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Self-reinforcing spatial patterns enslave evolution in a host-parasitoid system

N J Savill1, P Rohani, P Hogeweg

  • 1Theoretical Biology and Bioinformatics, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. njs@binf.biol.ruu.nl

Journal of Theoretical Biology
|September 23, 1997
PubMed
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In host-parasitoid models, spatial patterns like spiral waves influence evolution. Parasitoid aggregation strength evolves to reinforce existing patterns, leading to complex eco-evolutionary dynamics.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Mathematical Biology

Background:

  • Spatially structured host-parasitoid models spontaneously form complex spatial patterns, including spiral waves and turbulence.
  • These spatial dynamics can significantly impact ecological and evolutionary processes within interacting populations.

Purpose of the Study:

  • To investigate the eco-evolutionary consequences of spatial patterns in host-parasitoid interactions.
  • To analyze how the evolution of parasitoid dispersal behavior (aggregation strength) is influenced by prevalent spatial structures.

Main Methods:

  • Development and analysis of an eco-evolutionary model incorporating spatial dynamics of host-parasitoid interactions.
  • Simulation of parasitoid evolution, specifically focusing on the trait of aggregation strength (dispersal towards host-dense areas).

Related Experiment Videos

  • Comparison of model behavior with the complex Ginzburg-Landau equation to identify emergent properties.

    • Main Results:

    • The direction and timescale of evolutionary selection pressure on parasitoid aggregation strength are contingent upon the local spatial pattern.
    • Evolutionary processes tend to reinforce the dominant spatial pattern, leading to pattern-specific adaptations.
    • Competition between different spatial patterns emerges as a key factor determining the overall eco-evolutionary outcome.
    • Predicting evolutionary trajectories using simplified statistical measures or subprocesses yields inaccurate and contradictory results.

    Conclusions:

    • The interplay of multiple ecological and evolutionary processes across diverse spatial and temporal scales drives complex emergent behaviors in these systems.
    • Understanding the evolution of host-parasitoid interactions requires considering the emergent spatial structures and their influence on selection pressures.
    • The study highlights the limitations of reductionist approaches in predicting complex eco-evolutionary dynamics and suggests parallels with physical systems like the complex Ginzburg-Landau equation.