They are typical of Meditaranian people, but with less Indo-Europeean influence than the North Italians and Greeks.
I have been told that this is dogma on anthrofora sites like The Apricity, but it is total bunk.
Ed.It is first of all based on some bizarre notion that island Greeks, and Pontic Greeks, and rather recently expelled Greeks from the Aegean shores of Asia Minor, are not as "Greek" as mainland ones. Just who made that decision? Next time I'm invited to an event at the Greek Orthodox Church and Community Center, I'll be sure to inform them that half of them are not Greek.
In addition, it is, to my knowledge, totally based on 23andme components that are themselves highly problematic for people in the Balkans including the Greeks. I would suggest taking a look at the reference populations used by 23andme. The reference population for the Balkans includes the Maltese, so any "southern" or "Mediterranean" or "West Asian" percentages for that matter would be in addition to what is already present in the reference sample. The results on 23andme are fun, but
not for the kind of analysis which we do on this site.
I would suggest taking a look at the Dodecad runs instead, which do a much better job of teasing out relationships between western and southern Europeans, in my opinion, even versus more recent Eurogenes runs which divide Europe basically east/west, and which thus obscure some of these relationships. In Dodecad, the only Greek population is the Dodecad volunteer one, which cannot be held to be representative as we don't know if they were all or mainly from the mainland. Other analyses use a sample from Thessaly, I believe, which is in far northern Greece. When samples are taken from the islands and different communities in Greece and properly analyzed, then we can look at the situation.
In addition, you may have missed it, and I would bet a large sum that the people on anthrofora have either missed it or don't understand it, but the "Indo-Europeans" were apparently a highly mixed population with large amounts of EEF. Slavic or Northern European input does not equate to "Indo-European" precisely. It's a lot more complicated than that.
I've said all I have to say on the subject and won't be responding further.
I also think that someone should come up with some sort of vaccine inoculating people against an obsession with Sicilians. It's like a disease on anthrofora. Sicilians are ascinating people, no doubt, but this "obsession" is obviously the product of some bizarre agenda of the most unsavory kind.