Insect exoskeletons react to hypergravity

Area of Science:

• Biomaterials Science
• Evolutionary Biology
• Biomechanics

Background:

• Biological materials commonly exhibit adaptation to mechanical loads.
• The adaptive capacity of insect cuticle exoskeletons under mechanical stress has not been previously established.

Purpose of the Study:

• To investigate the effects of prolonged hypergravity exposure on insect exoskeleton morphology and biomechanics.
• To determine if insect cuticles exhibit adaptive responses to altered gravitational conditions.

Main Methods:

• Locusts were subjected to various hypergravity levels using a custom-designed centrifuge for several weeks.
• Biomechanical testing and X-ray microtomography were employed to assess changes in the exoskeleton.

Main Results:

• Exposure to hypergravity up to 3g resulted in a significant increase (approx. 67%) in the Young's modulus of locust tibiae.
• Higher gravitational loads negatively impacted locust survival rates, body mass, and endocuticle thickness.

Conclusions:

• Insect cuticle exoskeletons demonstrate a capacity to adapt to hypergravity conditions.
• This finding expands the known range of adaptive biological materials beyond bone and plant tissues.
• The study provides insights into the evolutionary factors driving the development of skeletal systems.