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Black Soldier Fly Larvae Rearrange under Compression
Olga Shishkov1, Joshua Trebuchon2, Peter J Yunker2
1School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
Integrative and Comparative Biology
|August 3, 2019
Summary
Black soldier fly larvae rapidly rearrange when compressed, reaching equilibrium 10 times faster than dead larvae. This active rearrangement has potential applications in the larvae-rearing industry.
Area of Science:
- Biophysics
- Insect biology
- Materials science
Background:
- Black soldier fly larvae (Hermetia illucens) are often densely packed in rearing systems.
- Understanding larval behavior under compression is crucial for optimizing rearing and processing.
Purpose of the Study:
- To investigate the mechanical response and rearrangement dynamics of black soldier fly larvae under compression.
- To compare the behavior of live versus dead larvae to elucidate the role of active processes.
Main Methods:
- Creep tests were performed using a universal testing machine to compress larvae to specific volume fractions.
- Reaction forces and their time course were measured for both live and dead larvae.
Main Results:
- Live larvae achieved mechanical equilibrium approximately 10 times faster than dead larvae.
- Larval relaxation could be modeled using stretched exponentials, similar to synthetic polymers.
- Equilibrium pressures were similar for live and dead larvae, suggesting physics-driven forces.
- Live larvae exhibited active fluctuations to maintain equilibrium pressure.
Conclusions:
- Larval rearrangement under compression is a rapid, active process significantly influenced by live behavior.
- The physical properties of the larvae, rather than solely their behavior, dictate equilibrium pressures.
- Findings suggest potential applications in the larvae-rearing industry for efficient packing and handling.
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