[whimsicalism]

I had a recent discussion about this, will try to pull up the sources, but my understanding is displacement is the majoritarian current and cultural shift with same population very much a secondary that only applies in a minority of the cases

a lot of these admixture events show near total displacement of the y chromosome also

[PittleyDunkin]

I'm not disbelieving your source entirely, but it seems a little ridiculous to assume population displacement across all pre-history (or undocumented history if you'd prefer that term). Particularly when modern populations are so genetically diverse.

For one example, the idea a single "sea people" were responsible for the shift from bronze age to iron age in the eastern mediterranean is nearly universally rejected at this point. The populations of the mediterranean seem to descend at least in part from the bronze-age populations of the area. However the economic and cultural impact of the same period undeniably transfused rapidly through the region as heavily demonstrated with the archaeological record.

Even in the case of neanderthals we didn't fully displace so much as mostly displace but also admixed. Same with denisovans, cro magnons, etc. Genetic testing of cro-magnons shows modern-day descendants, and not just in the matrilineal or patrilineal line (i.e. presumably indicating either descendants of rape or partial infertility, as is presumed in the case of neanderthals).

With the spread of agriculture (seed cultivation, husbandry, plow, etc) we also see a mixture of genetic and cultural transfusion. Ditto with the horse, except much more rapidly, and horse-based technology much slower. This is partially why there's a gradient of genetic similarity across europe rather than a "european" set of genes—and with the horse technology, we have the benefit of an archeological and in certain cases textual evidence of trade between northern europe and the rest of the world.

Now, some of this is a matter of quibbling over semantics—is it displacement or is it admixture? Understandable. But the cultural diffusion in the material record is undeniable regardless of which term you pick. I'm not so sure it's worth picking a primary cause rather than accepting the inherent messiness of the archeological and genetic record where, as in the case of neanderthals, there isn't very solid evidence of infertility demonstrating firmly that the migration was mostly, if not entirely, displacement, as presumably non-hss-mixed neanderthals are extinct.

[nobody9999]

>when modern populations are so genetically diverse.

Are they? Are there any studies that confirm that hypothesis?

My understanding[0][1][2][3][4][5][6] (there are plenty more references, but I assume you get the point) is that modern human populations are incredibly similar, and not very diverse at all. In fact, all humans are more genetically similar to each other than many other species are, including chimpanzees and wheat.

[0] https://www.science.org/content/article/how-we-lost-our-dive...

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC7115999/

[2] https://www.ashg.org/wp-content/uploads/2019/09/genetic-vari...

[3] https://www.scientificamerican.com/article/humans-are-doomed...

[4] https://bigthink.com/life/humans-are-less-genetically-divers...

[5] https://www.jstor.org/stable/41466860

[6] https://www.kqed.org/quest/474/explosive-hypothesis-about-hu...

[PittleyDunkin]

> Are they? Are there any studies that confirm that hypothesis?

??? what is there to confirm? Why are you trying to spin an internal comparison as external? Indigenous populations tend to be more related to physically close indigenous populations than physically far apart indigenous populations. This is what I was referring to with the "genetic gradient". Comparing us to chimpanzees makes zero sense, let alone wheat, as we aren't trying to have sex with either, let alone "displace" them. I mean, hopefully not.

It's true that our diversity has lessened over time but this is "I don't see color" levels of delusion.

[nobody9999]

You said:

   when modern populations are so genetically diverse.

They are not. Humans as a species (in case you're not understanding what I mean by "species," I mean all the bipedal primates generally referred to as "Homo Sapiens") are not very genetically diverse.

And I provided documentation to support that assertion.

I didn't even get into the genetic evidence that variation within human population groups is greater than the variation between such groups.

That you made some sort of assumption as to the reason for my assertion, is on you and not me.

I merely pointed out that your assertion is not supported by the genetic evidence. Full stop.

[PittleyDunkin]

I don't understand why you're using diversity in this comparative manner when I was clearly not. I was just pointing out there's a lot of genetically distinct humans and this genetic distinction follows geographic trends. It's your choice to interpret it as a comparison to other species and frankly I'm bewildered why you decided to take the conversation there.

[nobody9999]

>I don't understand why you're using diversity in this comparative manner when I was clearly not.

Clear to whom? You? I'm sure it was. To anyone else? Not so much.

I read your words "I'm not disbelieving your source entirely, but it seems a little ridiculous to assume population displacement across all pre-history (or undocumented history if you'd prefer that term). Particularly when modern populations are so genetically diverse."

And you made the claim that "modern populations are so genetically diverse." Did someone commandeer your account or force you to write that at gunpoint?

If not, it was you who referenced genetic diversity.

Or does "modern populations are so genetically diverse" mean something other than "modern populations are so genetically diverse?"

As for my response, my apologies. Clearly I did not communicate my thoughts effectively. I will attempt to do so again.

>I was just pointing out there's a lot of genetically distinct humans and this genetic distinction follows geographic trends.

And your assertion is flat wrong. In fact, modern humans have very little genetic diversity, measured any way you'd like.

What's more, the human populations with the most genetic diversity are those native to Southern and Eastern Africa.

Populations everywhere else in the world are incredibly genetically similar to each other.

So much so that the differences within geographical population groups are greater than those between such groups.

As to my references to chimpanzees and wheat, that was just to point up that humans -- regardless of geographical population -- are not genetically diverse at all.

And that's it. Humans, regardless of geographic population, are remarkably similar in genetic make up. Humans are not, as you asserted, "so genetically diverse." Exactly the opposite.

Do you understand now? If not, I obviously need to learn to write more clearly.