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Interference competition and species coexistence.

Priyanga Amarasekare1

  • 1Department of Ecology and Evolution, The University of Chicago, 1101 East 5th Street, Chicago, IL 60637, USA. amarasek@uchicago.edu

Proceedings. Biological Sciences
|February 8, 2003
PubMed
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Species coexistence depends on the type of interference competition. Classical interference prevents coexistence, while beneficial interference allows it through trade-offs, impacting resource exploitation dynamics.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Biology

Background:

  • Interference competition is common in nature but its impact on resource exploitation, especially with dynamic resources, is understudied.
  • Existing models often simplify the complex interplay between exploitative and interference competition.

Purpose of the Study:

  • To model exploitative and interference competition with explicit resource dynamics.
  • To investigate how different forms of interference (classical vs. broad sense) affect species coexistence and competitive exclusion.
  • To explore the role of trade-offs between resource exploitation and interference in determining ecological outcomes.

Main Methods:

  • Development of a mathematical model incorporating biotic and abiotic resource dynamics.
  • Analysis of scenarios with classical interference (net negative impact) and broad-sense interference (mixed impacts).

Related Experiment Videos

  • Examination of coexistence conditions under trade-offs between exploitation efficiency and interference intensity.

    • Main Results:

    • Classical interference competition prevents coexistence, even with trade-offs, shifting exclusion from resource exploitation dominance to priority effects.
    • Broad-sense interference, where species can benefit from interfering with others, allows coexistence through exploitation-interference trade-offs.
    • Model outcomes are independent of whether the resource is biotic or abiotic.

    Conclusions:

    • Species engaging in costly interference require beneficial interference mechanisms for coexistence.
    • Invasive species likely possess superior resource exploitation and strong, low-cost interference against native species.
    • The model provides a framework for understanding competition dynamics and predicting invasion success.