Table 2.
Estimated resource selection function coefficients comparing native bison and introduced cattle at the Tallgrass Prairie Preserve, OK, USA. Data were reduced to the months of April–September and equal frequency sampling to appropriately compare selection between the two species. Model parameters include distance to water (m), distance to fire patch edge (m), slope (%), elevation (m), fire patch area (ha), northing and easting (°; both derivatives of aspect), woody vegetation, and time since fire (days). Standardized variables are shown for coefficient comparison. Letters indicate overlap in confidence interval (95%) between bison and cattle; confidence intervals calculated using bootstrapping procedures (1000 iterations)
| Bison | Cattle | |
|---|---|---|
| Intercept | −1.8795 | 3.2734 |
| Time since fire | −1.6072 | −0.7438 |
| Distance to water | 0.0724 | 0.0075 |
| Slope | −0.5338 | −0.2242 |
| Distance to patch edge | −0.0425 | −0.0990 |
| Woody vegetation | −0.8216 | 1.1566 |
| Elevation | 0.2095 | −0.0531 |
| Patch area | −0.4735 | − |
| Northness | − | −0.0170 |
| Eastness | − | −0.0040 |
| Time since fire × distance to water | 0.1656a | 0.1534a |
| Time since fire × slope | −0.2554 | −0.2097 |
| Time since fire × distance to patch edge | −0.2004 | 0.0453 |
| Time since fire × woody | 0.3705b | 0.3690b |
| Time since fire × elevation | −0.0446 | −0.1096 |
| Time since fire × patch area | −0.7287 | − |