I found this map representing the frequency in Europe of haplogroup R1a.
At first look it seems very clear we can associate this haplogroup with Slavs as we can see a marked border separating the high frequencies from low frequencies from example between Russia and Finland, Poland and Germany, Czechia and Germany and Austria, also Romania shows a marked decline in frequencies compared with Ukraine and Republic of Moldavia. Republic of Moldavia was heavily colonised with Slavs strating with 1812 so this is how can be explained the high frequencies of R1a in a region that belongs historically to Romanians. The same explanation can be atributed to the high frequencies of R1a in Baltic Countries : Balts and Slavs may be related, but alos Batlic countries were colonised by Slavs many times, Lithuania by Poles and Latvia and Estonia (Estons are Finno-Ugrics) by Russians (there are 30% Russians in Estonia and about 40% in Latvia).
Some enclaves also confirm the association of R1a with Slavs : Styria in Austria shows a high frequency, or it is known that historically Styria was populated by Slavs (proto-Solvenes) but afterwards was germanised in Early Middle Ages; the same we see a high frequency in Mecklenburg a region that was Slavic in Early Middle Ages then becoming Germanised. Also all Eastern Germany shows a higher frequency being distinguished from Western Germany, being known that in Early Middle Ages lands East of Elbe were Slavic.
In South Eastern Europe the situation seems more complicated. Croatia and Slovenia have very high frequencies of this haplogroup, in contrast with Italy, but also with Serbia and the rest of Balkans. It seems Serbia and Bulgaria had little influx of this haplogroup, but this can be explained as the pre-slavic populations here were in high numbers and contributed more importantly to the formation of Serbians and Bulgarians then Slavs.
This map would show also a very important contribution of Slavs to the formation of Hungarians.
So what do you think, can be haplogroup R1a related to Slavic migration?





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