Single founder-flush events and the evolution of reproductive isolation


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Authors: Rundle, HD; Mooers, AO; Whitlock, MC
Year: 1998
Journal: Evolution 52: 1850-1855
Title: Single founder-flush events and the evolution of reproductive isolation
Abstract: By demonstrating the evolution of significant premating isolation, previous laboratory experiments have provided some evidence for the founder-flush model of speciation. However, these experiments are subject to a number of criticisms, including the use of hybrid populations recently collected from the wild and the use of multiple bottlenecks. Here we present the results of a test of founder-flush speciation using a single, well-adapted laboratory stock of Drosophila melanogaster subjected to one founder-flush event. The experiment was replicated at larger scale than previous studies, and results indicate that none of 50 independent founder-flush lines evolved significant assortative mating relative to the control (base) population. This suggests a diminished emphasis on population bottlenecks in speciation of D. melanogaster and perhaps in general.
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