Geographic variation for wing shape in Drosophila serrata |
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Authors: | Hoffmann Ary A Shirriffs Jennifer |
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Institution: | Centre for Environmental Stress and Adaptation Research, La Trobe University, Bundoora, Victoria 3083, Australia E-mail: |
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Abstract: | Geographic variation in wing shape in female Drosophila serrata was examined by characterizing isofemale strains from 19 localities collected along a transect on the eastern coast of Australia. Shape variation was analyzed by Procrustes superimposition of landmark data followed by canonical variate analysis. The first extracted canonical variate showed a nonlinear association with latitude and accounted for 43% of the variance. There was a sharp increase in this variate at low latitudes as well as a gradual increase at high latitudes. These shape changes were associated with two landmarks at the edge of the wing. There was also a linear change in wing aspect. The isofemale heritability for two measures of shape was around 30%. Allometric relationships were weak both between localities and among isofemale strains within localities. The possibility that wing shape parameters are under selection independent of wing size is discussed. |
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Keywords: | Cline Drosophila serrata geographic variation morphology shape |
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