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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