N_{visitors} | ||||||||
---|---|---|---|---|---|---|---|---|
Cell | Total time | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
a | 100% | 0% | 21.9% | 51.3% | 25.6% | 1.3% | 0% | — |
35.1±0.3°C | — | 34.9±0.2°C | 35.0±0.2°C | 35.4±0.2°C | 35.4±0.0°C | — | — | |
b | 100% | 0% | 12.0% | 34.3% | 35.7% | 15.0% | 3.1% | 0% |
35.0±0.5°C | — | 34.2±0.2°C | 34.8±0.3°C | 35.3±0.3°C | 35.7±0.1°C | 35.8±0.1°C | — | |
c | 100% | 3.6% | 20.8% | 39.4% | 22.2% | 6.4% | 7.5% | 0% |
34.2±0.4°C | 33.9±0.1°C | 34.0±0.3°C | 34.2±0.4°C | 34.2±0.3°C | 34.2±0.3°C | 34.5±0.4°C | — | |
d | 100% | 14.7% | 13.3% | 46.8% | 21.4% | 3.7% | — | — |
34.2±0.4°C | 33.8±0.2°C | 33.9±0.4°C | 34.2±0.4°C | 34.4±0.3°C | 35.0±0.2°C | — | — | |
e | 100% | 5.2% | 24.4% | 55.6% | 13.4% | 1.4% | 0% | 0% |
33.6±0.6°C | 32.9±0.1°C | 33.3±0.3°C | 33.7±0.5°C | 34.3±0.3°C | 34.9±0.0°C | — | — |
The number of empty cells adjacent to a certain sealed brood cell was 6 for cells b, c and e. Cells a and d were surrounded by 5 or 4 empty cells and 1 or 2 non-visitable sealed brood cells, respectively. The % values are the times during which a certain number of cell visitors were present (% of the total observation time of 180 min). Brood cell temperatures (mean ± S.D.) are given separately for elongated periods (>1.5 min) with a constant number of N_{visitors} and for the total observation time, irrespective of N_{visitors}. The increase of brood temperature with the number of cell visitors was significant (Jonckheere's trend test, P<0.001 for each of the five brood cells). Sample sizes of the classified temperatures (0—6) are N=506, 447 and 448 (cells a, b and c) and N=7672 and 8686 values (cells d and e; see text for the sampling rates), respectively. T_{hive}=32.3±0.6°C (air temperature in the brood nest); T_{room}=26.0±0.7°C.