Le piège cornet modifié, un piège entomologique d’interception conçu pour des conditions difficiles

2019 
An entomological interception trap adapted for use in harsh environments. − Sampling aerial arthropods in harsh environments, including high wind conditions and hard substrates, is chal- lenging due to the difficulties associated with anchoring traps to the ground. This note describes an adaptation of a passive sampling method known as a «cornet» trap and provides a detailed building guide. This type of trap was used to carry out an entomological survey of wild bees (Hymenoptera: Anthophila) and hoverflies (Diptera) on green roofs in the canton of Geneva from March to August 2017. The traps demonstrated good sampling efficiency, especially for wild bees. Resume: Echantillonner les arthropodes aeriens en conditions difficiles (vent et / ou substrat dur) repre- sente un defi car il est souvent impossible d’ancrer un piege au sol. Cette note presente une adaptation du piege cornet, une methode de capture passive, et propose un guide de construction detaille. Ce piege a ete utilise sur des toitures vegetalisees extensives pour effectuer un suivi entomologique des abeilles sauvages (Hymenoptera: Anthophila) et des syrphes (Diptera). Son utilisation de mars a aout 2017 dans le canton de Geneve a demontre une bonne efficacite d’echantillonnage, en particulier pour l’apifaune.
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