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Related Experiment Videos

Survival and production in variable resource environments.

E B Muller1, R M Nisbet

  • 1Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106-9610, USA. muller@lifesci.ucsb.edu

Bulletin of Mathematical Biology
|December 29, 2000
PubMed
Summary
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Dynamic energy budget models reveal how fluctuating food availability impacts organism growth and survival. Variable food stimulates growth but increases starvation risk, with reproduction effects depending on energy allocation strategies.

Area of Science:

  • Ecology
  • Theoretical Biology
  • Physiology

Background:

  • Dynamic energy budget (DEB) models quantify organismal energy assimilation and utilization.
  • Kooijman's kappa-rule model posits competition between somatic and reproductive tissues for energy.

Purpose of the Study:

  • To investigate the dynamic behavior of Kooijman's kappa-rule DEB model under fluctuating food densities.
  • To analyze the effects of periodic and stochastic (pink noise) food fluctuations on growth, mortality, and reproduction.

Main Methods:

  • Simulation of Kooijman's kappa-rule DEB model.
  • Analysis of model responses to periodic and stochastic environmental fluctuations.

Main Results:

  • Variable food supply, both periodic and stochastic, stimulates organism growth.

Related Experiment Videos

  • Stochastic fluctuations increase mortality risk due to starvation.
  • Reproductive output shows complex responses: increased in survivors with stochasticity, but decreased lifetime reproduction; periodic fluctuations' effect on reproduction is kappa-dependent.

    • Conclusions:

    • Fluctuating food availability significantly impacts organismal life history traits.
    • Energy allocation strategies (kappa) mediate the effects of environmental variability on growth, survival, and reproduction.
    • DEB models provide a framework for understanding organismal responses to environmental change.