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Published on: March 13, 2014
Body condition dependent dispersal in a heterogeneous environment
Mats Gyllenberg1, Éva Kisdi, Margarete Utz
1Department of Mathematics and Statistics, University of Helsinki, FIN-00014 Helsinki, Finland. mats.gyllenberg@helsinki.fi
Theoretical Population Biology
|March 24, 2011
Summary
This study reveals that evolutionarily stable dispersal strategies in heterogeneous environments depend on patch safety and productivity. Family kin competition drives dispersal, with better dispersers leaving less suitable patches.
Area of Science:
- Ecology
- Evolutionary Biology
- Behavioral Ecology
Background:
- Organisms inhabit environments with varying patch safety and productivity.
- Offspring body condition influences dispersal and competitive ability.
- Kin competition and patch quality drive dispersal decisions.
Purpose of the Study:
- To determine evolutionarily stable dispersal behavior in heterogeneous environments.
- To investigate the role of kin competition and body condition in dispersal.
- To explain empirical observations of body condition-dispersal relationships.
Main Methods:
- Modeling evolutionarily stable strategies (ESS) for dispersal.
- Analyzing dispersal driven by kin competition in a weighted lottery system.
- Considering patch safety, productivity, and offspring body condition.
Main Results:
- ESS predicts abandoning unsafe or unproductive patches.
- Within families, better dispersers leave, while poorer dispersers stay.
- Population-level body condition distributions may not reflect within-family patterns.
- Equivalence classes of selectively neutral dispersal strategies exist when dispersal ability is uniform.
Conclusions:
- Dispersal strategies are shaped by environmental heterogeneity and kin competition.
- Observed variation in body condition-dispersal relationships can be evolutionarily stable.
- The model reconciles theoretical predictions with empirical data limitations.
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