Table 1: Sampling localities, sample sizes, and the proportion of hybrid individuals for populations analyzed in this study.

CodeLocalityLatitudeLongitude Proportion of hybrids (80–20)Proportion of hybrids (90–10)

3MT: Custer National Forest no. 145.1−108.540.000.00
4WY: Bighorn National Forest no. 144.8−107.380.000.00
5WY: Bighorn National Forest no. 244.6−107.720.000.00
6CO: Roosevelt National Forest40.7−
7MT: Custer National Forest no. 245.7−10650.000.00
8WY: Medicine Bow National Forest42.4−105.330.000.00
9ND: Little Missouri National Grassland46.8−103.5130.000.00
10SD: Custer National Forest45.3−103.2100.000.00
11WY: Sand Creek*44.5−104.1140.360.50
12NE: White River*42.6−103.580.380.50
13SD: Black Hills National Forest43.7−103.850.200.20
14NE: Ponderosa State Wildlife Management Area42.6−103.370.571.00
15SD: The Nature Conservancy Whitney Preserve43.3−103.630.000.00
16NE: Nebraska National Forest42.8−102.980.251.00
17SD: Ft. Meade National Recreation Area44.4−103.540.500.50
18NE: Nenzel*42.8−
19NE: The Nature Conservancy42.8−100180.000.00
 Niobrara Valley Preserve
20SD: Carpenter Game Production Area43.7−99.5130.080.08
21ND: The Nature Conservancy46.3−97.340.000.00
 Pigeon Point Preserve
22NE: Wiseman State Wildlife Area42.8−97.1100.000.00
23SD: Newton Hills Game Production Area43.2−96.6130.000.08

*Access to these localities generously provided by private landowners.