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Scale-free foraging by primates emerges from their interaction with a complex environment.
Denis Boyer1, Gabriel Ramos-Fernández, Octavio Miramontes
1Departamento de Sistemas Complejos, Instituto de Física, Universidad Nacional Autónoma de México, México DF.
Proceedings. Biological Sciences
|June 23, 2006
Summary
Animal foraging patterns, like Lévy walks, can arise from how animals interact with their environment, not just optimal search strategies. This study models primate foraging influenced by tree distribution, revealing scale-free movements.
Area of Science:
- Ecology
- Animal Behavior
- Theoretical Biology
Background:
- Scale-free foraging patterns are common in animals, potentially linked to optimal search strategies or resource distribution.
- The influence of resource distribution on animal movement patterns remains less explored.
Purpose of the Study:
- To investigate if resource distribution, specifically heterogeneous tree sizes, can induce scale-free foraging patterns.
- To model primate foraging behavior based on efficiency criteria and mental maps in disordered environments.
Main Methods:
- Developed a simple foraging model for individual primates.
- Incorporated a maximum efficiency criterion for displacement choices.
- Simulated foraging in a spatially disordered environment with heterogeneous tree sizes.
Main Results:
- A specific tree-size frequency distribution was shown to induce non-Gaussian movement patterns.
- These patterns exhibit multiple spatial scales, consistent with Lévy walks.
- Model results align with field observations of spider monkey foraging and tree-size variation.
Conclusions:
- Resource distribution can be a significant driver of scale-free foraging patterns.
- The findings suggest a mechanism for Lévy walk emergence in animal movement.
- Implications for seed dispersal patterns by foraging primates are discussed.