Synomones in necrophagous larvae of the blow flies <i>Lucilia sericata</i> and <i>Calliphora vomitoria</i> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Medical and Veterinary Entomology Année : 2022

Synomones in necrophagous larvae of the blow flies Lucilia sericata and Calliphora vomitoria

Résumé

Chemical signals are widespread in insects, but those resulting in interspecific communication (i.e., synomones) remain understudied. Here, we analysed chemicals left on substrates by two species of blow fly larvae, Lucilia sericata (Meigen) and Calliphora vomitoria (Linneaus) (Diptera: Calliphoridae), which can aggregate together on carrion. Using solid-phase microextraction and dynamic headspace analysis, we identified six compounds common to both species: the decanoic, tetradecanoic, pentadecanoic, hexadecanoic and octadecanoic acids, and the 2-ethylhexyl salicylate. We then tested the behavioural effects of the decanoic and pentadecanoic acids using binary-choice experiments, along with the (Z)-9-tricosene, a pheromone found in many arthropods. The time spent by a larva and its average crawling speed were measured in two sides of an arena, where only one contained a compound at 0.25 or 25 μg/μl. No effect was observed when testing the decanoic acid. The pentadecanoic acid only reduced the speed of C. vomitoria larvae at 25 μg/μl. Finally, L. sericata larvae spent less time in the side containing the (Z)-9-tricosene at 0.25 μg/μl, whereas C. vomitoria spent more time and crawled faster in this side at 25 μg/μl. Although these results did not directly evidence synomones, they suggest that the (Z)-9-tricosene could regulate larval aggregations on carrion.
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Dates et versions

hal-03799160 , version 1 (05-10-2022)

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Quentin Fouché, Damien Charabidzé, Christophe Lucas. Synomones in necrophagous larvae of the blow flies Lucilia sericata and Calliphora vomitoria. Medical and Veterinary Entomology, 2022, ⟨10.1111/mve.12614⟩. ⟨hal-03799160⟩
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