Fig. 2

Genetic history of the wild grapes sampled. A Genetic structure of samples detected by the structure analysis (K = 7). Hybrid samples are not included but see Additional File 2: Figure S1. B The phylogenetic tree in black corresponds to the consensus tree. Each node has a pie chart with the black portion indicating the proportion of supporting bootstrap replicates. The red phylogenies in the background correspond to 500 highly supported consensus trees (median bootstrap support > 70%) based on separate 10-kb windows throughout the genome. The scale bar represents 0.2 average substitutions per nucleotide. C Diagram of the tree models used for the nine trios that had significant introgression signals, structured from top to bottom of each tree as follows: outgroup, P3, P2, and P1. In this diagram, the species are abbreviated as mrot: M. rotundifolia, vari: V. arizonica, vcan: V. candicans, vmon: V. monticola, vber: V. berlandieri, vrip: V. riparia and vgir: V. girdiana. D Examples of SDM overlaps from pairs of species with evidence of introgression projected in one of three periods: Pleistocene, Holocene and the Present. The inset in the bottom left corner shows the area of overlap per period. The overlap corresponds to the number of overlapped pixels from the raster objects at a 2.5-arcsecond resolution. See Additional File 2: Figures S5, S6 and S7 for additional SDMs featuring pairs of species