Darrouzet Eric, Gévar Jérémy, Guignard Quentin, Aron Serge
IRBI, UMR CNRS 7261, University of Tours, Faculty of Sciences, Parc de Grandmont, 37200 Tours, France.
Evolution Biologique & Ecologie, Université Libre de Bruxelles, 1050 Brussels, Belgium.
PLoS One. 2015 Sep 28;10(9):e0136680. doi: 10.1371/journal.pone.0136680. eCollection 2015.
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.
入侵性黄腿胡蜂黑胸胡蜂于21世纪初意外传入欧洲。与其他黄蜂和胡蜂种类的蜂群情况一样，黑胸胡蜂蜂群在夏末会产生有性个体（雄蜂和新蜂王）。我们发现，法国种群中的早期蜂群经常在正常繁殖期之前就大量产生雄蜂。所产生的雄蜂绝大多数是二倍体，这与之前报道的法国引入种群中遗传多样性的丧失是一致的。由于雄蜂不参与蜂群活动，以工蜂为代价产生早期二倍体雄蜂预计会阻碍蜂群的生长，并最终减少该物种在其欧洲入侵范围内的扩散。
