Conflict over caste fate in insect societies

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Social Insects

Background:

• Social inequality is a prevalent driver of conflict across the animal kingdom.
• In eusocial insects (ants, bees, wasps, termites), disparities in reproductive potential between castes trigger developmental conflicts over caste fate.

Purpose of the Study:

• To provide a comprehensive review of caste fate conflict.
• To synthesize data from diverse taxa and recent theoretical advancements in understanding these conflicts.

Main Methods:

• Literature review of caste fate conflict across various animal taxa.
• Analysis of theoretical advances in evolutionary and behavioral biology.

Main Results:

• Caste fate is often socially controlled via differential feeding, aligning larval development with colony needs.
• Individual self-determination mechanisms can disrupt this balance, leading to overproduction of reproductives and reduced colony fitness.
• Pronounced caste conflicts occur in stingless bees and lower termites, where larvae can override social control.

Conclusions:

• Caste fate conflict highlights the tension between individual and collective interests in biological systems.
• The resolution of these conflicts significantly impacts the organization and functioning of higher biological levels.
• Understanding caste conflict provides insights into the evolution of sociality and cooperation.