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Types of Selection01:46

Types of Selection

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Estimating phenotypic selection in age-structured populations by removing transient fluctuations.

Steinar Engen1, Thomas Kvalnes, Bernt-Erik Sæther

  • 1Centre for Biodiversity Dynamics, Department of Mathematical Sciences, , Norwegian University of Science and Technology, N-7491, Trondheim, Norway.

Evolution; International Journal of Organic Evolution
|June 4, 2014
PubMed
Summary

Reproductive value weighting in age-structured populations clarifies selection by removing transient fluctuations. This method distinguishes true age-specific selection from noise, improving evolutionary studies.

Keywords:
Age structureRobertson-Price equationdemographic stochasticityphenotypic evolutionquantitative geneticsreproductive valuereproductive value weighting

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Population Dynamics

Background:

  • The Robertson-Price equation models mean phenotype changes in populations.
  • Age structure can introduce confounding temporal changes misinterpreted as selection.
  • Distinguishing true selection from demographic artifacts is crucial in evolutionary studies.

Purpose of the Study:

  • To extend the selection differential for age-structured populations.
  • To differentiate true selection from transient effects caused by age distribution fluctuations.
  • To provide a method for accurately estimating age-specific selection.

Main Methods:

  • Extension of the Robertson-Price equation to incorporate age structure.
  • Application of reproductive value weighting to analyze phenotypic changes.
  • Decomposition of phenotypic changes into between- and within-age class components.
  • Derivation of selection differentials for continuous-time age-structured models.

Main Results:

  • Reproductive value weighting eliminates transient fluctuations, revealing true selection.
  • The between-age class component, termed transient quasi-selection, is identified as noise.
  • Transient quasi-selection can be omitted when estimating age-specific fecundity or viability selection.
  • The study provides a framework applicable to both simulated and real-world populations (e.g., house sparrows).

Conclusions:

  • Reproductive value weighting is essential for accurate selection analysis in age-structured populations.
  • The proposed method effectively isolates age-specific selection components.
  • This approach enhances the understanding of evolutionary processes in populations with fluctuating age structures.