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It's the case for anybody in any country, just the replacement here was likely total in the last 6000 years. Im not that surprised though they were WHG's roaming in Sicily like everywhere else even if it might be hard to imagine in our modern conceptions, Europe was extremely homogeneous in that era.Originally Posted by Sikeliot
They still have some HG related ancestry but less than even Sardinia, so the likely scenario was total replacement of the WHG's by neolithic (who carried some early branch of HG), then another layer on top of something in the Copper Age - Bronze Age but genetically very different from the Beakers or steppe like people and whith no re emergence of local HG like in most parts of Europe. The last stage probably explains most of the difference we see today in the continent.
As for Greece, it was the first thing that caught my eyes on the pca and admix run, now im actually reading the paper, it's explained further there :
Early Greek Neolithic was different: "four southern Greek (Peloponnese) Neolithic individuals – three from Diros Cave and onefrom Franchthi Cave, plus one previously published individual from Diros – are not consistent with descending from the same source population as other European farmers...have less WHG related ancestry than Anatolia Neolithic ones...suggesting an independent migration into Europe from a population that split off from the ancestors of the northwest Anatolian individuals from which we have data... their Near Eastern ancestry is derived from a lineage that is close, or basal, to the non-WHG component of Anatolian Neolithic ancestry. One possibility is that this independent migration is related to an earlier Aceramic Neolithic in Greece that was derived from the pre-pottery Neolithic(PPN of Cyprus and the Levant. Under this model, the earliest Neolithic populations in Greece migrated from the Levant, perhaps via the southwestern Anatolian coast as early as7000 BCE, but the majority of Neolithic ancestry arrived around 500 years later via a route that passed through northwestern Anatolia... Populations related to the Peloponnese Neolithic potentially made a small contribution to the ancestry of other Mediterranean Neolithic populations like Early NeolithicIberia and Neolithic farmers from northern Greece but we do not strongly reject models395 without such a contribution (Supplementary Information, section 3).
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