Geotropism of hornet comb construction under persistent acceleration

Area of Science:

• Zoology
• Animal Behavior
• Insect Physiology

Background:

• Social wasps (Vespinae) exhibit precise geotactical orientation in nest construction.
• Understanding insect navigation and environmental cue utilization is crucial for ecological studies.

Purpose of the Study:

• To investigate the effect of persistent acceleration on comb construction in Oriental hornets (Vespa orientalis).
• To determine the role of early-life experience and geometric cues in hornet nest orientation.

Main Methods:

• Experimental manipulation of gravitational and centrifugal forces on hornets in breeding boxes of varying shapes.
• Comparison of comb construction direction under altered forces versus normal gravity.
• Assessment of hornet age (juvenile vs. adult) and prior environmental exposure.

Main Results:

• Juvenile and adult hornets oriented comb construction with the resultant force vector, regardless of box shape (rectangular or spherical).
• Adult hornets previously exposed to stationary conditions attempted to build according to learned gravity, even when subjected to new forces.
• Hornets habituated to specific geometric cues, particularly the roof, built in alignment with the resultant force.

Conclusions:

• Hornets learn to perceive and orient to gravitational force direction within the first few days of life.
• Learned gravitational orientation persists and influences nest building even when exposed to altered forces.
• Geometric cues within the nest, especially the roof, are critical for habituated orientation to gravitational forces.