Quote:
In order to gain insights in the past demographic dynamics of the two Greek
populations analysed a Bayesian coalescent approach was used using Y-chromosomes
STR data. The adoption of agriculture should have favoured a rapid and strong
demographic expansion which probably has left a detectable genetic footprint
(Ammerman & Cavalli-Sforza 1984; Boyle & Renfrew 2000). Estimates of time since
expansion points towards an earlier adoption of agriculture in Euboea, approximately
8,8Kya whereas for Korinthia the estimate was slightly more recent (7Kya) dating more
closely to the late Neolithic horizon. The same Bayesian approach was also used to
estimate the times since expansion of the main Greek haplogroups in order to assess the
haplogroups that could be associated with the Neolithic transition in Greece. The only
haplogroup that showed times since expansion compatible with the Neolithic is J2aM410
which has already been associated with Neolithic transition by several other
studies (Sengupta et al., 2006; King et al., 2008; Battaglia et al., 2009). All the other
haplogroups shows expansion dates consistent with the late Neolithic/initial Bronze Age
horizon (R1b-M269 and E1b-V13) and the initial/late Bronze Age horizon (R1a-M17,
G2a-P15, I2-M438, J1-M267 and J2b-M102).
Quote:
aplogroup Frequency Distribution
From the total of 75 binary markers genotyped, 50 turned out to be informative. The most parsimonious relationships and the frequencies of the corresponding haplogroups are presented in Figure 2.
Western Eurasian haplogroups were found to encompass almost the entire Bulgarian Y-chromosome pool. Contributions from Central Asia (Hg C-M217) [40], [41], Northern Eurasia (Hg N-M231) and South West Asia (Hg Q-M242 derivatives, Hg L-M61 and Hg R-M124) [32], [42] were detected at almost negligible frequencies.
The most prevalent haplogroups in Bulgarians are I-M423 (20.2%) and E-V13 (18.1%). They represent the autochthonous and nearly endemic sub-clades of I-P37 and E-M78 in Southeastern Europe, respectively [34], [43]. Third in frequency is the common Eurasian haplogroup R-M17, which was found in 17.5% of Bulgarians, with 42.9% of them belonging to the European specific R-M458 sub-clade [36]. Haplogroup R-L23*, the eastern branch of the western Eurasian R-M269 haplogroup [37], relates the paternal ancestry of 5.2% of Bulgarians, representing nearly half of the M269 derived Y chromosomes. Next in frequency is Hg I-M253 (4.3%), which accounts for the majority of haplogroup I-M170 individuals in Northern Europe [44], [45]. It is followed by two J-M172 sub-branches, namely J-M241 and J-M530, observed at a frequency of 3.8% and 2.4%, respectively. The rest of the phylogenetically terminal haplogroups harboured frequency values of less than 2%.
These are four separate sources from four different researches - to cut a long story rt as I understand you have comprehension issues. I2a is proto European from first or old Europe most probably with J1. It was there before the neolithic expansion of E & G
