Vitruvius
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Central Italians today are roughly a 50/50 split between a Northern Italic and a LBA/Magna Graecian Greek profile. The Northern Italic came from late antiquity onward and is not the same source of ancestry as IA Latin ancestry (although the two are closely related). Their "Northern" pull after the imperial age comes directly from Northern Italy itself and we see this in a minority of outlying late antiquity Northern Italian profiles around Rome (which seem to exist before the langobard migrations I might add).It was not a "Middle Eastern replacement". Just substantial additional admixture with a Italic majority.
If you use those Aegean-samples plotting with Crete you get a >60% replacement in Lazio.
How much Italic do you believe Lazio Italians and Abruzzes to be?
The Ischia samples pretty plot in Aegean cluster as written below:
One is more pushed towards the Sicilians (which reflects a part of genetic variation that also existed among LBA Greeks the ones with more steppe overlapping with the borders of Sicilian cluster and the ones with less steppe being closer to Minoans. )
Ancient Greeks were similar to Southern Italians but pushed in Western direction towards the Minoans due to higher ANF ancestry.
If you hypothetically create a 2/3 Greek and 1/3 Italic model you'd still more West Asian admixture to fully achieve the Imperial cluster.
The Ischia samples are overlapping the Sicilian cluster based on where they sit and neither of them look Minoan like. Minoans cluster far closer to EEF populations as they they had less caucasian and steppe ancestry. The modern population four dots underneath the Ischians are maltese as a reference. You can see which common West Eurasian PCA they were using to map it with if you look closely. I'll even draw in where I'm seeing the samples to be crystal clear.
Jovalis is right with his comment, however. Your perception that Ancient Greeks did not overlap Southern Italians is an outdated assumption and has been disproven. This idea was perhaps correct for EBA/MBA greeks, but not LBA Greeks which is the population we are are assuming Magna Graecians will closely reflect and the leaked Ischians do confirm this. The west asian ancestry you refrence is already found in these Greek populations anyways. Many Anatolians also considered themselves Greeks by the Iron age and would've been a part of the Magna Graecian phenomenon to at least some extent. Nobody is denying West asian genetic input, but we are instead rejecting panmixia with the middle east on the whole.
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