I have calculated the provincial percentages of G2a in Italy based on the recent study by Boattini et al.
The new data significantly alters the known distribution of G2a across the peninsula. Extremely high frequencies (20-25%) were observed in Abruzzo, Molise, Basilicata and Calabria. The frequencies in northern Italy are also considerably higher than in past studies. On the other hand, the data for Sardinia is a bit lower.
The hotspots in central Calabria and around Matera match Achaean Greek colonies (from central Peloponnese).
The high concentration of G2a along the Apennines are probably a relic of Neolithic populations who sought refuge in the mountains after successive waves of invaders (Italics, Etruscans, Greeks) took the coastal and lowland areas. The same phenomenon can be observed a bit everywhere in Europe (Alps, Sardinia, Corsica, Thessaly, Caucasus).
North Italy
In Cuneo, south-west Piedmont, 3 out of 30 samples are G2a (10%),.
In Savona/Genova, central Liguria, 2 out of 50 samples are G2a (4%).
In Como, north-west Lombardy, 3 out of 41 samples are G2a (7.5%).
In Brescia, north-east Lombardy, 5 out of 39 samples are G2a (13%).
In Vicenza, central-west Veneto, 2 out of 40 samples are G2a (5%).
In Treviso, central-east Veneto, 3 out of 30 samples are G2a (10%).
In Bologna, central Emilia-Romagna, 3 out of 29 samples G2a (10.5%).
Central Italy
In La Spezia-Massa, north-west Tuscany, 2 out of 24 samples are G2a (8.5%).
In Pistoia, central-north Tuscany, 1 out of 13 samples are G2a (7.5%).
In Grosetto-Siena, southern Tuscany, 4 out of 86 samples are G2a (4.5%) + one G1 sample.
In Foligno, central-east Umbria, 6 out of 37 samples are G2a (16%) + one G1 sample.
In Macerata, central-east Marche, 4 out of 40 samples are G2a (10%).
South Italy
In L'Aquila, Abruzzo, 5 out of 23 samples are G2a (21.5%).
In Campobasso, Molise, 7 out of 29 samples are G2a (24%).
In Benevento, Campania, 4 out of 36 samples are G2a (11%) + one G2c sample.
In Matera, Basilicata, 6 samples out of 25 are G2a (24%) + one G1 sample.
In Lecce, Apulia, 3 out of 39 samples are G2a (7.5%).
In Cosenza/Catanzaro/Crotone, Calabria, 8 out of 38 samples were G2a (21%).
In Catania, eastern Sicily, 5 out of 62 samples are G2a (8%).
In Ragusa, southeast Sicily, 5 out of 44 samples are G2a (11.5%).
In Agrigento, southwest Sicily, 6 out of 42 samples are G2a (14.5%).
In Olbia/Tempio/Nuoro, north-east Sardinia, 5 out of 40 samples are G2a (12.5%).
In Oristano, central-west Sardinia, 6 out of 42 samples are G2a (14.5%).
The new data significantly alters the known distribution of G2a across the peninsula. Extremely high frequencies (20-25%) were observed in Abruzzo, Molise, Basilicata and Calabria. The frequencies in northern Italy are also considerably higher than in past studies. On the other hand, the data for Sardinia is a bit lower.
The hotspots in central Calabria and around Matera match Achaean Greek colonies (from central Peloponnese).
The high concentration of G2a along the Apennines are probably a relic of Neolithic populations who sought refuge in the mountains after successive waves of invaders (Italics, Etruscans, Greeks) took the coastal and lowland areas. The same phenomenon can be observed a bit everywhere in Europe (Alps, Sardinia, Corsica, Thessaly, Caucasus).
North Italy
In Cuneo, south-west Piedmont, 3 out of 30 samples are G2a (10%),.
In Savona/Genova, central Liguria, 2 out of 50 samples are G2a (4%).
In Como, north-west Lombardy, 3 out of 41 samples are G2a (7.5%).
In Brescia, north-east Lombardy, 5 out of 39 samples are G2a (13%).
In Vicenza, central-west Veneto, 2 out of 40 samples are G2a (5%).
In Treviso, central-east Veneto, 3 out of 30 samples are G2a (10%).
In Bologna, central Emilia-Romagna, 3 out of 29 samples G2a (10.5%).
Central Italy
In La Spezia-Massa, north-west Tuscany, 2 out of 24 samples are G2a (8.5%).
In Pistoia, central-north Tuscany, 1 out of 13 samples are G2a (7.5%).
In Grosetto-Siena, southern Tuscany, 4 out of 86 samples are G2a (4.5%) + one G1 sample.
In Foligno, central-east Umbria, 6 out of 37 samples are G2a (16%) + one G1 sample.
In Macerata, central-east Marche, 4 out of 40 samples are G2a (10%).
South Italy
In L'Aquila, Abruzzo, 5 out of 23 samples are G2a (21.5%).
In Campobasso, Molise, 7 out of 29 samples are G2a (24%).
In Benevento, Campania, 4 out of 36 samples are G2a (11%) + one G2c sample.
In Matera, Basilicata, 6 samples out of 25 are G2a (24%) + one G1 sample.
In Lecce, Apulia, 3 out of 39 samples are G2a (7.5%).
In Cosenza/Catanzaro/Crotone, Calabria, 8 out of 38 samples were G2a (21%).
In Catania, eastern Sicily, 5 out of 62 samples are G2a (8%).
In Ragusa, southeast Sicily, 5 out of 44 samples are G2a (11.5%).
In Agrigento, southwest Sicily, 6 out of 42 samples are G2a (14.5%).
In Olbia/Tempio/Nuoro, north-east Sardinia, 5 out of 40 samples are G2a (12.5%).
In Oristano, central-west Sardinia, 6 out of 42 samples are G2a (14.5%).
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