Control of tumbling during the locust jump

Area of Science:

• Insect biomechanics
• Locomotion and motor control

Background:

• Locusts exhibit precise jumping but can also tumble mid-air.
• Understanding the mechanisms controlling locust jump trajectory is essential.

Purpose of the Study:

• To investigate two proposed mechanisms for locusts controlling tumbling during jumps.
• To correlate body pitch and muscle activity with jump trajectory and stability.

Main Methods:

• Observational analysis of locust take-off angles and body pitch.
• Computer simulations of locust jumping dynamics.
• Electromyography to assess muscle activation patterns.

Main Results:

• Locusts adjust take-off angle with initial body pitch, minimizing tumbling.
• Simulations confirm that a specific pitch-angle relationship reduces tumbling.
• Dorsolongitudinal muscle contractions generate counter-torques, controlling tumbling magnitude and direction.

Conclusions:

• Locusts utilize pre-jump body pitch adjustment and active muscle control to manage tumbling.
• These mechanisms enhance jump precision and may be vital for predator evasion.
• Tumbling control influences jump elevation, highlighting its importance in locust locomotion.