Proposed routes of spread of six vulgare genepools, according to the K = 8 model.

Based on the geographical distribution of population structure in 351 vulgare accessions. Proposed routes of spread are indicated by solid or dashed lines, coloured according to the six vulgare genepools. Solid lines: barley genepool population structure clearly maps onto attested routes of agricultural spread. Dashed lines: routes of spread are more speculative, based on sparser distribution of barley genepools and/or archaeobotanical data. Map generated using ArcMap v. 10.2, and NASA Blue Marble: Next Generation satellite imagery, which was produced by Reto Stöckli and obtained from NASA’s Earth Observatory (NASA Goddard Space Flight Center). See: http://earthobservatory.nasa.gov/Features/BlueMarble/.