Timing of production of winter bees in honey bee (Apis mellifera) colonies

Summary.

Little is known about the development of the overwintering population of honey bees (Apis mellifera) colonies in temperate climates. Colonies were subjected to one of four requeening treatments: requeened in mid-summer with a mated, virgin or colony-reared queen, or left with the original queen (control). Worker survival in cohorts of newly emerged bees introduced to colonies in late summer and fall was followed until all marked bees had died. Winter bees were reared over a relatively similar length of time in all treatments, but they appeared earlier in control colonies compared to requeened colonies. The gradual increase in proportion of winter bees over time was similar among treatments, but requeened colonies lagged behind control colonies. The bulk of winter bees appeared much earlier in control colonies than in colonies that were requeened. This response demonstrates that cues within the colony (i.e., differences due to requeening) are perceived by workers as part of the conditions that influence summer bee or winter bee status.