From Newsgroup: sci.anthropology.paleo


https://academic.oup.com/mbe/advance-article-pdf/doi/10.1093/molbev/msaf041/61812258/msaf041.pdf

Insufficient evidence for a severe bottleneck
in humans during the Early to Middle
Pleistocene transition

Abstract
A recently proposed model suggests a severe
bottleneck in the panmictic ancestral
population of modern humans during the Early
to Middle Pleistocene transition. Here, we
show this model provides a worse fit to the
data than a panmictic model without the
bottleneck.

"Finally, there is growing evidence that
humans do not descend from a single, panmictic
13 ancestral population. Instead, recent
studies suggest that humans descend from two
(or more) 14 divergent populations that admixed
together prior to the OOA event."

"In summary, we find there is insufficient
evidence to support a model of human evolution
where a panmictic population undergoes a
severe bottleneck approximately 1Mya. We
stress that newly proposed models should be
shown to fit the data just as well or better
than traditional models."


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From Newsgroup: sci.anthropology.paleo

On 2/16/25 11:26 PM, Primum Sapienti wrote:

Insufficient evidence for a severe bottleneck
in humans during the Early to Middle
Pleistocene transition

Bottlenecks were common enough, on a geologic time scale,
and molecular dating sucks rancid eggs through a straw.

Encapsulated within this period which they can find no
evidence of a bottleneck was the earth getting struck in
the small of the back by one or more not-at-all-tiny
objects from space.

The impact would have been... oh... .right where the
Out of Asia people place the origins of humanity.

And it would have been... what's the word? "Catastrophic."

First there would have been a "Nuclear Winter," or the
bolide version thereof. And, like Toba, it would have
favored Africa BECAUSE the closer you are to the equator
and the sea, the better your odds of survival. Well,
follow the equator and, oops, Asia is out because THAT'S
where the damn thing struck! So that leaves Africa.

Such events hurt the northern hemisphere the most.

Well. I guess they hurt the immediate impact zone the
worst but, apart from the guys who get vaporized in the
first split second, the people who get it the worse are
in the northern hemisphere. This is where the skies are
going to take the longest to clear and the effect on
temperature is going to be at it's most extreme...

It's genuinely impossible for there to have NOT been a
bottleneck event. Seriously. It's just plain ignorant to
claim you can have major impacts -- CLIMATE CHANGING
IMPACTS -- and not make it tough to do things like not
die.

NOTE: A similar event is accepted by everyone outside
of NOAA for the Younger Dryas Cooling, and it lasted for
over a thousand years... plus stamped out Clovis Culture
in the Americas, ended other cultures in the world...
--
https://jtem.tumblr.com/tagged/The%20Book%20of%20JTEM/page/5
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