69: Ancestral Native American Dispersal and Admixture 3. Meltzer describes the dispersal of the first peoples into the Americas, explaining that ancestral Native Americans likely arrived first and made it south of the ice sheets, splitting into Northern and S
The John Batchelor Show
John Batchelor
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🗓️ 10 November 2025
⏱️ 12 minutes
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Summary
3. Meltzer describes the dispersal of the first peoples into the Americas, explaining that ancestral Native Americans likely arrived first and made it south of the ice sheets, splitting into Northern and Southern groups with the Southern group dispersing rapidly toward Tierra del Fuego. This rapid dispersal into completely unknown, people-free land suggests dogs—whose genomic history matches human travel—were likely part of their cultural repertoire for defense and hunting. Genomic data reveals that ancient groups later became isolated, developing distinctive genetic markers before experiencing later admixture as mobility increased, and critically shows no ancestral relationship between these first Americans and European, Ainu, or Polynesian populations.
Transcript
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| 0:00.0 | This is CBSI in the world. I'm John Batchew with Professor David Meltzer, who is generously speaking of his article with his colleague Eski-Wilderslav in Nature magazine, new information about the peopling of the Americas as inferred from ancient genomics. |
| 0:20.6 | There are many questions to be answered, and that's the joy of this article, asking all the... about the peopling of the Americas as inferred from ancient genomics. |
| 0:25.5 | There are many questions to be answered, and that's the joy of this article, asking all these questions. |
| 0:35.6 | We now have the ancestral Native Americans in North America sometime around 15,000 years ago, 15 to 13,000 years ago, when the ice sheet is still in place, but there may or may not be a corridor. |
| 0:40.3 | There is, of course, the Pacific coast to come down. There is a division between the northern North |
| 0:47.3 | Americans and the southern North Americans, which I read, David, is equidistant from the ancient |
| 0:52.4 | beringia. And here comes some contradictory questions. |
| 0:56.2 | Were the ancient Native Americans here before the ancient beringia? |
| 1:00.4 | Those are two different groups. |
| 1:01.7 | What do we know, David? |
| 1:03.4 | Well, this is a really interesting matter that we're still sort of trying to get our heads around. |
| 1:10.1 | So let's briefly return to Northeast Asia. |
| 1:14.7 | We have our Basel Native American groups emerging. |
| 1:18.9 | At some point after that, we have a group that sort of spins off, |
| 1:23.5 | and they will ultimately become what we've referred to as ancient Beringians. |
| 1:27.9 | The ancient Beringians and the ancestral Native Americans, they're both Native Americans. |
| 1:33.5 | They both make it across the land bridge. |
| 1:35.2 | They both make it into Alaska. |
| 1:37.4 | But they don't necessarily come at the same time. |
| 1:40.5 | And by the time they arrive at different times, they're pretty distinctive from one another. |
| 1:48.4 | Again, they're still Native American, but our suspicion in what we report in this review essay in nature is that we think that the ancestral Native Americans got here first. |
| 2:00.0 | They were the first population to sort of peel off and head east into Alaska and then |
... |
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