Insulin Modifies Honeybee Worker Behavior.

Area of Science:

• Behavioral Endocrinology
• Insect Physiology
• Social Insect Behavior

Background:

• The insulin signaling pathway is a key regulator of metabolism and development.
• This pathway is increasingly recognized for its role in modulating behavior across species.
• Its specific function in regulating social insect behavior, particularly in honeybees, remains an area of active investigation.

Purpose of the Study:

• To investigate the direct effects of insulin on worker honeybee behavior.
• To examine insulin's influence on sucrose response thresholds in winter bees.
• To assess insulin's impact on the transition to foraging in summer nurse bees.

Main Methods:

• Worker honeybees (winter and summer cohorts) were treated with bovine insulin as a proxy for honeybee insulin.
• Sucrose response thresholds were measured in winter bees post-insulin treatment.
• The age of foraging initiation was monitored in summer nurse bees following insulin administration.

Main Results:

• Insulin treatment significantly increased the sucrose response threshold in winter worker bees.
• Treatment with insulin markedly reduced the age at which summer nurse bees began foraging.
• These findings demonstrate a direct behavioral effect of insulin in honeybees.

Conclusions:

• Insulin signaling plays a crucial role in the regulation of worker honeybee behavior.
• Endocrine factors, such as insulin, are important mediators of behavioral plasticity in social insects.
• This study provides valuable insights into the neuroendocrine mechanisms underlying insect behavior.