becoming more and more centred on regionality. Instead of a study of random DNA from a sample of skeletons from all of South America, here we have a restricted area comprising northern Patagonia, the Pampas as far as the lowlands of Uruguay. We also have 52 different bodies who lived over the last 6000 years. No doubt this will be expanded as time goes on but for now the geneticists have been able to define three separate population groups that arrived in the region at different times and mixed with the previous inhabitants – or remained aloof, come to that, and went on in their own sweet way.
It seems mid to late Holocene migration episodes are not confined to Europe and Asia but were also endemic in the Americas. It seems that people were not moving into southern Patagonia, or that is the suggestion, and there must be a reason for that. Did it become colder and wetter, for example, deterring new adventurer groups. A study of southern Patagonia DNA may be overdue as the people there were regarded as primitive by the Europeans that arrived there a few hundred years ago.
These population changes appear to coincide with archaeological evidence of cultural change. Such archaeology is only indicatory and not absolute when it comes to newcomers. As the DNA now supports the changing cultural landscape the archaeologists will be eager to seek out links to their former zones of occupation.