Ancient Genetic Flow North America-South America

The Western Hemisphere. General term for the Americas following their discovery by Europeans, thus setting them in contradistinction to the Old World of Africa, Europe, and Asia.

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Ancient Genetic Flow North America-South America

Postby shawomet » Fri Nov 09, 2018 6:26 pm

https://www.inverse.com/article/50624-g ... th-america

"We report genome-wide ancient DNA from 49 individuals forming four parallel time transects in Belize, Brazil, the Central Andes, and the Southern Cone, each dating to at least ∼9,000 years ago. The common ancestral population radiated rapidly from just one of the two early branches that contributed to Native Americans today. We document two previously unappreciated streams of gene flow between North and South America. One affected the Central Andes by ∼4,200 years ago, while the other explains an affinity between the oldest North American genome associated with the Clovis culture and the oldest Central and South Americans from Chile, Brazil, and Belize. However, this was not the primary source for later South Americans, as the other ancient individuals derive from lineages without specific affinity to the Clovis-associated genome, suggesting a population replacement that began at least 9,000 years ago and was followed by substantial population continuity in multiple regions."

Highlights


Genome-wide analysis of 49 Central and South Americans up to ∼11,000 years old

Two previously unknown genetic exchanges between North and South America

Distinct link between a Clovis culture-associated genome and the oldest South Americans

Continent-wide replacement of Clovis-associated ancestry beginning at least 9,000 years ago

If you google the journal Cell, and name of paper is "Reconstructing the Deep Population History of Central and South America", first two authors are Posth and Nakatsuka, you should find the paper. The link will not paste in this forum.

https://www.cell.com/cell/fulltext/S0092-8674(18)31380-1?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867418313801%3Fshowall%3Dtrue
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Re: Ancient Genetic Flow North America-South America

Postby shawomet » Fri Nov 09, 2018 6:57 pm

The Extremely Fast Peopling of the Americas: a second genetic study, which both supports and differs from the findings described in the previous link:

https://www.theatlantic.com/science/arc ... as/575335/
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Re: Ancient Genetic Flow North America-South America

Postby kbs2244 » Tue Nov 13, 2018 1:57 pm

If I read it correctly, they are saying it was a fast moving, costal migration?
Then inland from the first settlements?
What about the mountains.
What drove them to attempt to cross that barrier?

Those mountains are high and very cold, and the Pacific coast is a pretty nice place to live.
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Re: Ancient Genetic Flow North America-South America

Postby circumspice » Tue Nov 13, 2018 5:00 pm

kbs2244 wrote:If I read it correctly, they are saying it was a fast moving, costal migration?
Then inland from the first settlements?
What about the mountains.
What drove them to attempt to cross that barrier?

Those mountains are high and very cold, and the Pacific coast is a pretty nice place to live.


Human curiosity. It's a huge part of the human psyche.

The need to know what is on the other side... There were probably a few hardy explorers who made the trek, then came back & told everyone of the wonders they saw 'over there'. Think about it... Once you clear the mountains & foothills, there are open plains as far as the eye can see. Large rivers too... They probably saw vast herds of horses, camels, elk, deer, bison, mammoths & mastodons...

Who could resist the urge to carve out & claim territory in such an environment? I would have been among the first to volunteer to go.
"Damn with faint praise, assent with civil leer, and, without sneering, teach the rest to sneer." ~ Alexander Pope
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Re: Ancient Genetic Flow North America-South America

Postby Simon21 » Wed Nov 14, 2018 9:17 am

kbs2244 wrote:If I read it correctly, they are saying it was a fast moving, costal migration?
Then inland from the first settlements?
What about the mountains.
What drove them to attempt to cross that barrier?

Those mountains are high and very cold, and the Pacific coast is a pretty nice place to live.


It is generally presumed that human beings followed coastal paths and went inland much later. As to what motivated them is anyone's guess, food, escaping from disease.

Why did the original Koories mount their frail craft, sail the seas to end up in a country that was largely desert?

Or the polynesians crossing vast distances in the Pacific to find small islands
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