The Role of Space in the Exploitation of Resources

Research output: Contribution to journalArticle

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Abstract

In order to understand the role of space in ecological communities where each species produces a certain type of resource and has varying abilities to exploit the resources produced by its own species and by the other species, we carry out a comparative study of an interacting particle system and its mean-field approximation. For a wide range of parameter values, we show both analytically and numerically that the spatial model results in predictions that significantly differ from its nonspatial counterpart, indicating that the use of the mean-field approach to describe the evolution of communities in which individuals only interact locally is invalid. In two-species communities, the disagreements between the models appear either when both species compete by producing resources that are more beneficial for their own species or when both species cooperate by producing resources that are more beneficial for the other species. In particular, while both species coexist if and only if they cooperate in the mean-field approximation, the inclusion of space in the form of local interactions may prevent coexistence even in cooperative communities. Introducing additional species, cooperation is no longer the only mechanism that promotes coexistence. We prove that, in three-species communities, coexistence results either from a global cooperative behavior, or from rock-paper-scissors type interactions, or from a mixture of these dynamics, which excludes in particular all cases in which two species compete. Finally, and more importantly, we show numerically that the inclusion of space has antagonistic effects on coexistence depending on the mechanism involved, preventing coexistence in the presence of cooperation but promoting coexistence in the presence of rock-paper-scissors interactions. Although these results are partly proved analytically for both models, we also provide somewhat more explicit heuristic arguments to explain the reason why the models result in different predictions.

Original languageEnglish (US)
Pages (from-to)1-44
Number of pages44
JournalBulletin of Mathematical Biology
Volume74
Issue number1
DOIs
StatePublished - Jan 2012

Fingerprint

Introduced Species
Biota
Aptitude
Exploitation
Cooperative Behavior
Resources
resource
Coexistence
cooperatives
coexistence
rocks
Rocks
prediction
Ecosystems
Mean-field Approximation
Heuristics
Inclusion
cooperative behavior
Interacting Particle Systems
Local Interaction

Keywords

  • Cooperator
  • Defector
  • Interacting particle system
  • Mean-field approximation
  • Rock-paper-scissors interactions

ASJC Scopus subject areas

  • Neuroscience(all)
  • Computational Theory and Mathematics
  • Mathematics(all)
  • Pharmacology
  • Immunology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)

Cite this

The Role of Space in the Exploitation of Resources. / Kang, Yun; Lanchier, Nicolas.

In: Bulletin of Mathematical Biology, Vol. 74, No. 1, 01.2012, p. 1-44.

Research output: Contribution to journalArticle

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