A theoretical analysis of the morph frequency variation in the peppered moth over England and Wales |
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Authors: | G S MANI |
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Institution: | Department of Physics, University of Manchester, Manchester M13 9PL |
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Abstract: | The migration-selection model for the spatial and temporal variation of morph frequencies of Biston betularia over England and Wales (Cook & Mani, 1980) has been extended to include effects due to non-visual selection. The parameters for non-visual selection were chosen from the recent determination by Mani (1980) and by Creed et al . (1980). The morph frequencies over England and Wales were obtained through computer simulation and the results were compared with data along the Manchester-Yorkshire, Central Wales-East Anglia and South Wales-London transects. Best fits to the data were obtained by using the non-visual selective values of Mani for carbonaria and modified values of Creed et al . for insularia . It is concluded that the observed polymorphism could be well explained through a balance of migration and visual and non-visual selections. |
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Keywords: | Biston betularia morphs visual and non-visual selection mathematical model migration England Wales |
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