A comparison of foraging strategies in a patchy environment

Area of Science:

• Ecology
• Behavioral Ecology
• Evolutionary Biology

Background:

• Predators in patchy environments utilize diverse foraging strategies.
• Strategies vary in predator aggregation levels in response to prey density.
• Evolutionarily stable strategies (ESS) provide a framework for comparing strategy success.

Purpose of the Study:

• To compare predator foraging strategies based on aggregation behavior.
• To determine conditions under which different strategies are evolutionarily stable.
• To investigate the role of prey density and patch emptiness in strategy dynamics.

Main Methods:

• Modeling predator foraging in a patchy environment.
• Using net energy uptake as a proxy for reproductive fitness.
• Simulating invasion scenarios of one strategy into a population using another.

Main Results:

• In prey-sustaining patches, strategy success (higher net energy uptake) depends on resident population density and resulting prey levels.
• Aggregative strategies are favored when prey densities remain high.
• Less aggregative strategies are favored when prey densities are depleted.
• When patches can be empty of prey, aggregative and non-aggregative strategies may coexist.

Conclusions:

• Foraging strategy success is context-dependent, influenced by prey availability and predator density.
• The potential for empty patches is a critical factor enabling the coexistence of different predator aggregation strategies.
• Understanding these dynamics is key to predicting predator-prey interactions in heterogeneous landscapes.