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State-dependent foraging rules for social animals in selfish herds
Sean A Rands1, Richard A Pettifor, J Marcus Rowcliffe
1Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK. s.rands@zoo.com.ac.uk
Proceedings. Biological Sciences
|December 24, 2004
Summary
Animals use simple rules to form groups for safety and foraging. Their decisions depend on energy levels and neighbors, influencing group size and individual success.
Area of Science:
- Behavioral Ecology
- Theoretical Ecology
- Computational Biology
Background:
- Animals benefit from group living, including predator dilution effects (selfish herd).
- Game theory predicts group properties, but proximate mechanisms remain unclear.
Purpose of the Study:
- To explore proximate mechanisms driving group formation and properties.
- To model how individual decisions influence group dynamics and outcomes.
Main Methods:
- Utilized a spatially explicit, individual-based model.
- Simulated individual decision-making based on energetic reserves and neighbor presence/actions.
- Incorporated environmental factors like foraging site distribution and detectability.
Main Results:
- Individual behavior, energetic reserves, and group sizes are influenced by conspecific detection and resource distribution.
- The ability to balance foraging site selection with neighbor proximity significantly impacts individuals and group sizes.
- The proposed rule-of-thumb demonstrates emergent group properties.
Conclusions:
- Individual-level rules-of-thumb, considering energy and social cues, can explain group living phenomena.
- Environmental factors and individual decision-making flexibility are crucial for understanding animal group dynamics.
- This model provides a framework for investigating the proximate basis of collective behavior.