Abstract
The body sizes and shapes of Poikilothermic animals generally show clinal variation with latitude. Among the environmental factors responsible for the cline, temperature seems to be the most probable candidate. In the present work we analysed natural populations of Drosophila melanogaster collected at different geographical localities to determine whether the same selective forces acting on wing development in the laboratory are also at work in the wild. We show that the temperature selection acting on wing development in the laboratory is only one of the selective forces operating in the wild. The size differences between natural populations seem to depend exclusively on cell number whereas they depend on cell area in the laboratory. The two wing compartments behave as distinct units of selection subjected to different genetic control, confirming our previous observations on laboratory populations. In addition, subunits of development defined as regions of cell proliferation centres restricted within longitudinal veins can, in turn, be considered as subunits of selection. Their interaction during development and continuous natural selection around an optimum could explain the high wing shape stability generally found in natural populations.
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Pezzoli, M., Guerra, D., Giorgi, G. et al. Developmental constraints and wing shape variation in natural populations of Drosophila melanogaster. Heredity 79, 572–577 (1997). https://doi.org/10.1038/hdy.1997.201
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DOI: https://doi.org/10.1038/hdy.1997.201
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