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Theory for the evolution of diffusible external goods.

William W Driscoll1, John W Pepper

  • 1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA. wwdrisco@email.arizona.edu

Evolution; International Journal of Organic Evolution
|April 17, 2010
PubMed
Summary

Populations producing beneficial external goods are stabilized by factors like diffusion rates and relatedness. An expanded Hamilton's rule explains how these traits evolve, considering both cooperative and selfish strategies.

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Area of Science:

  • Evolutionary Biology
  • Biophysics

Background:

  • Organisms invest in costly, diffusible external products benefiting multiple individuals.
  • Non-producers can exploit these benefits without incurring costs, posing an evolutionary challenge.

Purpose of the Study:

  • To determine conditions stabilizing populations producing diffusible external goods.
  • To expand existing evolutionary frameworks to include external goods production.

Main Methods:

  • Developed an expression for favorable conditions using principles of diffusion physics.
  • Expanded Hamilton's rule to incorporate variables relevant to external goods.

Main Results:

  • Identified key variables: diffusion coefficient, individual distance, and uptake rate.
  • Showed that relatedness and cost/benefit ratio are crucial, alongside diffusion dynamics.
  • Presented an expanded Hamilton's rule encompassing selfish and altruistic pathways.

Conclusions:

  • The framework explains the evolution of external goods production beyond traditional altruism.
  • Applicable to diverse external goods traits, offering a heuristic for fitness consequence analysis.