Individual lifetime pollen and nectar foraging preferences in bumble bees

Area of Science:

• Behavioral Ecology
• Insect Social Behavior

Background:

• Foraging specialization is key to labor allocation in social insects.
• Limited knowledge exists on individual bumble bee specialization (nectar vs. pollen), preference timing, and adaptability.

Purpose of the Study:

• To investigate individual bumble bee foraging specialization and its stability over a lifetime.
• To determine when foraging preferences manifest and if they can be altered in response to colony demands.

Main Methods:

• Monitoring all foraging visits of individual bumble bees (Bombus impatiens) in multiple colonies.
• Classifying foragers into nectar specialists, pollen specialists, and generalists based on visit data.
• Analyzing the impact of initial foraging choices and the removal of specialists on colony dynamics.

Main Results:

• Individual bumble bees exhibit consistent lifetime foraging preferences, established on their first day of foraging.
• 16-36% of foragers specialized on either nectar or pollen.
• Generalist foragers demonstrated an ability to adjust their specialization in response to the removal of pollen specialists.

Conclusions:

• Bumble bee foraging preferences are largely fixed early in life.
• Despite established preferences, generalist bumble bees can adapt their foraging behavior to support colony needs, particularly when specialists are absent.