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Chaotic dynamics can select for long-term dormancy.

R G Lalonde1, B D Roitberg

  • 1Unit of Biology and Physical Geography, University of British Columbia-Okanagan, 3333 University Way, Kelowna, British Columbia V1V 1V7, Canada. robert.lalonde@ubc.ca

The American Naturalist
|July 29, 2006
PubMed
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Population dormancy is often linked to environmental variance. However, this study shows intrinsic population dynamics can create chaotic fluctuations, favoring dormancy even with high mortality, leading to stabilized populations.

Area of Science:

  • Population Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Extended dormancy in populations is typically considered an evolutionary strategy for bet hedging, implying environmental variance.
  • Dormancy is usually interpreted as evidence of fluctuating environmental conditions impacting population fitness.
  • This interpretation assumes dormancy is solely a response to external environmental unpredictability.

Purpose of the Study:

  • To investigate whether intrinsic population dynamics, independent of environmental variance, can drive the evolution of dormancy.
  • To explore the role of chaotic population dynamics in selecting for dormancy strategies.
  • To determine if dormancy can stabilize populations exhibiting chaotic fluctuations.

Main Methods:

  • Utilized a Ricker-type population model incorporating heritable variation in dormancy.

Related Experiment Videos

  • Simulated population dynamics under conditions with and without environmental variance.
  • Analyzed the selective pressures on dormancy strategies arising from intrinsic chaotic dynamics.

    • Main Results:

    • Intrinsic population dynamics can generate chaotic fluctuations without environmental variance.
    • Chaotic dynamics favor a higher frequency of dormant strategists, even with significant dormancy mortality.
    • The buffering effect of a high frequency of dormant individuals can stabilize chaotic dynamics or lead to low-amplitude periodic orbits.

    Conclusions:

    • Dormancy does not exclusively indicate environmental variance; intrinsic population dynamics can also drive its evolution.
    • Chaotic dynamics can promote the selection and maintenance of dormancy as a stabilizing mechanism.
    • Stabilized populations can harbor a substantial proportion of dormant individuals with varied dormancy propensities.