Much has been said and reported about studies and discoveries focusing on searching for the first Americans. Less popularized but equally important has been the ongoing research related to illucidating the picture of how and when the Arctic, the last region of the Americas known to have been populated, was settled.
Archaeological and cultural evidence points to migrations of several different groups, the Paleo-Eskimos, Neo-Eskimos, and Inuits, into the region, going back as far as 6,000 years ago for the earliest arrivals of the Paleo-Eskimos from across the Bering Strait from Siberia.
Now, Maanasa Raghaven of the University of Copenhagen and colleagues have tested this scenario by conducting genomic sequencing on extractions of 169 ancient human bone, teeth and hair samples from Arctic Siberia, Alaska, Canada, and Greenland. They compared them to the same from two present-day Greenlandic Inuit, two Nivkhs, one Aleutian Islander, and two Athabascans.
What they found provides a new picture of the population history of the North American Arctic. Their analyses supports the model of the arrival of Paleo-Eskimos into North America as a separate migration from those which gave rise to Native Americans and Inuit. But the results also suggested they shared a common Siberian ancestor.
“We show that Paleo-Eskimos (~3000 BCE to 1300 CE) represent a migration pulse into the Americas independent of both Native American and Inuit expansions,” write Raghaven, et al. “Furthermore, the genetic continuity characterizing the Paleo-Eskimo period was interrupted by the arrival of a new population, representing the ancestors of present-day Inuit, with evidence of past gene flow between these lineages. Despite periodic abandonment of major Arctic regions, a single Paleo-Eskimo metapopulation likely survived in near-isolation for more than 4000 years, only to vanish around 700 years ago.”*
Moreover, the researchers show evidence for gene flow between the Paleo-Eskimos and the Neo-Eskimo Thule culture, though it is likely to have occurred in Siberia, among the two groups’ common ancestral population, and not in the Arctic, where these two groups were largely separated.
The study suggests a complex interplay between genes and culture, helping to provide a clearer picture of how the Arctic was settled.
The study is published as a research article in the journal Science.
*“The genetic prehistory of the New World Arctic,” by M. Raghavan at University of Copenhagen in Copenhagen, Denmark, and colleagues.
Source: Part of this article was adapted and edited from an AAAS press release, Genetic Data Sheds Light on Early Peopling of North American Arctic.
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