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The role of density-dependent dispersal in source-sink dynamics.

Priyanga Amarasekare1

  • 1Department of Ecology and Evolution, The University of Chicago, 1101 East 57th Street, Chicago IL 60637, USA. amarasek@midway.uchicago.edu

Journal of Theoretical Biology
|December 4, 2003
PubMed
Summary
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Source-sink persistence hinges on density-dependent dispersal and its costs. Accelerating emigration rates minimize extinction risk, while decelerating rates maximize it, highlighting the crucial role of dispersal modes.

Area of Science:

  • Ecology
  • Population Dynamics
  • Conservation Biology

Background:

  • Source-sink dynamics are crucial for metapopulation persistence.
  • The impact of density-dependent dispersal and its costs on source-sink stability is understudied.
  • Emigration can reduce source population growth rates, increasing extinction risk.

Purpose of the Study:

  • To investigate the influence of density-dependent dispersal on source-sink persistence.
  • To analyze the costs of dispersal to source populations.
  • To determine how different modes of density-dependent dispersal affect source-sink stability.

Main Methods:

  • Theoretical modeling of source-sink dynamics.
  • Analysis of per capita growth rates in source and sink populations.

Related Experiment Videos

  • Simulation of population dynamics under varying emigration rates.

    • Main Results:

    • Source-sink persistence critically depends on the interplay between dispersal rate and density-dependence.
    • Accelerating emigration rates (increasing with abundance) minimize dispersal costs and extinction risk.
    • Decelerating emigration rates (increasing with abundance) maximize dispersal costs and extinction risk.
    • Density-independent dispersal has an intermediate effect on extinction risk.

    Conclusions:

    • The mode of density-dependent dispersal is a critical factor in source-sink stability.
    • Dispersal-induced temporal density-dependence can benefit sinks at low abundances but harm sources at high abundances.
    • These findings aid in evaluating the costs and benefits of conserving sink habitats.