The EBA and Bell Beaker samples of Northern Italy seem to meet roughly where IA Latins/Etruscans cluster in the modern Spaniard area of the PCA. This represents the earliest waves of steppe influence and perhaps is the actual ethnogenesis of the people who spread the proto apennine material culture that later went on to become the latins, samnites, umbrians, oenotrians and etruscans. They are more WHG drifted than populations like the IA Picenes, BA/IA illyrians and modern Northern Italians.
The modern spaniard-like and EEF-like samples from EBA Marche are of particular importance because they prove a significant displacement or admixture event in local ancestry. We have IA samples from the Picenes to compare and they instead cluster in the modern northern Italian zone of the PCA. This displacement necessarily had to occur between the middle and final bronze age, which of course encompasses the terramare migrations to po valley and the alps. I'd be highly surprised if we don't see the same displacement phenomenon in northern Italy as well, given the genetic profiles we've seen from the BA proto-illyrians and vatya/nagyrev cultures. This is all very good data with significant sample size, but the limitation is the age of these samples. Most of the answers to the big questions on Italian ethnography are going to be found in later finds than what was recovered for this study.
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