It's on this chart, Sicilian is broken down. The differences are not that great but you can see that North European, Arabic, and North African are lowest in the central Sicily group and highest in the west. Different Greeks are on there too (mainland Greeks as you see have MUCH more North European than Sicilians).
https://docs.google.com/spreadsheet/ccc?key=0Aqr2nbGXpVFndHo5TnJZR2VFYW1lcExMNGUyWTVheVE#gid=0
and about the Iberian R1b I mean that Sicilian subclades of R1b are not the same as the ones in Iberia, therefore it is unlikely they got there though any sort of Iberian ancestry.
Sorry for the late response...
Thanks for the link...I made a sort of mini chart for myself to track the numbers. I may have missed something, but I don't find data for Eastern Sicilians (Catania area etc.) What I do find is a break-out for Central Sicily, Western Sicily, and Southern Sicily.
In terms of the clusters, the main ones that would apply to Sicilians or any Europeans, would be the Southwestern Cluster, the North Baltic and Baltic Finnic Cluster (there is no Northern European cluster), Caucasian (by which perhaps he means all West Asian), and "Arabic", which is an anachronism...if this is meant to track relatively old clusters and migrations, Arabs didn't exist then, but maybe I'm being too picky there.
So, these are the figures for the three Sicilian groups in order of Central Sicily/West Sicily/ South Sicily for the major components I mentioned:
North Baltic and Baltic/Finn: 8.61/10.60/8.67
Southwest European: 25.37/26.36/27.20
Caucasus: 35.39/33.02/34.80
Gedrosia:9.39/10.98/10.83
"Arabic": 6.73/8.58/8.01
For what you are calling the Northern European component, which in actuality is only a *Baltic* component, there is a 2 % difference between the number for the Western Sicilian, i.e. perhaps Palermo? although it doesn't say, compared to the Central and Southern Sicilian, which is hardly significant given that we're talking about *one* person from Palermo. I suppose you have in mind some sort of Norman impact there, but as I said, there isn't enough data to support that kind of inference, in my opinion.
In terms of the Southwest European, the center, because of the Lombard towns, might be expected to be a little higher in this, and instead it's the lowest, although we're only talking about a 2% spread total.
The two percent drop in Caucasus in Western Sicily compared to Central Sicily might mean that additional population migrations there cut it down a tiny bit from the rest of the island, but again, this is pretty insignificant.
Gedrosia, if, in line with some current speculation, it refers to perhaps R1b related Indo-European spread, should be higher again, in the center, and instead it's lower, albeit by *one* percent.
As for "Arabic", if one were to speculate, one might think it might show up a little lower in the center, as the Normans and the Hohenstaufens were on a mission to ethnically cleanse the area, which had become a Moorish refugia, and this is why Northern Italians were brought in to establish the "Lombard" cities. (The actual source of the population was Piemonte, Liguria, even Toscana, as well as Lombardia.) It is indeed about 2% lower than in the West, although only 1% lower than in the south.
I have to say that I am not inclined to place very much faith in these results. First of all, the creator of this run only had data from 3 Sicilians, one from each area. In my opinion, it's impossible to draw any real conclusions based on that data, especially when the numbers are actually broken out and the differences are so slight.
In terms of the analysis as a whole, it has so many components (27!) that I'm seeing an incredible amount of "noise" in some of these results. Also, it's not helpful when the results include such bottlenecked populations as the Kalash. Even less helpful is the fact that it's not very informative for anyone who isn't from the Baltics or northeastern Europe in general. That's particularly true for southern Europeans...there's only a southwestern component; no southeastern component, no northwestern component, and actually, not even a North European component...all that I see are some Baltic components.
Btw, I can't see how anyone could draw phenotypic differences between the various areas of the island based on 1% differences in admixture components.
In my opinion, the Sicilians seem to be a pretty homogenous bunch, well mixed and stirred...I think the same is true in general of the southern Italians, whereas there are distinct differences in some areas of the north, not only in comparison to the south, but in comparison to one another. My current working hypothesis is that this can be laid to the door of politics over the last 700 to one thousand years. The Kingdom of the Two Sicilies encompassed all of the South from just south of Rome to Sicily. The Byzantine era also overlaid a lot of the South.
In the north it was different...many areas ruled themselves...Venice for example, was it's own Republic until almost the 1800's. Tuscany was pretty autonomous as well. Areas like Liguria and Lombardia likewise ruled themselves as city-states for a long time, before coming under the rule of the French in the first case, and Austria Hungary in the second. It was much harder for northern Italians to move location to what was in some cases virtually another county, and so I think there was a certain amount of drift and preservation of older migration patterns.
Anyway, that's my ti cents worth...