Table 2.
Torpor metabolic rates (TMR), resting metabolic rates (RMR, maximum torpor duration) and Ts in desert hamsters fasted overnight at Ta of 22°C.
| Animal No. | Age (days) | Body mass (g) | RMR (mlO2 g-1h-1) | TMR (mlO2 g-1h-1) | Torpor duration (min) | Lowest Ts (°C) after fasting | Ts (°C) before fasting |
|---|---|---|---|---|---|---|---|
| Pr2 #1 | 16 | 6.0-5.5 | 5.43 | 1.14 | 255 | 25.0 | 34.0 |
| Pr1 #1 | 16 | 6.1-5.2 | 24.6 | 34.4 | |||
| Pr1 #2 | 16 | 6.4-5.4 | 25.8 | 34.8 | |||
| Pr5 #1 | 17 | 7.5-6.1 | 5.64 | 2.28 | 83 | 28.6 | 34.2 |
| Pr5 #2 | 17 | 7.2-5.6 | 30.6 | 34.4 | |||
| Pr5 #3 | 17 | 6.9-5.5 | 29.0 | 34.8 | |||
| Pr3 #1 | 20 | 7.3-6.5 | 6.58 | 1.64 | 148 | 24.0 | 33.7 |
| Pr4 #1 | 20 | 6.3-5.3 | 29.6 | 34.8 | |||
| Pr4 #2 | 20 | 6.6-5.5 | 22.0 | 34.2 | |||
| Pr3 #2 | 21 | 6.9-5.5 | 6.08 | 2.00 | 136 | 23.4 | 34.8 |
| Pr4 #3 | 21 | 7.6-6.2 | 31.6 | 35.7 | |||
| Pr4 #4 | 21 | 7.8-6.3 | 32.6 | 35.8 | |||
| Pr2 #2 | 23 | 8.6-7.3 | 5.32 | 1.45 | 47 | 32.6 | 34.0 |
| Pr1 #3 | 23 | 7.2-5.5 | 33.8 | 34.4 | |||
| Pr1 #4 | 23 | 8.0-6.7 | 34.0 | 34.8 | |||
| Pr3 #3 | 24 | 8.5-7.5 | 5.24 | 1.89 | 46 | 29.6 | 33.8 |
| Pr3 #4 | 24 | 10.1-8.1 | 29.2 | 35.4 | |||
| Pr4 #5 | 24 | 8.9-7.0 | 32.4 | 33.8 | |||
| Pr2 #3 | 27 | 10.1-8.1 | 5.53 | 2.58 | 15 | 32.4 | 34.4 |
| Pr2 #4 | 27 | 10.2-8.0 | 33.2 | 35.8 | |||
| Pr1 #5 | 27 | 10.0-8.0 | 32.0 | 35.6 | |||
| Pr4 #1 | 33 | 11.0-9.2 | 6.07 | 3.12 | 10 | 32.6 | 34.4 |
| Pr1 #2 | 39 | 12.5-10.6 | 6.02 | 2.48 | 18 | 32.4 | 34.0 |
| Pr4 #2 | 40 | 12.5-10.5 | 5.33 | 2.66 | 23 | 33.6 | 34.4 |
| Pr1 #5 | 44 | 13.4-12.0 | 4.75 | 2.65 | 12 | 33.0 | 34.4 |
| Pr2 #1 | 45 | 12.7-10.9 | 4.99 | 3.14 | 10 | 32.6 | 34.2 |
All individuals could rewarm from low Tb via endogenous heat production. Two values of body mass for each individual are shown before and after measurements.