Understanding the role of eco-evolutionary feedbacks in host-parasite coevolution

Ben Ashby, Ryosuke Iritani, Alex Best, Andrew White, Mike Boots

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Abstract

It is widely recognised that eco-evolutionary feedbacks can have important implications for evolution. However, many models of host-parasite coevolution omit eco-evolutionary feedbacks for the sake of simplicity, typically by assuming the population sizes of both species are constant. It is often difficult to determine whether the results of these models are qualitatively robust if eco-evolutionary feedbacks are included. Here, by allowing interspecific encounter probabilities to depend on population densities without otherwise varying the structure of the models, we provide a simple method that can test whether eco-evolutionary feedbacks per se affect evolutionary outcomes. Applying this approach to explicit genetic and quantitative trait models from the literature, our framework shows that qualitative changes to the outcome can be directly attributable to eco-evolutionary feedbacks. For example, shifting the dynamics between stable monomorphism or polymorphism and cycling, as well as changing the nature of the cycles. Our approach, which can be readily applied to many different models of host-parasite coevolution, offers a straightforward method for testing whether eco-evolutionary feedbacks qualitatively change coevolutionary outcomes.
Original languageEnglish
Pages (from-to)115-125
Number of pages11
JournalJournal of Theoretical Biology
Volume464
Early online date23 Dec 2018
DOIs
Publication statusPublished - 7 Mar 2019

Keywords

  • Coevolution
  • Fluctuating selection
  • Host-parasite
  • Polymorphism
  • Population dynamics
  • Population genetics
  • Quantitative genetics

ASJC Scopus subject areas

  • Statistics and Probability
  • Modelling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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