Of course there were folk migrations after the Cardial settlers and they have changed in part the genomics of the people there, except Ogliastra..20-25 % of R1b and 10% circa of steppe admixture in most of the island is a good evidence of that. i've read also of an extra CHG component in Sardinians compared to EEF
i've never wrote that it's like the Po Valley, i've just said that it's less rocky than Corsica. And i repeat, Campidano in particular is a huge and fertile plain exploited by the Punics and the Romans..
End of the OT
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Sorry, you don't get to post again to have the last word. Ydna changes don't mean proportional AUTOSOMAL changes. You should know that by now.
From Chiang...
"Also, discrepancies between Y chromosome and autosomal SNPs can arise fromaccelerated genetic drift on the Y chromosome, sex-biased migrations, or natural selection."
One of the goals of the Chiang study was to investigate the discrepancy between y Dna and autosomal dna.
As I said repeatedly before this paper ever came out, it is easier to get to Sardinia from the mainland than from Africa, or at least it was for millennia, because of wind and sea currents:
"Also, discrepancies between Y chromosome and autosomal SNPs can arise fromaccelerated genetic drift on the Y chromosome, sex-biased migrations, or natural selection. from neighboring mainland populations, with stronger isolation between Sardinia and NorthAfrica than mainland Europe (Figure 4B)."
You brought up the Chiang et al study, but you don't seem to have read it all that carefully:
"The isolation of Sardinia is especially evident in patterns of rare allele sharing. Using adoubleton sharing statistic, we also find that sharing between Sardinia and other mainlandpopulations is small (normalized sharing ratio typically between 0.03 to 0.25), lower even thanthat between continental populations (e.g. approximately 0.3 to 0.7 between African and EastAsian samples) (Figure S4). Within Sardinia, Arzana again shows evidence of being moreisolated, with low sharing of alleles to the mainland (Figure S4)."
Arzana is from the even more isolated internal "Gennargentu" area from which most of the HGDP samples come.
Also, "This relationship is corroborated by identity by-descent(“IBD”) tract length sharing, where among mainland European populations, FrenchBasque showed the highest median length of shared segments (1.525 cM) with Arzana."
Not Romans, or Tuscans, or Piemontese despite the politics, and no, there was no Basque migration during recorded history. This is ANCIENT NEOLITHIC ERA similarity.
So, as I said, even the less isolated areas show no signal of extensive mixing with anyone else.
PART of Sardinia may have been fertile at one time. FOR MOST OF ITS HISTORY, MOST of Sardinia has been fit only for sheep.
NOW the discussion is closed. If you want to continue it, just pm me and I will move these posts over to the thread on the Chiang paper. In fact, I may do so anyway to clean up this thread.