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Genetical composition, temperature, density and selection in an enzyme polymorphism.

A J Birley, J A Beardmore

    Heredity
    |August 1, 1977
    PubMed
    Summary
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    Frequency dependent selection at the Esterase-6 locus in Drosophila melanogaster was strongly influenced by temperature and density. These factors interact to modify selection strength, suggesting a chemical mechanism in the larval environment.

    Area of Science:

    • * Evolutionary Biology
    • * Population Genetics
    • * Drosophila melanogaster Research

    Background:

    • * The Esterase-6 locus in Drosophila melanogaster is crucial for reproductive success.
    • * Understanding selection pressures on genetic loci is key to evolutionary studies.
    • * Environmental factors like temperature and density can significantly impact insect populations.

    Purpose of the Study:

    • * To investigate frequency dependent selection at the Esterase-6 locus.
    • * To determine the influence of temperature, density, and genetic composition on this selection.
    • * To explore potential chemical mediation of frequency dependent selection.

    Main Methods:

    • * A factorial experiment was designed with four temperature levels (15°C, 20°C, 25°C, 30°C).

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  • * Three larval food density conditions were used (115 ml, 10 ml, 2.5 ml).
  • * Genetical composition was varied to assess its interaction with environmental factors.

    • Main Results:

    • * Strong frequency dependent selection was observed across various environmental conditions.
    • * The interaction between temperature and density significantly modified the strength of frequency dependent selection.
    • * Evidence suggests a chemical mechanism, influenced by larval environment conditioning, mediates this selection.

    Conclusions:

    • * Temperature and density are critical interacting factors shaping frequency dependent selection at the Esterase-6 locus.
    • * The findings support a chemical mediation hypothesis for frequency dependent selection in Drosophila.
    • * Further research into larval environment conditioning is warranted to elucidate the precise mechanisms.