title: Does sex-biased dispersal account for the lack of geographic and host-associated differentiation in introduced populations of an aphid parasitoid?
abstract: Host recognition and use in female parasitoids strongly relies on host fidelity, a plastic behavior which can significantly restrict the host preferences of parasitoids, thus reducing the gene flow between parasitoid populations attacking different insect hosts. However, the effect of migrant males on the genetic differentiation of populations has been frequently ignored in parasitoids, despite its known impact on gene flow between populations. Hence, we studied the extent of gene flow mediated by female and male parasitoids by assessing sibship relationships among parasitoids within and between populations, and its impact on geographic and host-associated differentiation in the aphid parasitoid Aphidius ervi. We report evidences of a high gene flow among parasitoid populations on different aphid hosts and geographic locations. The high gene flow among parasitoid populations was found to be largely male mediated, suggested by significant differences in the distribution of full-sib and paternal half-sib dyads of parasitoid populations.
authors.affiliation: Laboratorio de Interacciones Insecto-Planta, Instituto de Ciencias Biológicas, Universidad de Talca 2 Norte 685, Talca, Chile ; Facultad de Ciencias, Universidad Austral de Chile Independencia 641, Valdivia, Chile.
authors.forename: Francisca
authors.initials: F
authors.lastname: Zepeda-Paulo
authors.affiliation: Laboratorio de Interacciones Insecto-Planta, Instituto de Ciencias Biológicas, Universidad de Talca 2 Norte 685, Talca, Chile ; Millennium Nucleus Centre in Molecular Ecology and Evolutionary Applications in the Agroecosystems 2 Norte 685, Talca, Chile.
authors.forename: Blas
authors.initials: B
authors.lastname: Lavandero
authors.affiliation: INRA, Institut de Génétique, Environnement et Protection des Plantes (UMR IGEPP), Domaine de La Motte 35653, Le Rheu Cedex, France.
authors.forename: Frédérique
authors.initials: F
authors.lastname: Mahéo
authors.affiliation: INRA, Institut de Génétique, Environnement et Protection des Plantes (UMR IGEPP), Domaine de La Motte 35653, Le Rheu Cedex, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Dion
authors.affiliation: INRA, Institut de Génétique, Environnement et Protection des Plantes (UMR IGEPP), Domaine de La Motte 35653, Le Rheu Cedex, France.
authors.forename: Yannick
authors.initials: Y
authors.lastname: Outreman
authors.affiliation: INRA, Institut de Génétique, Environnement et Protection des Plantes (UMR IGEPP), Domaine de La Motte 35653, Le Rheu Cedex, France.
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Simon
authors.affiliation: Laboratorio de Interacciones Insecto-Planta, Instituto de Ciencias Biológicas, Universidad de Talca 2 Norte 685, Talca, Chile ; Millennium Nucleus Centre in Molecular Ecology and Evolutionary Applications in the Agroecosystems 2 Norte 685, Talca, Chile.
authors.forename: Christian C
authors.initials: CC
authors.lastname: Figueroa
keywords: Aphid parasitoids; Aphidius ervi; genetic differentiation, sex-biased dispersal; host fidelity; microsatellite loci; sibship inference