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Multistage density dependence in an amphibian.

Res Altwegg1

  • 1Institute of Zoology, University of Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland. altwegg@uvic.ca

Oecologia
|April 18, 2003
PubMed
Summary

Density dependence impacts amphibian populations. High aquatic larval density, not terrestrial juvenile density, reduced pool frog size, influencing population dynamics.

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Area of Science:

  • Ecology
  • Population Biology
  • Amphibian Ecology

Background:

  • Density dependence is a key factor regulating natural population sizes.
  • The life stage at which density dependence occurs significantly affects population dynamics, especially in organisms with complex life cycles.

Purpose of the Study:

  • To investigate the effects of density manipulation during the aquatic larval and terrestrial juvenile stages on pool frog (Rana lessonae) growth and survival.
  • To determine the relative importance of larval versus juvenile density dependence on amphibian population regulation.

Main Methods:

  • Experimental manipulation of pool frog densities during larval and juvenile stages.
  • Monitoring of individual growth and survival rates until one year of age.
  • Analysis of density-dependent effects on growth and survival across different life stages.

Main Results:

  • High aquatic larval density significantly reduced frog size at one year of age.
  • Terrestrial juvenile density did not affect size at one year.
  • Both larval and juvenile densities reduced early juvenile growth, with larval density having a stronger effect.
  • No significant density dependence was observed in survival rates.

Conclusions:

  • Density dependence during the larval stage has a more pronounced impact on pool frog size than during the juvenile stage.
  • Both larval and juvenile stages contribute to density-dependent regulation in amphibian populations.
  • Understanding stage-specific density dependence is crucial for predicting amphibian population dynamics.

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