Fig. 8. Interior temperatures of three different brood cells (T_brood) in an observation hive (setup D), measured simultaneously at the bottom of each cell. All cells were in the same region of the brood nest, 2–3 intermittent cells away from each other, and were adjacent to 4–6 empty cells. Note that cooling and warming may occur simultaneously in different cells. An open circle on the temperature curve marks the time when a bee with a thorax temperature (T_th) of 36°C entered an empty cell adjacent to this brood cell for a long-duration cell visit (2 min). See Results (setup D) and Discussion for cell visits that are not followed by a temperature change within 2 min and for temperature changes that are not preceded by such a cell visit. Temperatures of cells d and e were stored every second with a resolution of 0.01°C. The T_brood of cell a was read from video every 15 s with a resolution of 0.1°C (consecutive values are connected by a line for better visualisation of the curve). The asterisk marks a gap of 11 min in the data record of cell a.

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