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Donald Trump-like rock attracts visitors in southern Turkey
Ancient formation in Turkish town of Silifke is being likened to the silhouette of US President Donald Trump.
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South Americans may have traveled to Polynesia 800 years ago
DNA analyses suggest that Indigenous people from South America had a role in the early peopling of Polynesia.
www.sciencenews.org
Ioannidis, of Stanford University, and Moreno-Estrada’s group searched for molecular markers of shared ancestry in DNA of 807 individuals from 17 island populations in Polynesia and 15 Indigenous groups from relatively near Central and South America’s Pacific coast. Genetic data included 166 Rapa Nui inhabitants and 188 individuals from other Pacific islands. All DNA came from present-day people except for samples from four individuals, each from a different site in the Americas. Those ancient individuals lived between around 500 and 7,400 years ago.
Comparisons of the length of DNA segments shared by Polynesians and Indigenous peoples from the Americas enabled calculations of when Indigenous American DNA was first introduced to Polynesian groups. Smaller DNA segments are assumed to represent older instances of mating across populations than longer segments due to the breakdown of shared segments in later generations.
DNA resembling that of Indigenous people now living in Colombia appeared on an island called Fatu Hiva in the southern Marquesas Islands by around 1150, probably the result of a single ancient contact, the researchers estimate. The South American ancestry reached three nearby sets of eastern Polynesian islands between roughly 1200 and 1230, followed by Rapa Nui in around 1380. The genetic data can’t establish which Polynesian islanders mated with the South Americans before spreading that ancestry elsewhere in the Pacific, only that evidence so far points to the southern Marquesas.
But other contact scenarios between Polynesians and South Americans exist. The new study provides genetic support for a scenario in which ancestors of Rapa Nui settlers traveled to South America and possibly returned with sweet potatoes, says archaeologist Carl Lipo of Binghamton University in New York. Those ancestors then could have carried that crop and South American DNA to a majority of eastern Polynesian islands, he says. Some scientists have previously suggested that Polynesians traveled to and from South America, bringing the sweet potato to eastern Polynesia more than 800 years ago (SN: 4/12/18) and possibly chickens to the Americas more than 600 years ago (SN: 6/5/07).
Ancient Polynesians’ “tremendous navigation skills” would have made possible round trips to South America, Lindo agrees.
Radiocarbon dating of archaeological remains and linguistic studies suggest that people reached Rapa Nui by around 1200, nearly 200 years before the newly estimated arrival of Polynesians with South American ancestry, archaeologist Paul Wallin writes in a commentary published with the new study. Trade and cultural exchanges may have connected Rapa Nui to South America before DNA did, suggests Wallin, of Uppsala University in Sweden.
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