Adult mosquito predation and potential impact on the sterile insect technique

Bimbilé Somda Nanwintoum Séverin, Maiga Hamidou, Mamaï Wadaka, Bakhoum Thierno, Wallner Thomas, Poda Serge Bèwadéyir, Yamada Hanano, Bouyer Jérémy. 2022. Adult mosquito predation and potential impact on the sterile insect technique. Scientific Reports, 12 (1):2561, 13 p.

https://doi.org/10.1038/s41598-022-06565-1

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Résumé : The sterile insect technique is a promising environmentally friendly method for mosquito control. This technique involves releasing laboratory-produced sterile males into a target field site, and its effectiveness may be affected by the extent of adult mosquito predation. Sterile males undergo several treatments. Therefore, it is vital to understand which treatments are essential in minimizing risks to predation once released. The present study investigates the predation propensity of four mantis species (Phyllocrania paradoxa, Hymenopus coronatus, Blepharopsis mendica, Deroplatys desiccata) and two gecko species (Phelsuma standingi, P. laticauda) on adult Aedes aegypti, Ae. albopictus and Anopheles arabiensis mosquitoes in a laboratory setting. First, any inherent predation preferences regarding mosquito species and sex were evaluated. Subsequently, the effects of chilling, marking, and irradiation, on predation rates were assessed. The selected predators effectively preyed on all mosquito species regardless of the treatment. Predation propensity varied over days for the same individuals and between predator individuals. Overall, there was no impact of laboratory treatments of sterile males on the relative risk of predation by the test predators, unless purposely exposed to double the required sterilizing irradiation dose. Further investigations on standardized predation trials may lead to additional quality control tools for irradiated mosquitoes.

Mots-clés Agrovoc : lutte anti-insecte, traitement, prédation, lâcher d'insectes stériles, irradiation, Anopheles arabiensis, Aedes albopictus, Aedes aegypti

Mots-clés complémentaires : Deroplatys desiccata, Phelsuma standingi, Phelsuma laticauda, Phyllocrania paradoxa, Hymenopus coronatus, Blepharopsis mendica

Mots-clés libres : Quality control, Gecko, Mantis, Irradiation, Predator

Classification Agris : L72 - Organismes nuisibles des animaux
L20 - Écologie animale

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission, European Research Council

Programme de financement européen : H2020

Projets sur financement : (EU) Revolutionizing Insect Control

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