Balancing Biomechanical Constraints: Optimal Escape Speeds When There Is a Trade-off between Speed and...

Area of Science:

• Biomechanics
• Animal behavior
• Evolutionary biology

Background:

• Prey escape success depends on speed and maneuverability.
• A biomechanical trade-off exists between speed and maneuverability, limiting simultaneous maximization.
• Animals may not use maximal speeds for escape to optimize survival probability.

Purpose of the Study:

• To investigate how the shape of the speed-maneuverability trade-off affects optimal escape speed.
• To determine the impact of trade-off variation on prey escape performance and survival.
• To analyze predator learning responses to prey locomotion strategies.

Main Methods:

• Utilized tablet-based games simulating predator-prey interactions with human subjects as predators.
• Defined specific speed-maneuverability trade-off functions to test prey behavioral choices.
• Assessed prey survival based on the ability to escape simulated predators across different trade-off scenarios.

Main Results:

• The shape of the speed-maneuverability trade-off significantly influenced optimal escape speed and performance breadth.
• Non-linear trade-offs led to varied optimal escape speeds; lower optimal speeds were observed when maneuverability was compromised only at high speeds.
• Predators improved at catching faster prey with experience, but showed no improvement in capturing more maneuverable prey.

Conclusions:

• High-speed locomotion incurs costs on maneuverability, making maximal speeds suboptimal for predator evasion.
• The specific form of the speed-maneuverability trade-off dictates prey's optimal escape strategy.
• Understanding these trade-offs is crucial for explaining animal movement choices in predator-prey dynamics.