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Types of Selection

Types of Selection

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...

Frequency-dependent Selection

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Related Experiment Video

Updated: May 4, 2026

A Venturi Effect Can Help Cure Our Trees

A Venturi Effect Can Help Cure Our Trees

Published on: October 1, 2013

[Silvicultural treatments and their selection effects].

¹Institut der experimentellen Botanik der Tschechoslowakischen Akademie der Wissenschaften, Brno, ĈSSR.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik

|January 16, 2014

Summary

Forestry selection focuses on genotypes for improved timber production. Applying directional selection principles and analyzing genetic parameters like heritability can enhance forest stand quality and economic success.

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Last Updated: May 4, 2026

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Published on: October 1, 2013

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Area of Science:

Forestry science
Quantitative genetics
Silviculture

Context:

Forestry practices involve selecting trees for improved growth and timber quality.
Traditional silvicultural treatments aim for increased forest production.
Effective selection requires considering the hereditary properties (genotypes) of trees.

Purpose:

To explore genetic parameters for evaluating silvicultural treatments.
To demonstrate the application of selection differential, heritability, and genetic gain.
To provide economic criteria for assessing forest stand treatments based on genetic composition.

Summary:

This study examines genetic parameters to quantify the effectiveness of silvicultural selection methods.
Analysis includes selection differential, heritability (narrow and broad sense), and genetic/genotypic gain.
Higher selection intensity correlates with greater gains, especially in variable natural forests compared to uniform stands.

Impact:

Provides a framework for estimating the economic success of silvicultural treatments.
Highlights the importance of genotype differentiation for evaluating selection efficacy.
Enables prediction of the genetic composition of future forest generations, informing long-term management strategies.