Prey-Foraging Patterns in a Complex Landscape of Fear

Area of Science:

• Ecology
• Behavioral Ecology
• Aquatic Food Webs

Background:

• Antipredator defenses can be modulated by predator state (cannibalism, stress).
• The impact of predator state on prey defense and trophic cascades is system-specific.
• Understanding these interactions is crucial for predicting food web dynamics.

Purpose of the Study:

• To investigate if chemical cues of higher-order predator cannibalism or stress suppress mesopredator defenses.
• To determine the consequences of altered mesopredator behavior on their prey.
• To assess the system-specificity of predator state effects on prey antipredator responses.

Main Methods:

• Utilized an aquatic food chain model (higher-order predator, mesopredator, mesopredator's prey).
• Exposed mesopredators to chemical cues signaling higher-order predator cannibalism and stress.
• Analyzed mesopredator defensive behaviors and hunting patterns using network-based behavioral analysis.

Main Results:

• Mesopredator defensive responses were not suppressed by predator cues.
• Instead, mesopredator defenses increased in a cue-specific manner.
• Distinct hunting patterns emerged, leading to varied consequences for the mesopredator's prey.

Conclusions:

• Defense suppression is not universal and is highly system-specific.
• Predator state can induce complex, rather than simplified, behavioral shifts in mesopredators.
• Network-based behavioral analysis is valuable for detecting subtle changes in predator-prey interactions and trophic cascades.