title: Production of Early Diploid Males by European Colonies of the Invasive Hornet Vespa velutina nigrithorax.
abstract: The invasive yellow-legged hornet Vespa velutina nigrithorax was accidentally introduced in Europe in the early 2000s. As is the case in colonies of other wasp and hornet species, V. velutina colonies are known to produce sexuals (males and new queens) at the end of the summer. We show that early-stage colonies in French populations frequently produce males well before the usual reproductive period. The vast majority of the males produced are diploid, which is consistent with the loss of genetic diversity previously reported in introduced populations in France. Since males do not participate in colony activities, the production of early diploid males at the expense of workers is expected to hamper colony growth and, ultimately, decrease the expansion of the species in its invasive range in Europe.
authors.affiliation: IRBI, UMR CNRS 7261, University of Tours, Faculty of Sciences, Parc de Grandmont, 37200 Tours, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Darrouzet
authors.affiliation: IRBI, UMR CNRS 7261, University of Tours, Faculty of Sciences, Parc de Grandmont, 37200 Tours, France.
authors.forename: Jérémy
authors.initials: J
authors.lastname: Gévar
authors.affiliation: IRBI, UMR CNRS 7261, University of Tours, Faculty of Sciences, Parc de Grandmont, 37200 Tours, France.
authors.forename: Quentin
authors.initials: Q
authors.lastname: Guignard
authors.affiliation: Evolution Biologique & Ecologie, Université Libre de Bruxelles, 1050 Brussels, Belgium.
authors.forename: Serge
authors.initials: S
authors.lastname: Aron
mesh_terms: D000818:Animals; D004171:Diploidy; D005602:France; D014644:Genetic Variation; D058865:Introduced Species; D008297:Male; D012098:Reproduction / Q000502:physiology; D014863:Wasps / Q000502:physiology*