Game theory models of functional and aggregative responses

Area of Science:

• Ecology
• Behavioral Ecology
• Population Dynamics

Background:

• The ideal free distribution (IFD) predicts constant intake across sites and aggregation in high-density areas under low interference.
• Individual variation in competitive ability is a key factor often overlooked in basic IFD models.

Purpose of the Study:

• To investigate how individual differences in competitive ability affect foraging strategies and distribution patterns.
• To compare predictions of the IFD with outcomes incorporating heterogeneity in competitive strength.

Main Methods:

• Theoretical modeling of foraging behavior under varying prey densities.
• Simulation of aggregative and functional responses with and without individual competitive differences.

Main Results:

• Incorporating individual competitive differences modifies the functional response, leading to increased intake with prey density.
• The aggregative response shifts from clustering to a more even distribution of individuals across sites.

Conclusions:

• Individual variation in competitive ability significantly alters predictions of the ideal free distribution.
• Heterogeneity in competitive strength promotes more uniform resource exploitation, challenging traditional IFD assumptions.