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De la biologie des reproducteurs au comportement d’approvisionnement du nid, vers des pistes de biocontrôle du frelon asiatique Vespa velutina en France

Abstract : This CIFRE thesis deals with the biology, the behavior and the biological control of aninvasive predator of bees, the hornet Vespa velutina. Since its introduction in France, this hornet isnow invading most countries in occidental Europe, dealing damages both to the environment and thebeekeeping activity. In order to limit its proliferation, a good strategy could consist in disrupting itscolony development at different levels, explored in this work. The first axis deals with V. velutinareproductive biology, exploring the different paths to prevent colonies creation. First we describedthe sexual maturation of males in V. velutina, and second we compared different traits linked tofertility between foundresses of V. velutina and the European hornet, thus highlighting V. velutinahigher precocity and fertility potential. The second axis explored the biology of colonies, fromresource collection to resource distribution in the nest. Using RFID technic, we assessed the actionrange and its boundaries in V. velutina workers. We also labelled food and observed its distribution inV. velutina colonies in function of the colony size and structure. The third axis deals with V. velutinabiocontrol, using entomopathogenic fungi. We evaluated the efficiency of different isolates anddifferent application methods on V. velutina, and described a wild fungus found naturally parasitizingV. velutina. This work brought knowledge on biology behavior and physiology of this invasive hornet,and also proposed options that could be assayed for a durable control of V. velutina.
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Submitted on : Thursday, April 5, 2018 - 1:01:41 AM
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Juliette Poidatz. De la biologie des reproducteurs au comportement d’approvisionnement du nid, vers des pistes de biocontrôle du frelon asiatique Vespa velutina en France. Ecologie, Environnement. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0778⟩. ⟨tel-01758929⟩

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