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• W2047671267 startingPage "e1000341" @default.
• W2047671267 abstract "Reinforcement, a process by which natural selection increases reproductive isolation between populations, has been suggested to be an important force in the formation of new species. However, all existing cases of reinforcement involve an increase in mate discrimination between species. Here, I report the first case of reinforcement of postmating prezygotic isolation (i.e., barriers that act after mating but before fertilization) in animals. On the slopes of the African island of São Tomé, Drosophila yakuba and its endemic sister species D. santomea hybridize within a well-demarcated hybrid zone. I find that D. yakuba females from within this zone, but not from outside it, show an increase in gametic isolation from males of D. santomea, an apparent result of natural selection acting to reduce maladaptive hybridization between species. To determine whether such a barrier could evolve under laboratory conditions, I exposed D. yakuba lines derived from allopatric populations to experimental sympatry with D. santomea, and found that both behavioral and gametic isolation become stronger after only four generations. Reinforcement thus appears to be the best explanation for the heightened gametic isolation seen in sympatry. This appears to be the first example in animals in which natural selection has promoted the evolution of stronger interspecific genetic barriers that act after mating but before fertilization. This suggests that many other genetic barriers between species have been increased by natural selection but have been overlooked because they are difficult to study." @default.
• W2047671267 created "2016-06-24" @default.
• W2047671267 creator A5044075094 @default.
• W2047671267 date "2010-03-23" @default.
• W2047671267 modified "2023-10-09" @default.
• W2047671267 title "Reinforcement of Gametic Isolation in Drosophila" @default.
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• W2047671267 doi "https://doi.org/10.1371/journal.pbio.1000341" @default.
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• W2047671267 hasPublicationYear "2010" @default.
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