"...Shuká Káa, on the other hand, appears more closely related to groups living in South and Central America today, such as the Karitiana, Suruí, and Ticuna of Brazil’s Amazon. But the signal is not statistically strong, and it may simply be a sign that the tribes all share DNA from the same ancient ancestors in Asia or Beringia where humans lived before they entered the Americas. But Shuká Káa’s maternally inherited mtDNA and nuclear DNA both suggest he is also close kin of the younger skeletons in the study. Connecting the dots between all the ancient individuals, Malhi’s team proposes that Shuká Káa is also ancestral to all those groups, including the Tsimshian and related tribes in the Pacific Northwest, they report today in the Proceedings of the National Academy of Sciences early edition.
In another interesting twist, the team found that the group of skeletons was not closely related to two other famous Paleoindians: the 8545-year-old Kennewick Man, unearthed from the banks of the Columbia River in Washington state, and the 12,600-year-old Anzick child from Montana. This suggests there were at least two groups of settlers who came to North America across the Bering Strait land bridge before 10,000 years ago, Malhi says. Although multiple migrations have long been documented, this is the first ancient DNA evidence of different groups arriving in North America at such an early date...."