Ygorcs
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I'm not sure I'd call 15-20% WHG showing up eventually in LN farmers in Europe is nearly as important as percentages ranging from 55% down to 25-30% for steppe admixture. Plus, that 15-20% admixture would have come from HG women as well.
If I recall correctly, in Gambas et al there was one I1a who was hunter-gatherer autosomally, but he was lower status, perhaps a servant, and there was no admixture in any of the other inhabitants from that time period.
I mean, since this process took place after more than one millennium of fast spread of ANF admixture throughout Europe, it is quite unlikely IMHO that the peoples that were involved in this "WHG resurgence" were still typical WHG or even mostly WHG. They might have been like some of the more ANF-rich individuals in Blatterhöhle_MN, i.e. ~40% WHG + ~60% ANF. In that case, if you consider that some parts of Europe had ~0-10% WHG ancestry in the Early Neolithic and that increased to ~10-25% in the LN in many parts of Europe, the demographic change may have been pretty significant between the EN and the LN in some parts of Europe. Assuming the "WHG resurgence" involved a people that was ~40% WHG, and the pre-MN/LN populaton was ~10% WHG, changing to ~20% WHG in the LN, that would've meant a ~35% population replacement, which is as high or even higher than the steppe input in many parts of Europe.
For instance, I can see that Blatterhöhle_MN (~40% WHG), used as a proxy for a WHG-rich EEF population, would be needed to model many MN and LN European samples (population averages) not in small proportions, and interestingly it seems the change happened mostly along the Atlantic/North Sea Façade (where megalithism also seems to have spread from).
Results of the genetic ancestry model: https://imgur.com/a/QiD0PnC
Also, from what I can tell, we're seeing I2a showing up relatively early in western Europe where there's no indication of "pastoralism" before the arrival of steppe people to my knowledge; domesticated animals, yes, and maybe some transhumance as all farmers practice, but not pastoralism. Yes, there's I2a in the border areas of central Europe, among people who might have traded animals to the steppe and maybe even did some initial pastoralism, but I doubt it was a Europe wide phenomenon, or at least I've seen no papers indicating that it is.
Yes, that was just a speculation of mine, considering that the final phase of cultures like Cucuteni-Tripolye and Southeastern European/Balkanic Neolithic/Chalcolithic cultures seems to have been particularly more pastoral than the earlier stages of the same cultures or former cultures in the same place. There was also the GAC, whose way of life was pastoral, patriarchal and semi-nomadic enough for them to be mistaken for Indo-Europeans for a long time (and they also had been a clear example of the "WHG resurgence"). And that was even before steppe admixture became significant enough in any of them. That may have been caused by climate change, not necessarily a foreign influence and a change in the demographic makeup. But in any case the WHG resurgence seems to have happened contemporaneously with the spread of megalithism and perhaps, I think, a more maritime culture in parts of the continent.