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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Measurement of Lifespan in Drosophila melanogaster
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Published on: January 7, 2013

Estimating fluctuating selection in age-structured populations.

S Engen1, B-E Saether, T Kvalnes

  • 1Department of Mathematical Sciences, Centre for Conservation Biology, Norwegian University of Science and Technology, Trondheim, Norway.

Journal of Evolutionary Biology
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a method to estimate age-specific selection in populations by weighting individuals based on their reproductive value. It accounts for demographic stochasticity, improving the detection of selection on quantitative traits.

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Area of Science:

  • Evolutionary biology
  • Quantitative genetics
  • Population dynamics

Background:

  • Selection can vary across age classes in age-structured populations.
  • Individual reproductive value is key to understanding combined selection effects.
  • Demographic stochasticity impacts selection inference in finite populations.

Purpose of the Study:

  • To develop a method for estimating age-specific selection on multivariate traits.
  • To incorporate individual reproductive value into selection estimation.
  • To assess the influence of demographic stochasticity on selection inference.

Main Methods:

  • Weighting individuals by their reproductive value to calculate selection differentials.
  • Using age-specific linear regressions of reproductive values on traits.
  • Analyzing age-specific selection on tarsus length and body mass in house sparrows.

Main Results:

  • Combined selection effects are mediated by individual reproductive value.
  • The method allows estimation of weak selection on multivariate traits.
  • Demographic stochasticity increases uncertainty in selection estimates.

Conclusions:

  • Individual reproductive value provides a framework for understanding age-structured selection.
  • Accurate estimation of selection requires accounting for demographic stochasticity.
  • The approach is applicable to fitness-related traits in wild populations.