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Shampa M. Ghosh and Amitabh Joshi Evolution of reproductive isolation as a by-product of divergent life-history evolution in laboratory populations of Drosophila melanogaster Ecology and Evolution 2

Article first published online: 19 NOV 2012 | DOI: 10.1002/ece3.413

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We show that long-term selection for rapid development and early reproduction in laboratory populations of Drosophila melanogaster led to the evolution of reproductive isolation between the selected populations and their ancestral controls presumably due to body size divergence. Small females of fast developing lines show high mortality rate after mating with large ancestral line males giving rise to unidirectional postcopulatory prezygotic isolation. Small males from the fast developing lines, on the other hand, obtain few matings with large control line females showing evolution of a premating barrier in the other direction. Flies from ancestral populations shown in the upper row; lower row showing individuals from fast developing populations.

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