Evaluating possible reinforcement in campanula americana: response to postzygotic isolation by increasing selfing

Hanqin Wu
Allopatry leads to postzygotic isolation through the accumulation of genetic incompatibilities between different lineages. Consequently, when lineages come into secondary contact, the fitness of hybrids between lineages will be reduced. Then a process called reinforcement may occur, where selection to avoid hybridization leads to the evolution of greater prezygotic isolation between lineages. Selfing is reported as a mechanism of prezygotic isolation between sympatric sister species that contributes to reinforcement, but whether selfing also is involved...
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