Patterns of reproductive isolation in nolana (chilean bellflower) |
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Authors: | Cathleen Jewell Amy Douglas Papineau Rosanna Freyre Leonie C Moyle |
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Institution: | Department of Biology, Indiana University, Bloomington, Indiana 47408 Department of Plant Biology, University of New Hampshire, Durham, New Hampshire 03824 Department of Environmental Horticulture, University of Florida, Gainesville, Florida 32611 E-mail: lmoyle@indiana.edu. |
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Abstract: | We examined reproductive isolating barriers at four postmating stages among 11 species from the morphologically diverse genus Nolana (Solanaceae). At least one stage was positively correlated with both genetic and geographic distance between species. Postzygotic isolation was generally stronger and faster evolving than postmating prezygotic isolation. In addition, there was no evidence for mechanical isolation, or for reproductive character displacement in floral traits that can influence pollinator isolation. In general, among the potential isolating stages examined here, postzygotic barriers appear to be more effective contributors to reducing gene flow, including between sympatric species. |
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Keywords: | Character displacement hybrid postzygotic prezygotic reinforcement speciation |
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