PMC:2668061 / 23793-24697 JSONTXT

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    2_test

    The Iberian Peninsula is often regarded as a source for northward postglacial expansions2,3,5 and a sphere of Neolithic influence from the Near East.38 Our study suggests that its recent history has also had a profound influence on its diversity of Y-chromosomal lineages. Historical accounts should allow us to account for this, but they are sometimes written long after the incidents they describe, are usually scarce, and are always recorded with a particular audience in mind (and, therefore, are subject to bias).17 The marked genetic differentiation between the contributing populations in this case allows an attempt to disentangle their influence; such recognition may be more difficult when source populations for migrations or invasions are only slightly differentiated from recipient populations, as in the case of the Anglo-Saxon60 or Viking61 contributions to the British Isles, for example.