Bumble bee queen pheromones are context-dependent.

Area of Science:

• Chemical Ecology
• Behavioral Ecology
• Social Insect Biology

Background:

• Queen pheromones are critical for regulating reproductive division of labor in social insects.
• Previous studies identified limited queen pheromones and examined their effects in isolation from social context.

Purpose of the Study:

• To investigate the role of behavioral and social context in bumble bee workers' perception of queen semiochemicals.
• To determine if isolated queen cues can inhibit worker reproduction.

Main Methods:

• Examined the impact of queen's cuticular semiochemicals, visual presence, and offspring on worker reproduction.
• Assessed the inhibitory effects of individual cues versus cues presented in a realistic social context.

Main Results:

• Queen's cuticular semiochemicals inhibit worker reproduction only when presented with the queen's visual presence and offspring.
• No single element (queen chemistry, visual presence, or offspring) independently inhibited worker reproduction.
• Realistic social context is essential for the inhibitory function of queen semiochemicals.

Conclusions:

• The definition of a queen pheromone needs reevaluation.
• Future studies should incorporate social and behavioral contexts when investigating chemical ecology in social insects.