Table 4. Proportional dietary contributions for grizzly bears sampled in Cooke City Basin, Montana, 2007–2009.
Parameters were estimated by IsotopeR using δ13C/δ15N concentration dependence models with group structure. These models were ranked #2 and #3 overall when comparing DICRescaled values (Table 2).
| Credible interval | ||||||
|---|---|---|---|---|---|---|
| Source | Sex/Yr | 1 SD | 2.5% | 50% | 97.5% | |
| Plants | F | 56.4 | 11.3 | 32.9 | 56.6 | 32.9 |
| M | 62.4 | 16.9 | 28.1 | 62.5 | 28.1 | |
| Ungulates | F | 6.3 | 6.8 | 0.0 | 4.8 | 0.0 |
| M | 7.0 | 8.8 | 0.0 | 4.0 | 0.0 | |
| Whitebark | F | 37.3 | 10.9 | 17.8 | 36.7 | 17.8 |
| M | 30.6 | 15.8 | 1.8 | 29.4 | 1.8 | |
| Plants | 2007 | 48.1 | 17.6 | 11.6 | 48.7 | 82.0 |
| 2008 | 51.5 | 16.1 | 17.1 | 52.2 | 81.9 | |
| 2009 | 60.5 | 11.1 | 38.7 | 60.4 | 82.6 | |
| Ungulates | 2007 | 7.8 | 7.1 | 0.1 | 6.2 | 25.5 |
| 2008 | 9.4 | 8.1 | 0.1 | 7.7 | 29.1 | |
| 2009 | 9.5 | 6.9 | 0.2 | 8.6 | 24.6 | |
| Whitebark | 2007 | 44.1 | 17.7 | 12.2 | 42.8 | 83.1 |
| 2008 | 39.1 | 15.5 | 12.1 | 37.7 | 73.6 | |
| 2009 | 30.0 | 10.4 | 10.6 | 29.5 | 51.5 | |