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Quantitative genetic analysis of the body size and shape of Drosophila buzzatii

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Summary

Body size in Drosophila is known to be closely related to a number of traits with important life history consequences, such as fecundity, dispersal ability and mating success. We examine the quantitative genetic basis of body size in three populations of the cactophilic species Drosophila buzzatii, which inhabit climatically different areas of Australia. Flies were reared individually to eliminate any common environmental component in a full-sib design with families split between two temperatures (18° and 25 °C). The means of several size measures differ significantly among populations while the genetic correlations among these traits generally do not differ, either among populations from different natural environments or between the different laboratory temperatures. This stability of correlation structure is necessary if laboratory estimates of genetic correlations are to have any connection with the expression of genetic variation in the field. The amount of variance due to genotype-by-environment interactions (family x temperature of development) varied among populations, apparently in parallel with the magnitudes of seasonal and diurnal variation in temperature experienced by the different populations. A coastal population, inhabiting a relatively thermally benign environment, showed no interaction, while two inland populations, inhabiting thermally more extreme areas, showed interaction. This interaction term is a measure of the amount of genetic variation in the degree of phenotypic plasticity of body size in response to temperature of development. Thus the inland flies vary in their ability to attain a given body size at a particular temperature while the coastal flies do not. This phenotypic plasticity is shown to be due primarily to differences among genotypes in the amount of response to the change in temperature. A possible selective basis for the maintenance of genetic variation for the levels of phenotypic plasticity is proposed.

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  1. Richard H. Thomas

    Present address: Department of Zoology, The Natural History Museum, Cromwell Road, SW7 5BD, London, UK

Authors and Affiliations

  1. Department of Animal Science, University of New England, 2351, Armidale, NSW, Australia

    Richard H. Thomas & J. S. E Barker

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  1. Richard H. Thomas
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  2. J. S. E Barker
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Communicated by G. Wenzel

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Thomas, R.H., Barker, J.S.E. Quantitative genetic analysis of the body size and shape of Drosophila buzzatii . Theoret. Appl. Genetics 85, 598–608 (1993). https://doi.org/10.1007/BF00220919

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  • DOI: https://doi.org/10.1007/BF00220919

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