Table 3. Mean estimated percentages of daily digestible energy provided by seven primary food types within 14 diets of grizzly and black bears identified by principal components and cluster analyses of field data, Grand Teton National Park, Wyoming, USA, 2004–2006.
Homogenous diets were dominated by one particular food type, whereas mixed diets were composed of 2 or more principal food types. Within these categories, diets are ordered by number of bear-days observed.
| Mean percent of daily digestible energy by food type | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Category | Daily diet type | No. bear-days | Mean no. samples/daya | AGVEGb | BGVEGc | Cambium | Fruit | Nut | Insect | Vertebrate |
| Homogeneous | Insect | 45 | 3.9 | 4 | 0 | 0 | 13 | 0 | 82 | 1 |
| AGVEG | 40 | 4.7 | 86 | 0 | 0 | 0 | 0 | 13 | 1 | |
| Fruit | 30 | 4.4 | 4 | 1 | 0 | 78 | 1 | 16 | 0 | |
| Vertebrate | 26 | 5.5 | 8 | 0 | 0 | 2 | 0 | 5 | 85 | |
| Nut | 12 | 6.0 | 2 | 0 | 0 | 1 | 91 | 5 | 1 | |
| BGVEG | 7 | 5.2 | 10 | 79 | 0 | 2 | 1 | 5 | 3 | |
| Mixed | Insect-AGVEG | 35 | 3.6 | 33 | 0 | 0 | 5 | 0 | 60 | 1 |
| Fruit-insect | 20 | 5.7 | 8 | 1 | 0 | 43 | 1 | 40 | 8 | |
| AGVEG-vertebrate | 18 | 5.5 | 53 | 0 | 0 | 0 | 1 | 13 | 32 | |
| Insect-vertebrate | 10 | 3.4 | 8 | 0 | 0 | 2 | 0 | 59 | 31 | |
| BGVEG mixed | 9 | 4.6 | 10 | 47 | 0 | 6 | 0 | 14 | 22 | |
| AGVEG-fruit | 8 | 3.8 | 41 | 0 | 0 | 51 | 0 | 5 | 3 | |
| Cambium mixed | 7 | 2.8 | 54 | 0 | 10 | 0 | 0 | 27 | 9 | |
| Nut mixed | 7 | 5.2 | 5 | 3 | 0 | 14 | 59 | 5 | 14 | |
a Sum of scat percent volumes and scat equivalent percentages assigned to foods identified by feeding sign
b Above-ground vegetation
c Below-ground vegetation