Slavs owe their ancestry partially to Scandinavians/Balts as well.
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They are not outliers but "edge-liers". They are just a natural peak of old Slavic ancestry for their region. For example in Lika there are 2 people with 34, and there are also samples with 33, 32 ,31. Somebody with 37 would be an outlier, because there would be a gap, people 35 and 36 are missing.
If the central range is 24-34 and the average is 29, then the North might end up 26-36, average 31, when more samples are collected. But maybe it won't be so clear-cut.
It seems a genetic cluster (a group of completely mixed people who freely intermarry) has a range of individual components of around 10. (or 8-12)
For now, North is Kordun-Banija, Bosanska Krajina, Northeast Bosnia and Vojvodina. With more samples with a more precise place of origin, it should just be the Northern part of Bosanska Krajina, and also the northern parts of central Serbia.
Ok, that makes sense.
Hmm, it's kind of following the Sava river, but basically now or then we're not speaking about an established geographic or administrative supra-region. Posavina is too far-fetched by definition, but it's kind of along the line. Now understand "the approximate geographic distribution" of the "North" average. Interesting, wonder if newer samples will be more northern shifted. Keep us updated.
Yes, but it can be read around that supposedly happened partial assimilation of the natives. It's something that would be especially expected in those early centuries upon arrival. If the average of eg Serbs from Bosanska Krajina is a bit more northern-shifted possibly did happen in a low amount, but seemingly, generally speaking, did not as they are all around the Serbian central/national average.
Western Bosnia, Lika, Kordun, Banija and Dalmatian hinterland were deserted because of Ottoman-Austrian wars, and then these empty areas were settled by Serbs.
I don't know what assimilation could happen.
I for example have higher Baltic score than Serbian average, but it means nothing unusual, since my pre-Slavic element is more central Balkan, or even southern Balkan, than it should be suppoused for far western Dinaric area.
Ethnic map of part of Lika.
Red are Serbs, blue are Croats.
As people can see, villages were very very homogenous. Serbs and Croats lived in separated communities, until industrialisation and urbanisation in Titos Yugoslavia, when lot of population moved to cities, and there started intermarriages.
https://i.imgur.com/yfWY6cp.png
And BTW, these Lika Croats were no natives either, but Bunjevci settlers from Herzgovina.