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Can any clarification be given about what these numbers mean? Average admixture in an individual from each region? Relative percentage of people with some degree of Yamnaya-like ancestry?
It's this one.
The title should then be:
Thought that is self-evident that this is a sample. They can't dna test the entire populace.
I'm inherently skeptical about things like this when the methodology is not shared. It could be a very low sample size meaning the data is noisy.
G25 is open access so you can see all the samples yourself. For the Italian regions it's around a dozen individuals each, give or take. Not optimal, but good enough - as you can see the broader geographic trends bear out.
I thought it would be higher, especially in central italy and sicily
Sicily being so low makes sense because islands are extremely difficult to change much genetically unless there’s a wholesale and at least somewhat intentional population replacement. That never rly happened in Sicily.
Nice map! Can you share the model/sources you used?
Highest percentages seem to correlate with highest distribution of R1a1a in Italy. Which accordingly is the northeast. Looking forward to more Italian aDNA studies that hopefully can some how hone in more on remains from the time of the Urnfield culture (if at all possible) and then the early Iron Age transition.
I very much doubt the map is accurate - it places Northern Italian's steppe ancestry at higher proportions than German or English populations. The only way I can see this map making any sense is of it records / displays each region's highest scoring individual steppe proportion...which is essentially pointless. Looking forward to the OP clarifying this.