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Related Experiment Videos

Coexistence of macroparasites without direct interactions.

A Pugliese1

  • 1Dipartimento di Matematica, Università degli Studi di Trento, Via Sommarive 14, Povo (Trento), 38050, Italy. pugliese@science.unitn.it

Theoretical Population Biology
|May 4, 2000
PubMed
Summary

Macroparasite coexistence requires a trade-off between virulence and transmissibility, enabling survival in narrow ecological niches. Parasite aggregation does not significantly impact this coexistence.

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Area of Science:

  • Ecology
  • Parasitology
  • Mathematical Biology

Background:

  • Understanding macroparasite coexistence is crucial for host-parasite dynamics.
  • Previous models often used approximations, potentially limiting accurate predictions.
  • The infinite-dimensional model by Anderson and May provides a foundation for studying complex interactions.

Purpose of the Study:

  • To extend the infinite-dimensional model to analyze the coexistence of multiple macroparasite species.
  • To determine the conditions under which two parasite species can coexist.
  • To investigate the impact of parasite aggregation on coexistence.

Main Methods:

  • Extension of Anderson and May's infinite-dimensional model.
  • Analysis of exact invadability conditions for multiple parasite species.

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  • Incorporation of clumped infections and host population heterogeneity to model aggregation.

    • Main Results:

    • Coexistence is possible only with a trade-off between parasite virulence and transmissibility, within a narrow parameter range.
    • A more virulent and less transmissible parasite competitively excludes others, contrary to some approximate models.
    • Parasite aggregation, through clumped infections or host heterogeneity, does not alter the width of the coexistence region.

    Conclusions:

    • A specific trade-off is essential for macroparasite coexistence in this extended model.
    • The model's predictions highlight the importance of exact conditions over approximations.
    • Parasite aggregation has a negligible effect on the fundamental conditions for coexistence.