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Related Experiment Videos

Selection for life span in Drosophila melanogaster.

L S Luckinbill, M J Clare

    Heredity
    |August 1, 1985
    PubMed
    Summary

    Fruit fly reproduction age significantly impacts lifespan. High larval competition boosts longevity when selected for late reproduction, creating distinct long- and short-lived lines. Low competition yields unpredictable results.

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    Biogerontology·2001

    Area of Science:

    • Evolutionary biology
    • Gerontology
    • Genetics

    Background:

    • Senescence, the biological process of aging, is influenced by reproductive timing.
    • Previous studies on aging in Drosophila melanogaster have yielded inconsistent results regarding selection for lifespan.
    • The role of environmental factors, specifically larval density, in shaping evolutionary responses to aging is not fully understood.

    Purpose of the Study:

    • To investigate the impact of selection for early or late reproduction on lifespan in Drosophila melanogaster.
    • To determine the effect of varying larval densities on the response to selection for longevity.
    • To explore the genetic and environmental factors influencing lifespan evolution.

    Main Methods:

    • Populations of Drosophila melanogaster were subjected to selection for early or late reproduction over 21–29 generations.
    • Two experimental treatments involving high (uncontrolled) and low larval densities were implemented.
    • Lifespan and reproductive traits were measured to assess the response to selection.

    Main Results:

    • Under high larval density, selection for late reproduction significantly increased adult lifespan by up to 50%, establishing true-breeding long- and short-lived lines.
    • Under low larval density, lifespan showed wild fluctuations, with little overall response to selection.
    • These findings suggest that gene-environment interactions, particularly larval competition, are critical for observing evolutionary responses in lifespan.

    Conclusions:

    • Larval density is a crucial environmental factor mediating the evolutionary response of lifespan to selection.
    • Competition-free environments may mask or reverse genetic correlations, hindering adaptation of lifespan.
    • Understanding gene-environment interactions is essential for resolving inconsistencies in senescence research and for predicting evolutionary trajectories of aging.

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