Roth, Christina, Once upon a time in the West : paleogenetic analyses on Mesolithic to Early Bronze Age individuals from the Iberian Peninsula, Dissertation, Mainz : Univ. 236 Seiten, 2016Not really sure what to make of these mtDNA results or the author's conclusions. But this part is interesting, because mtDNA U5a is relatively common in ancient groups with inflated Eastern European Hunter-Gatherer (EHG) genome-wide ancestry, such as Yamnaya and Corded Ware.
The two Bell Beaker groups show significant differences on haplogroup level to Chalcolithic non-Bell Beaker from the Southern Meseta and all Early and Late Neolithic groups with strong genetic hunter-gatherer background (NSE, CPE, and EVN) (see table 13, p.91). They are clearly separated from all other Chalcolithic groups in PCA, cluster analysis, and MDS (see fig. 16–18, pp.89–96). Furthermore, AMOVA supports – though not significant – separation of Bell Beaker and non-Bell Beaker groups (see table 21, p.104). The Fisher-test with superordinate groups supports significant differences between Chalcolithic Bell Beaker and non-Bell Beaker groups as well (see table 14, p.92). Genetic differences between the two Bell Beaker groups are low but not significant while higher and mostly significant FST values to the Chalcolithic groups of the Southern Meseta and East Spain can be observed (see table 16, p.94). ... A common feature that is shared between the two Bell Beaker groups and that separates them from other Chalcolithic groups is the low amount of haplogroup H and the presence of haplogroup U5a, which was – apart from the Bell Beaker groups – only found in one Late Neolithic individual from Portugal and the Portuguese Chalcolithic site of Perdigões.