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Confronting two-sex demographic models with data.

Tom E X Miller1, Brian D Inouye

  • 1Department of Ecology and Evolutionary Biology, Rice University, MS-170, Houston, Texas 77005, USA. Tom.Miller@rice.edu

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Summary
This summary is machine-generated.

This study tested two-sex population models using bean beetles. The harmonic mean model best predicted population dynamics, highlighting the importance of both sexes in density dependence.

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Area of Science:

  • Ecology
  • Population Dynamics
  • Behavioral Ecology

Background:

  • Traditional population models often focus on a single sex.
  • Two-sex models are crucial when the operational sex ratio varies.
  • The best mating function for real populations remains unknown.

Purpose of the Study:

  • To compare alternative two-sex population models using experimental data.
  • To identify the most accurate demographic model for population trajectories.
  • To provide guidelines for designing future empirical studies.

Main Methods:

  • Conducted experiments with laboratory populations of the bean beetle (Callosobruchus maculatus).
  • Manipulated the operational sex ratio and total population density.
  • Compared empirical data against predictions from alternative two-sex models.

Main Results:

  • Strong support was found for a demographic model using the harmonic mean of female and male densities.
  • Birth rate was proportional to the harmonic mean, with unique contributions from females, males, and offspring to density dependence.
  • Experimental designs require significant perturbations of the operational sex ratio for informative results.

Conclusions:

  • The harmonic mean model accurately describes population dynamics in bean beetles.
  • The functional form of density dependence and sex-specific contributions influence the impact of sex ratio perturbations.
  • This research bridges theoretical two-sex population dynamics with empirical data.