Monday, August 24, 2015
Pre- and Post-Kurgan Europe
The Principal Component Analysis (PCA) below is based on four sets of D-statistics. The second image shows what they are and how they affect the components. The datasheet is available here. If you don't know what EHG, SHG and WHG stand for, see here.
Note that the post-Kurgan Europeans are shifted east, towards the Bronze Age steppe groups (most of which are in fact classified as Kurgan cultures), relative to the pre-Kurgan Europeans. Coincidence? Certainly not. Interestingly, the West Asians show a similar shift to the east, although it's not yet clear who caused it and when.
In this analysis I used samples from the Allentoft et al., Haak et al. and Lazaridis et al. datasets, all of which are publicly available. The latter two are found at the Reich Lab site here.
Update 12/09/2015: Matt posted these graphs in the comments. The first graph shows Yamnaya-related ancestry proportions for a series of points along the Yamnaya-Middle Neolithic continuum, which can be used to estimate Yamnaya-related admixture in samples that cluster near these points.
Smarter than the average bear