Assortative mating and differential male mating success in an ash hybrid zone population |
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Authors: | Pierre R Gérard Etienne K Klein Frédéric Austerlitz Juan F Fernández-Manjarrés Nathalie Frascaria-Lacoste |
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Institution: | 1. Laboratoire Ecologie, Systématique, Evolution, UMR ENGREF-CNRS 8079, Bat. 360, Université Paris-Sud, 91405, Orsay Cedex, France 2. Unité de Biométrie, INRA, Domaine St-Paul, Site Agroparc, 84914, Avignon cedex 9, France
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Abstract: | Background The structure and evolution of hybrid zones depend mainly on the relative importance of dispersal and local adaptation, and
on the strength of assortative mating. Here, we study the influence of dispersal, temporal isolation, variability in phenotypic
traits and parasite attacks on the male mating success of two parental species and hybrids by real-time pollen flow analysis.
We focus on a hybrid zone population between the two closely related ash species Fraxinus excelsior L. (common ash) and F. angustifolia Vahl (narrow-leaved ash), which is composed of individuals of the two species and several hybrid types. This population is
structured by flowering time: the F. excelsior individuals flower later than the F. angustifolia individuals, and the hybrid types flower in-between. Hybrids are scattered throughout the population, suggesting favorable
conditions for their local adaptation. We estimate jointly the best-fitting dispersal kernel, the differences in male fecundity
due to variation in phenotypic traits and level of parasite attack, and the strength of assortative mating due to differences
in flowering phenology. In addition, we assess the effect of accounting for genotyping error on these estimations. |
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