Skip to main content

Table 1 Characteristics of activity rhythms in bears during winter dormancy

From: The bear circadian clock doesn’t ‘sleep’ during winter dormancy

  CAPTIVE  
  DD All [12] DD Juvenile [5] DD Adult [7] Ambient [6] Wild [10]
Average Activity (Counts/min) 196 ± 5 293 ± 73a 90 ± 20b 34 ± 19b 74 ± 3b
Period (h) 23.97 ± 0.11 23.75 ± 0.10a,† 24.19 ± 0.08b,† 23.99 ± 0.07c 24.03 ± 0.02b,c
Acrophase (h) 15.74 ± 1.39 14.58 ± 2.02 17.29 ± 1.81 12.53 ± 0.74 13.71 ± 0.41
Strength (%) 9 ± 1 10 ± 2a 7 ± 1a,c 17 ± 3 a,b 6 ± 1a,c
Variability (h) 1.07 ± 0.1 1.06 ± 0.13a 1.09 ± 0.16a,b 1.2 ± 0.09a,b,c 1.79 ± 0.12d
Amplitude (Counts/min) 272 ± 104 425 ± 13a 94 ± 13b 45 ± 9 b 78 ± 5b
  1. a,b,c,dDifferent letters within a row are significantly different from each other, p ≤ 0.05
  2. Significantly different from 24 h (one sample t-test, p < 0.05)
  3. Numbers of animals are indicated in brackets
  4. Values are means ± SEM