Evolution of prudent predation in complex food webs.

Area of Science:

• Ecology
• Evolutionary Biology
• Theoretical Ecology

Background:

• The concept of prudent predation, where predators conserve prey populations, was dismissed based on outdated evolutionary theories.
• Previous models of two-species predator-prey systems showed prudent predation but predicted unrealistic population fluctuations.

Purpose of the Study:

• To investigate the evolution of prudent predation in complex food web models.
• To explain the absence of predicted population fluctuations in real-world ecosystems.
• To identify empirical signatures and applications of evolved prudent predation.

Main Methods:

• Utilized complex model food webs to simulate predator-prey dynamics.
• Analyzed consumer-mediated (apparent) competitive exclusion of resources.
• Developed testable predictions for empirical validation.

Main Results:

• Prudent predation evolves in complex food webs via apparent competition, not leading to population instability.
• This mechanism explains declines in invasive species, fish stock-recruitment patterns, and pelagic consumer clearance rates across diverse ecosystems and body masses.

Conclusions:

• Evolved prudent predation is a significant factor in ecological dynamics beyond simple predator-prey coexistence.
• The findings offer a unified explanation for various ecological phenomena, supported by empirical evidence across ecosystems.