New paper on Serbian yDNA. Too bad they don't apply higher resolution SNP testing. The paper is kind of last decade, with the most interesting part being the historical migratory summary:
https://www.sciencedirect.com/science/article/abs/pii/S1872497322001089
I'm pretty sure that we will find, on the longer run, different waves of E-V13 entering the Balkans, from very early (Urnfield) to the latest (Slavs), with the bulk coming from Thracians and Dacians. I have little doubt that some more Northern-Carpathian leaning subclades of E-V13 spread to the Balkans with the Carpi and Costobocci, the main free Dacian tribes, fairly late. Not necessarily the bulk of it, but I wouldn't wonder if that turns out to be a contributing factor.
Distribution of Y-chromosome haplogroups in Serbian population groups originating from historically and geographically significant distinct parts of the Balkan Peninsula
Abstract
Our study enrolled 1200 Serbian males originating from three geographical regions in the Balkan Peninsula inhabited by Serbs: present-day Serbia, regions of Old Herzegovina and Kosovo and Metohija. These samples were genotyped using the combination of 23 Y-chromosomal short tandem repeats (Y-STRs) loci and 17 Ychromosomal single nucleotide polymorphisms (Y-SNPs) loci for the haplotype and haplogroup analysis in order to characterize in detail Y chromosome flow in the recent history. Serbia?s borders have changed through history, forcing Serbs constantly to migrate to different regions of Balkan Peninsula. The most significant migration waves in the recent history towards present-day Serbia occurred from the regions of Old- Herzegovina and Kosovo and Metohija that lie in the south-west/south. High haplotype diversity and discrimination capacity were observed in all three datasets, with the highest number of unique haplotypes (381) and discrimination capacity (0.97) detected in the samples originating from the present-day Serbia. Haplogroup composition didn?t differ significantly among datasets, with three dominant haplogroups (I-M170, E-P170 and R-M198), and haplogroup I-M170 being the most frequent in all three datasets. Haplogroup E-P170 was the second most dominant in the dataset originating from geographical region of Kosovo and Metohija, whereas haplogroup R-M198 was the second most prevalent in the dataset from historical region of Old Herzegovina. Based on the phylogenetic three for haplogroup I constructed within this study, haplogroup I2a1-P37.2 was the most dominant within all three datasets, especially in the dataset from historical region of Old Herzegovina, where 182 out of 400 samples were derived for SNP P37.2. Genetic distances between three groups of samples, evaluated by the Fst and Rst statistical values, and further visualized through multidimensional scaling plot, showed great genetic similarity between datasets from Old Herzegovina and present-day Serbia. Genetic difference in the haplogroup distribution and frequency between datasets from historical region of Old Herzegovina and from geographical region of Kosovo and Metohija was confirmed with highest Fst and Rst vaules. In this study we have distinguished genetic structure, diversity and haplogroup frequencies within 1200 Serbian males from three datasets, relationships among them as well as with other Balkan and European populations, which is useful for studying recent demographic history.
https://www.sciencedirect.com/science/article/abs/pii/S1872497322001089
High haplotype diversity and discrimination capacity were observed in all three datasets, with the highest number of unique haplotypes (381) and discrimination capacity (0.97) detected in the samples originating from the present-day Serbia. Haplogroup composition didn?t differ significantly among datasets, with three dominant haplogroups (I-M170, E-P170 and R-M198), and haplogroup I-M170 being the most frequent in all three datasets. Haplogroup E-P170 was the second most dominant in the dataset originating from geographical region of Kosovo and Metohija, whereas haplogroup R-M198 was the second most prevalent in the dataset from historical region of Old Herzegovina
Given its geographical position, population history of the Balkan Peninsula is determined by numerous migrations that have taken place throughout history. Based on archaeological analyses, repopulation of the Balkan Peninsula occurred during the Mesolithic and Neolithic periods [4], [5], [6]. During the Bronze age, people belonging to the Urnfield culture from central Europe [7] colonized the entire region from the Baltic to the Adriatic Sea [8]. From 1000 BCE the Balkan Peninsula was occupied by the Illyrians in the west and by the Thracians in the southeast [9]. In 270 CE Roman emperors moved Romanized Dacians south of the Danube and founded first one and latter two Dacian provinces whose capitals were Ratiaria (Vidin) and Serdica (Sofia). Up to 318 CE they continued moving free Dacian tribes by force who were threatening the empire?s borders. One such tribe was Carpi that resided in the region of modern Moldavia. Some of these people were settled in the Roman province of Pannonia (modern western Hungary) and others along the right bank of Danube to its mouth in Dobruja. Dacians were so numerous in Balkan peninsula that diocese Moesia were divided into diocese Dacia and diocese Macedonia in 337 CE.
https://www.sciencedirect.com/science/article/abs/pii/S1872497322001089
I'm pretty sure that we will find, on the longer run, different waves of E-V13 entering the Balkans, from very early (Urnfield) to the latest (Slavs), with the bulk coming from Thracians and Dacians. I have little doubt that some more Northern-Carpathian leaning subclades of E-V13 spread to the Balkans with the Carpi and Costobocci, the main free Dacian tribes, fairly late. Not necessarily the bulk of it, but I wouldn't wonder if that turns out to be a contributing factor.