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Evolution of mutualism through spatial effects.

Norio Yamamura1, Masahiko Higashi, Narayan Behera

  • 1Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan. yamamura@ecology.kyoto-u.ac.jp

Journal of Theoretical Biology
|February 5, 2004
PubMed
Summary
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Spatial structure is crucial for the evolution of mutualism. Limited offspring dispersal allows mutualists to invade and stabilize populations, especially when costs are low and reproduction rates are moderate.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Biology

Background:

  • Mutualism, a ubiquitous interaction benefiting multiple species, lacks a clear evolutionary framework.
  • Understanding the conditions favoring the evolution of mutualism is essential for ecological theory.

Purpose of the Study:

  • To investigate the role of spatial structure in the evolution of mutualism.
  • To determine the conditions under which mutualistic species can invade and persist.

Main Methods:

  • A simple lattice model was developed to simulate species interactions.
  • Reproductive rates were modified based on interspecies interactions.
  • Offspring dispersal was analyzed under unlimited and limited (neighboring sites) conditions.

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Main Results:

  • Mutualism evolution was impossible with unlimited dispersal.
  • Limited dispersal enabled mutualist invasion when cost-to-benefit ratios were low and intrinsic reproduction rates were low (symmetric parameters).
  • Mutualistic populations proved evolutionarily stable against non-mutualist invasion under limited dispersal.

Conclusions:

  • Spatial structure, specifically limited dispersal, is a key factor promoting the evolution of mutualism.
  • The model identifies specific ecological parameters (cost, benefit, reproduction rate) favoring mutualism under spatial constraints.
  • Limited dispersal facilitates the rapid increase of mutualistic pairs, driving invasion success.