Publication with datasets Azevedo et al. 1996, Thermal evolution of egg size in Drosophila melanogaster, Evolution

Egg volume, Fecundity, Genotype-environment interaction, Latitudinal cline, Ovariole number, Phenotypic plasticity, Temperature and Thermal selection


ABSTRACT: We measured the size of eggs produced by populations of Drosophila melanogaster that had been collected along latitudinal gradients in different continents or that had undergone several years of culture at different temperatures in the laboratory. Australian and South American populations from higher latitudes produced larger eggs when all were compared at a standard temperature. Laboratory populations that had been evolving at 16.5°C produced larger eggs than populations that had evolved at 25°C or 29°C, suggesting that temperature may be an important selective agent in producing the latitudinal clines. Flies from laboratory populations produced larger eggs at an experimental temperature of 16.5°C than at 25°C, and there was no indication of genotype-environment interaction for egg size. Evolution of egg size in response to temperature cannot be accounted for by differences in adult body size between populations. It is not clear which life-history traits are direct targets of thermal selection and which are showing correlated responses, and disentangling these is a task for the future.


  • 01 Azevedo et al. 1996, Egg size and ovariole number

    This data file contains means and 95% confidence limits of egg size (mm3) and mean ovariole number of 20 Drosophila melanogaster locations collected at 13 latitudes in 1993 (extracted from Fig 1&2). Note longitudes in data are approximate.

Publication Citations

  • Azevedo, Ricardo B. R., French, Vernon & Partridge, Linda, 'Thermal evolution of egg size in Drosophila melanogaster', Evolution, vol. 50, no. 6, 1996, pp. 2338-2345. Details

Digital Resources

Materials and Methods - Azevedo et al. 1996, Evolution