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Nearly Optimal Foraging in Patches Under Nutrient Constraints
The Biological Bulletin
|June 3, 2017
Summary
No single feeding strategy is best for predators needing multiple nutrients. Computer simulations show different prey selection rules have similar overall costs, suggesting flexibility in foraging behavior.
Area of Science:
- Behavioral Ecology
- Computational Biology
- Foraging Theory
Background:
- Predators must balance nutrient intake with the costs of searching, consuming prey, and moving between patches.
- Prey availability and distribution (random or aggregated) influence foraging efficiency.
- Predator emigration is triggered by insufficient nutrient acquisition within a set number of encounters.
Purpose of the Study:
- To evaluate three distinct prey selectivity strategies for predators.
- To determine the overall cost-effectiveness of different foraging rules under varying conditions.
- To identify if any single strategy offers a consistent advantage in nutrient acquisition.
Main Methods:
- Monte Carlo computer simulations were employed to model predator-prey interactions.
- Three feeding strategies were simulated: no discrimination, minimal consumption, and a hybrid nutrient-monitoring approach.
- Key variables included nutrient requirements, prey composition and abundance, prey distribution, and emigration thresholds.
Main Results:
- Each simulated feeding strategy exhibited unique dynamics and optimal parameters.
- No single strategy consistently outperformed the others across all simulated scenarios.
- Differences in overall foraging costs between strategies were minimal over a large parameter space.
Conclusions:
- Predator foraging strategies are context-dependent, with no universal best approach.
- The choice between different prey selectivity rules may have limited impact on overall foraging success.
- Predator behavior can be flexible, adapting to nutrient needs and environmental conditions without significant cost penalties.
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