Table 1.

Thorax temperatures (Tth) of bees visiting empty cells adjacent to sealed brood cells (type 1) or non-brood cells (type 2)

Type 1 (adjacent to brood cells)
Comb B Comb C Day
35.7±3.1 (6, 28)35.8±2.4 (13, 71)1
34.8±2.9 (6, 54)34.8±2.7 (13, 80)2
Tth (°C) (N, n) 34.7±3.3 (6, 53) 35.6±2.6 (13, 95) 3
Type 2 (adjacent to non-brood cells)Comb A32.4±2.5 (19, 130)P<0.01P<0.011
30.4±1.7 (23, 179)P<0.01P<0.012
28.5±0.9 (23, 194)P<0.01P<0.013
Comb B33.3±1.7 (27, 167)P<0.01P<0.011
33.4±2.3 (35, 261)P<0.01P<0.012
31.1±1.9 (35, 295)P<0.01P<0.013
Comb C32.5±1.0 (19, 31)P<0.01P<0.011
34.0±2.1 (27, 139)n.s.P<0.052
32.5±1.7 (27, 176)P<0.01P<0.013
  • Data from three observation periods performed on three consecutive days (setup B). Comb A contained no brood and only the side facing the hive centre (Fig. 1) was analysed. Values of Tth are means ± S.D. (N, n). N, number of cells observed; n, number of measurements (Tth of bees inside cells) obtained from 20 infrared images during a 100 min period. Troom was 23.0±0.3°C, 22.5±0.4°C and 21.0±0.3°C on the days 1, 2, and 3, respectively, and Thive in the colony's centre was maintained at 34.2±0.3°C, 35.0±0.3°C and 34.4±0.4°C, respectively. P, result of Kolmogoroff-Smirnoff test; n.s., not significant (P>0.05).