Study: Ancient Icelanders mix of Celtic and Norse ancestry

[Aren]

Iceland was settled by Norwegians, not by South Swedes.

But South Swedes are nearly identical to Norweigans. At most the non-Scandinavian input in Norwegians would be minimal.

[Grace O'Malley]

Do you have Mestizo or Amerindian matches in GEDmatch One-to-many tool?

I've never looked into it. I doubt I would though.

[Peterski]

But South Swedes are nearly identical to Norweigans.

Today. What aboout 1000-1500 years ago? Maybe at that time Norwegians were different.

I've never looked into it. I doubt I would though.

That's one of ways to check whether it is real or not.

If you score Ashkenazi admixture you can also check if you have Jewish matches.

Of course Jewish matches can also be due to Non-Jewish admixture in these Jews.

[Aren]

Today. What aboout 1000-1500 years ago? Maybe at that time Norwegians were different.

Really? What would the possibilty be of that? Be honest.

[Grace O'Malley]

Norse(Danish, Swedish, Norwegian) input was higher in England/Scotland than in Ireland, but highest in Orkney and lowest in Wales. Breton-like input much lower in England and Orkney than anywhere else in the isles. Makes sense to me, but we don't know how supervised the ADMIXTURE runes were in that study you are talking about. ADMIXTURE runs can sometimes be very accurate other times it doesn't make sense. Much like the mixed oracle on Gedmatch.

The Swedish was the only constant in all the areas. The Danish and Norwegian input was different as well as the German. Here is the table.

[Peterski]

I ve never seen a pca with Iceland between Norway and Ireland.

Check Davidski's Global 25 PCA. It also has it between Norway and Ireland.

They should start modelling modern populations as mixtures of ancient samples, not other modern populations.

[Petalpusher]

What Mesolithic ancestry? There is no any local Mesolithic Icelandic DNA.

Iceland was uninhabited until the Iron Age (at least) or the Middle Ages.

Of course, it still depends by which specific groups of Norwegians it was settled by originally and other influences. They seem to be shifted toward Ajvide (late mesolithic survivor), some more than others.

So Scandinavians became more Siberian-admixed in the last 1000 years?

It's possible due to internal migrations from the north, not new arrivals.

Eitherway this should not make that much difference but they are clearly not an Irish/Scandinavians mix

[Aren]

The Swedish was the only constant in all the areas. The Danish and Norwegian input was different. Here is the table.

Why is the Swedish constant? Did the British Isles receive that many Swedish vikings, almost equally everywhere or is it because ADMIXTURE runs are not really that accurate to measure actual heritage?

[Peterski]

but they are clearly not an Irish/Scandinavians mix

The study I posted in the OP says they are. BTW modelling modern British populations as mixtures of French and other continental populations doesn't make sense. Modern French are not the same as Early Iron Age "French". Already Busby 2015 revealed the role of recent Non-European admixtures in France:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4714572/

They should start using ancient samples, there are already hundreds of them.

[Aren]

The study I posted in the OP says they are. BTW modelling modern British populations as mixtures of French and other continental populations doesn't make sense. Modern French are not the same as Early Iron Age "French". Already Busby 2015 revealed the role of recent Non-European admixtures in France:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4714572/

You are contradicting yourself because both studies used ADMIXTURE. You can't nitpick like that.