Yes the E-M81 comes from Neolithic times in 5000 BCE , you can see it in the map I have posted in the top of this page, and obviously has little to do with Islamic occupation. France and Italy have also precence of E-M81. Anyways , the level is minimal , about 1.5 % (I don't agree with the "unrelated to Neolithic, but it is just to show the levels of E-M81) :
"Two subclades of North African Y-chromosome haplogroup E3b and Middle Eastern haplogroup J (labeled E-M81 and J-M267) are considered unrelated to the Neolithic migrations into Europe, making them useful in detecting historical admixture from Berbers and Arabs or earlier Semitic peoples. These markers exist at combined frequencies of 3% in Catalans of Northern Spain and 6.4% in Andalusians of Southern Spain
(for a total of between 1.5% and 3.2% admixture), confirming that gene flow from Phoenicians/Carthaginians and Islamic Moors was minimal."
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A European wide study including Spaniards states: No significant correlation is apparent between North African admixture and geography. Genetic exchanges across the Mediterranean Sea, and especially in its western-most part where the geographic distance between continents is smallest (Spain), seem to have been limited or very limited, establishing the North African contribution at between 2.5% and 3.4%. [39][40]
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Haplogroup composition of the ancient Iberians was very similar to that found in modern Iberian Peninsula populations, suggesting a long-term genetic continuity since pre-Roman times [6] [7] [8].
In fact, a European wide study including Spaniards states: No significant correlation is apparent between North African admixture and geography. Genetic exchanges across the Mediterranean Sea, and especially in its western-most part where the geographic distance between continents is smallest (Spain), seem to have been limited or very limited, establishing the North African contribution at 2.5/3.4%. [10] [11]
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"Finalmente, el flujo bidireccional a través del Estrecho de Gibraltar ha sido delimitado: la contribución genética de cromosomas Y europeos al mapa genético del Noroeste africano es aproximadamente de un 4%, y las poblaciones del Noroeste africano han aportado un 7% de los cromosomas Y ibéricos. El gobierno islámico de España, el cual empezó en el 711 D.C. y depués de casi 8 siglos, ha dejado sólamente una mínima aportación al actual mapa genético de cromosomas Y ibéricos.".
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Un amplio estudio publicado en 2007 que empleó 6501 ejemplos de cromosomas Y de 81 poblaciones proponía que lo que interpretaba como contribución norteafricana al
acervo genético masculino de España alcanzaba el 5.65%. Otros estudios consideran que no excede del 3.6%.
[46] [47] [48] [49] [50] [51] [52]
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A wide ranging study (published 2007) using 6,501 unrelated Y-chromosome samples from 81 populations found that: "Considering both these E-M78 sub-haplogroups (E-V12, E-V22, E-V65) and the E-M81 haplogroup, the contribution of northern African lineages to the entire male gene pool of Iberia is 5.6%."
[41]