Moreno-Estrada, Sandoval, and their team found that people on many islands had both Polynesian and European ancestry, reflecting their colonial histories. But they were also able to detect a small amount of Native American ancestry in people from the eastern Polynesian islands of Palliser, the Marquesas, Mangareva, and Rapa Nui. The Native American sequences were short and nearly identical—seemingly a legacy of one long-ago meeting with a Native American group, rather than sustained contact over generations, Moreno-Estrada says.
Comparing those sequences with genomes from people from 15 Indigenous groups from the Pacific coast of Latin America, researchers found most similarity to the Zenu, an Indigenous group from Colombia, the team reports today in Nature.
Analyses of the length of the Native American sequences show this ancestry appeared first on Fatu Hiva in the South Marquesas roughly 28 generations ago, which would date it to about 1150 C.E. That’s about when the island was settled by Polynesians, raising the possibility the contact happened even earlier. The genetic legacy of that mixing was then carried by Polynesian voyagers as they settled other islands, including Rapa Nui.
Where exactly the first encounter took place, the team can’t say. Modern Latin American fishermen lost at sea have been known to drift all the way to Polynesian islands. “It could have been one raft lost in the Pacific,” Moreno-Estrada says.
But it’s more likely that Polynesians traveled to the northern coast of South America, says Keolu Fox, a genome scientist at UC San Diego. Polynesian voyagers frequently traveled between islands and could have journeyed to South America and back, perhaps multiple times, Fox says. “In the process, these Polynesians bring back the sweet potato, and they also bring back a small fragment of Native American DNA” from relationships on the mainland. “The ocean is not a barrier” for Polynesians, he says.
https://www.sciencemag.org/news/202...s-met-native-americans-long-europeans-arrived
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