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Can parasites halt the invader? Mermithid nematodes parasitizing the yellow-legged Asian hornet in France Public Deposited

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  • Since its introduction in France 10 years ago, the yellow-legged Asian bee-hawking hornet Vespa velutina has rapidly spread to neighboring countries (Spain, Portugal, Belgium, Italy, and Germany), becoming a new threat to beekeeping activities. While introduced species often leave behind natural enemies from their original home, which benefits them in their new environment, they can also suffer local recruitment of natural enemies. Three mermithid parasitic subadults were obtained from V. velutina adults in 2012, from two French localities. However, these were the only parasitic nematodes reported up to now in Europe, in spite of the huge numbers of nests destroyed each year and the recent examination of 33,000 adult hornets. This suggests that the infection of V. velutina by these nematodes is exceptional. Morphological criteria assigned the specimens to the genus Pheromermis and molecular data (18S sequences) to the Mermithidae, due to the lack of Pheromermis spp. sequences in GenBank. The species is probably Pheromermis vesparum, a parasite of social wasps in Europe. This nematode is the second native enemy of Vespa velutina recorded in France, after a conopid fly whose larvae develop as internal parasitoids of adult wasps and bumblebees. In this paper, we provide arguments for the local origin of the nematode parasite and its limited impact on hornet colony survival. We also clarify why these parasites (mermithids and conopids) most likely could not hamper the hornet invasion nor be used in biological control programs against this invasive species.
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  • Villemant, C., Zuccon, D., Rome, Q., Muller, F., Poinar Jr., G. O., & Justine, J. L. (2015). Can parasites halt the invader? Mermithid nematodes parasitizing the yellow-legged Asian hornet in France. PeerJ, 3, e947. doi:10.7717/peerj.947
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  • This work was supported by the MEDDE (Ministere de l'Ecologie, du Developpement Durable et de l'Energie), and the NAAS-RDA KOREA (National Academy of Agricultural Science of the Rural Development Administration of the Republic of Korea; project Ecology and integrated control of Vespa velutina, 2013-2014). The salary of Dario Zuccon was covered by a grant from the thematic action of the Museum National d'Histoire Naturelle "Taxonomie moleculaire: DNA Barcode et gestion durable des collections."
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