RESULTS AND DISCUSSION The total number of bees entering the colonies during the daily 24-min sampling intervals, as well as the number of these bees carrying pollen, are shown in Figs. 3 and 4, respectively. Both flight and pollen foraging activity appear to be closely correlated throughout the 28-day exposure period. The slight difference between microwave and sham colony foraging activity near the end of the study could be associated with an increased adult population in the microwave colony or a greater amount of uncapped brood that may stimulate foraging by more bees. There is no indication of microwave-induced effects in the treated colony. The brood nest temperature of a honey bee colony is essentially independent of ambient temperature and is maintained at 34 ± 2 °C. If ambient temperature levels are lower, bees produce heat by increased metabolic activity. If warmer, they cool the nest by distributing collected water within the nest and fanning, which causes evaporative cooling. Daily maximum and minimum temperatures within the brood
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