They found that while most Native American populations descend primarily from one migration, there were two later ones that also made a significant genetic contribution. The later migrants probably arrived in boats, after the land-bridge disappeared at the end of the ice ages.
In a press statement, Ruiz-Linares explains that for years there has been a debate about whether the settlement of the Americas came from one or several migrations out of Siberia. The findings confirm what linguist Joseph Greenberg proposed in From studying language differences among Native Americans, he said the Americas must have been populated in three waves of migration.
The analysis also showed that once these waves of migrations arrived in the Americas, the groups expanded southwards, hugging the coastline, splitting off along the way. After they split off, the groups mixed very little with each other, especially the ones that ended up in South America. But while non-mixing appeared to be the general pattern after dispersal, the researchers found two striking exceptions.
One shows a North-South re-mix, and the other a West-East re-mix. In the North-South re-mix, it looks like there was some back-migration from South America northwards, and this is reflected in the genomes of Central American Chibchan-speakers, which contains DNA from two widely separated strands of Native ancestry. Share Tweet Email. Why it's so hard to treat pain in infants.
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