Research Article
The Role of Environmental Heterogeneity in Maintaining Reproductive Isolation between Hybridizing Passerina (Aves: Cardinalidae) Buntings
Table 1
Sampling localities, sample sizes, and the proportion of hybrid individuals for populations analyzed in this study.
| Code | Locality | Latitude | Longitude | | Proportion of hybrids (80–20) | Proportion of hybrids (90–10) |
| 1 | WA | 47.8 | −118.9 | 29 | — | — | 2 | ID | 44.1 | −116.2 | 3 | — | — | 3 | MT: Custer National Forest no. 1 | 45.1 | −108.5 | 4 | 0.00 | 0.00 | 4 | WY: Bighorn National Forest no. 1 | 44.8 | −107.3 | 8 | 0.00 | 0.00 | 5 | WY: Bighorn National Forest no. 2 | 44.6 | −107.7 | 2 | 0.00 | 0.00 | 6 | CO: Roosevelt National Forest | 40.7 | −105.2 | 7 | 0.14 | 0.14 | 7 | MT: Custer National Forest no. 2 | 45.7 | −106 | 5 | 0.00 | 0.00 | 8 | WY: Medicine Bow National Forest | 42.4 | −105.3 | 3 | 0.00 | 0.00 | 9 | ND: Little Missouri National Grassland | 46.8 | −103.5 | 13 | 0.00 | 0.00 | 10 | SD: Custer National Forest | 45.3 | −103.2 | 10 | 0.00 | 0.00 | 11 | WY: Sand Creek* | 44.5 | −104.1 | 14 | 0.36 | 0.50 | 12 | NE: White River* | 42.6 | −103.5 | 8 | 0.38 | 0.50 | 13 | SD: Black Hills National Forest | 43.7 | −103.8 | 5 | 0.20 | 0.20 | 14 | NE: Ponderosa State Wildlife Management Area | 42.6 | −103.3 | 7 | 0.57 | 1.00 | 15 | SD: The Nature Conservancy Whitney Preserve | 43.3 | −103.6 | 3 | 0.00 | 0.00 | 16 | NE: Nebraska National Forest | 42.8 | −102.9 | 8 | 0.25 | 1.00 | 17 | SD: Ft. Meade National Recreation Area | 44.4 | −103.5 | 4 | 0.50 | 0.50 | 18 | NE: Nenzel* | 42.8 | −101.1 | 4 | 0.25 | 0.25 | 19 | NE: The Nature Conservancy | 42.8 | −100 | 18 | 0.00 | 0.00 | | Niobrara Valley Preserve | | | | | | 20 | SD: Carpenter Game Production Area | 43.7 | −99.5 | 13 | 0.08 | 0.08 | 21 | ND: The Nature Conservancy | 46.3 | −97.3 | 4 | 0.00 | 0.00 | | Pigeon Point Preserve | | | | | | 22 | NE: Wiseman State Wildlife Area | 42.8 | −97.1 | 10 | 0.00 | 0.00 | 23 | SD: Newton Hills Game Production Area | 43.2 | −96.6 | 13 | 0.00 | 0.08 | 24 | MN | 44.9 | −93.7 | 10 | — | — | 25 | IL | 40.5 | −88.9 | 10 | — | — | 26 | MI | 42.3 | −83.7 | 7 | — | — |
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*Access to these localities generously provided by private landowners.
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