Table 1.

Genomic Characteristics of Putative Introgressed Regions among the Ten Trios (corresponding to fig. 5B and supplementary fig. S24B, Supplementary Material online).

Trio	P1	P2	P3	f 4	Nucleotide Diversitya		Recombination Ratea		Deleterious Mutation Loada		Introgression Sweep Signalsa		F ST a	d xy a
					P2	P3	P2	P3	P2	P3	P2	P3
Ptrs_Prot_Palb	Populus tremuloides	P. rotundifolia	P. alba	7.53%	1.066*	1.091*	1.231**	1.240**	0.886*	0.773**	1.159	1.549**	1.009	0.943**
Ptrs_Pdav_Palb	P. tremuloides	P. davidiana	P. alba	7.06%	1.089**	1.117*	1.332**	1.292**	0.914	0.825*	0.885	1.560**	0.971*	0.946**
Ptrs_Ptra_Palb	P. tremuloides	P. tremula	P. alba	5.99%	1.130**	1.172*	1.283**	1.308**	0.925	0.930	1.038	2.051**	0.913**	0.913**
Ptrs_Pdav_Pade	P. tremuloides	P. davidiana	P. adenopoda	2.02%	1.236**	2.139**	1.908**	0.825	1.058	0.999	0.885	4.883**	0.643**	0.834**
Prot_Pdav_Ptra	P. rotundifolia	P. davidiana	P. tremula	9.73%	1.070**	1.043*	1.389**	1.314**	0.946	0.972	1.347*	1.762**	0.854**	0.952**
Prot_Pdav_Ptrs	P. rotundifolia	P. davidiana	P. tremuloides	4.29%	1.070**	1.027	1.087	1.094*	0.999	0.974	0.924	0.622	0.911**	0.936**
Ptrs_Prot_Pade	P. tremuloides	P. rotundifolia	P. adenopoda	2.64%	1.376**	2.053**	1.755**	0.868	1.085	1.054	1.301	4.640**	0.654**	0.801**
Ptrs_Palb_Pade	P. tremuloides	P. alba	P. adenopoda	3.84%	1.229*	1.392**	1.516**	1.124*	0.891	0.875	1.454	2.513**	0.943**	0.895**
Ptrs_Ptra_Pade	P. tremuloides	P. tremula	P. adenopoda	0.36%	1.242*	1.999**	1.260	0.731	0.996	1.137	0.239	2.947*	0.627**	0.740**
Prot_Ptra_Ptrs	P. rotundifolia	P. tremula	P. tremuloides	10.72%	1.002	0.989	1.148**	1.252**	0.930	0.959	0.633	0.515	0.992	0.915**

Note.—^aThe estimates of the observed values for each statistic relative to the averages of 1,000 genomic randomizations, with asterisks denoting the assessed significance (*P < 0.05; **P < 0.01).