All right, I've read most of the comments in this forum and I get the impression that most people commenting have solid and unbiased arguments regarding the ancient history of the Iberian Peninsula.
This study has shed many light into previously unknown facts such has the I1 lineage (possible since it lacks confirmation) and the existence of so called north african autosomal dna in the whole of Iberia.
My biggest problem regarding this study is the fact that people specialized in genetics don't consult with other investigators in the universities which is a shame since after all we are all trying to interpret the "results" of the study when a historian and an archaeologist could do it with much better accuracy and I am saying this because I attended one of the universities involved in this study and I know the procedures (most studies are done by people of the same field without collaboration ( this happens because most Portuguese universities have different fields of study in different university campus).
Now, about the study, the presence of North African admixture in pre islamic iberia is present as it was expected and has expected the islamic occupation most likely increased the quantity of that admixture in the whole peninsula but reduced it when it comes to localized admixture for instance in Andalucia because of the mass expulsions of people some of which were christian converts to Islam who had already a lot of north african admixture and these local south iberians were somewhat replaced by northern migrants with less north african admixture.
If anyone complains that there are almost no samples taken from north Portugal, Galicia and the northwest of Spain in general, that's because the soil is very acid and the bones or any Dna trace aren not found in ancient graveyards, only what's left of the pottery and sometimes precious metals and stone coffins are found.
Finally and I know it's a lot to read, and it's someone obsessed with Iberian History here, but in the Islamic period it is quite likely that while the elites would have had some issues with inter-marriage between catholics and muslims, the same cannot be said about the common people, so it is likely that the north african admixture spread both through male and female alike, still, I still find it hard to believe that the north african admixture has already become so dispersed that it is equal between a Galician/Asturian and someone from south Spain but perhaps someone can enlighten me about that, though about the Portuguese case it still perplexes me how the Portuguese are all very close genetically since the muslims never got to occupy the northern river valleys in Portugal nor the mountainous and isolate reaches othe Minho and Tras-os-Montes regions.
This study has shed many light into previously unknown facts such has the I1 lineage (possible since it lacks confirmation) and the existence of so called north african autosomal dna in the whole of Iberia.
My biggest problem regarding this study is the fact that people specialized in genetics don't consult with other investigators in the universities which is a shame since after all we are all trying to interpret the "results" of the study when a historian and an archaeologist could do it with much better accuracy and I am saying this because I attended one of the universities involved in this study and I know the procedures (most studies are done by people of the same field without collaboration ( this happens because most Portuguese universities have different fields of study in different university campus).
Now, about the study, the presence of North African admixture in pre islamic iberia is present as it was expected and has expected the islamic occupation most likely increased the quantity of that admixture in the whole peninsula but reduced it when it comes to localized admixture for instance in Andalucia because of the mass expulsions of people some of which were christian converts to Islam who had already a lot of north african admixture and these local south iberians were somewhat replaced by northern migrants with less north african admixture.
If anyone complains that there are almost no samples taken from north Portugal, Galicia and the northwest of Spain in general, that's because the soil is very acid and the bones or any Dna trace aren not found in ancient graveyards, only what's left of the pottery and sometimes precious metals and stone coffins are found.
Finally and I know it's a lot to read, and it's someone obsessed with Iberian History here, but in the Islamic period it is quite likely that while the elites would have had some issues with inter-marriage between catholics and muslims, the same cannot be said about the common people, so it is likely that the north african admixture spread both through male and female alike, still, I still find it hard to believe that the north african admixture has already become so dispersed that it is equal between a Galician/Asturian and someone from south Spain but perhaps someone can enlighten me about that, though about the Portuguese case it still perplexes me how the Portuguese are all very close genetically since the muslims never got to occupy the northern river valleys in Portugal nor the mountainous and isolate reaches othe Minho and Tras-os-Montes regions.