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Density-dependent vital rates and their population dynamic consequences.

M G Neubert1, H C Caswell

  • 1Biology Department, Woods Hole Oceanographic Institution, MA 02543-1049, USA. mneubert@whoi.edu

Journal of Mathematical Biology
|October 20, 2000
PubMed
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Life cycle characteristics significantly impact population dynamics. Density-dependent reproduction is more likely to cause chaotic population dynamics than other density-dependent factors.

Area of Science:

  • Ecology
  • Population Dynamics
  • Mathematical Biology

Background:

  • Population dynamics are influenced by density dependence.
  • Life cycle traits can alter population stability and dynamics.

Purpose of the Study:

  • To compare the effects of density dependence on population dynamics across different life cycles.
  • To analyze nonlinear, two-stage models to understand population dynamics.

Main Methods:

  • Exploration of simple, nonlinear, two-stage models.
  • Characterization of model behavior through equilibria, bifurcations, and nonlinear dynamics.
  • Analysis across a wide range of parameters.

Main Results:

  • Iteroparous life histories exhibit greater stability than semelparous ones.

Related Experiment Videos

  • Increased juvenile survivorship generally stabilizes population dynamics.
  • Density-dependent adult survival is ineffective for controlling populations with high reproductive output.
  • Density-dependent reproduction is a more potent driver of chaotic dynamics compared to other vital rates.
  • Development rate changes have minimal impact on bifurcation patterns.

    • Conclusions:

    • Life history traits and density dependence interact to shape population dynamics.
    • Density-dependent reproduction poses a higher risk for chaotic population dynamics.
    • Model analysis provides generalizations for predicting population stability based on life history traits.