TABLE 2.
Phenotyping of the torpor incidence groups according to the adaptation parameters of approach 1.
| Adaptation parameters | Given values | Torpor incidence group | ANOVA | Post hoc test with p = 0.050 | ||||
| Never torpor (n = 14) | Rarely torpor (n = 12) | Sometimes torpor (n = 22) | Often torpor (n = 12) | Test statistics | p-value | Comparison | ||
| Fur index in SP07 | Median | 1.8 | 1.5 | 2.0 | 1.3 | H(3) = 3.6 | 0.310 | – |
| Fur index in SP12 | Median | 3.3 | 3.0 | 3.3 | 3.3 | H(3) = 0.0 | 0.998 | – |
| Body mass in SP00 (g) | Mean | 35.0 | 35.9 | 37.2 | 35.3 | F(56,3) = 0.6 | 0.615 | – |
| Body mass in SP07 (g) | Mean | 30.5 | 28.9 | 30.4 | 28.4 | F(56,3) = 0.8 | 0.475 | – |
| Body mass in SP12 (g) | Mean | 29.9 | 27.3 | 28.2 | 25.5 | F(56,3) = 3.1 | 0.035 | Never vs. often |
| Body mass change in SP07 (%) | Mean | –8.7 | –19.3 | –17.4 | –19.2 | F(56,3) = 5.0 | 0.004 | Never vs. rarely |
| Never vs. sometimes | ||||||||
| Never vs. often | ||||||||
| Body mass change in SP12 (%) | Mean | –10.7 | –23.5 | –23.3 | –27.4 | F(56,3) = 12.5 | < 0.001 | Never vs. rarely |
| Never vs. sometimes | ||||||||
| Never vs. often | ||||||||
Fur index, scored from 1 for a light brown summer fur to 6 for a dense white winter fur (Figala et al., 1973), and absolute body mass were assessed weekly over the course of adaptation to the short photoperiod. The relative body mass change was calculated in relation to SP00. Three weeks of interest were chosen, namely, SP00: start of adaptation; SP07: before torpor expression; and SP12: after first torpor bouts had been observed. More details on the statistical tests are listed in Supplementary Table 2.