Alarm-recruitment system

Definition

A coordinated communication mechanism in social insects and some other arthropods whereby individuals detecting a threat emit signals that simultaneously alert nestmates and mobilize them toward the source of disturbance for collective defense, repair, or resource protection. The system integrates alarm pheromones, mechanical vibrations, or contact signals with recruitment cues that guide responders spatially, distinguishing it from pure alarm (which only alerts) or pure recruitment (which only attracts to a resource).

Etymology

Example

In the ant genus Pogonomyrmex, workers encountering an intruder near the nest entrance release alarm pheromones from mandibular glands; nestmates detecting these chemicals emerge and orient toward the disturbance, forming a defensive phalanx that repels vertebrate predators.

Synonyms

• alarm-recruitment communication
• alarm-recruitment signaling

Related Terms

• alarm pheromone
• recruitment pheromone
• defensive behavior
• social insect communication
• trail pheromone
• Tandem running
• mass recruitment

Usage Notes

The term specifically denotes the functional coupling of alerting and spatial mobilization; some authors reserve it for contexts where the same signal or tightly linked signals accomplish both tasks. Contrast with "alarm-defense system" (alerting without spatial recruitment) and "foraging recruitment" (mobilization toward food rather than threat). Usage varies in stingless bees and termites, where substrate-borne vibrations may replace or supplement chemical components.