Insect behaviour: arboreal ants build traps to capture prey

Area of Science:

• Ecology
• Ethology
• Myrmecology

Background:

• Arboreal ants require nitrogen, often obtained through predation.
• Limited foraging environments necessitate specialized hunting strategies.
• Group ambush tactics are employed by some ants to capture elusive prey.

Purpose of the Study:

• To investigate the novel predatory behavior of the arboreal ant Allomerus decemarticulatus.
• To document the construction and function of a unique ant-constructed trap.
• To determine if this collective trap-building strategy is a previously undescribed predatory tactic in ants.

Main Methods:

• Observation of Allomerus decemarticulatus in its natural habitat.
• Analysis of the materials used in trap construction (plant hair, fungal mycelium).
• Documentation of the prey capture and processing sequence.

Main Results:

• Allomerus decemarticulatus constructs a "galleried" platform trap using host plant stem hair and fungal mycelium.
• Ants beneath the platform immobilize prey through the trap's holes.
• Prey is subsequently transported and consumed by a larger group of nestmates.

Conclusions:

• The collective creation of a trap represents a novel predatory strategy in ants.
• This behavior allows Allomerus decemarticulatus to capture significantly larger prey than individual ants could manage.
• This study highlights the complex and innovative foraging adaptations within arboreal ant species.