Exposure to pyriproxyfen pesticide (juvenile hormone agonist) does not alter maternal care and reproduction in the European earwig
2022
Merleau, Leslie-Anne | Larrigaldie, Izïa | Bousquet, Océane | Devers, Séverine | Keller, Matthieu | Lécureuil, Charlotte | Meunier, Joël | Institut de recherche sur la biologie de l'insecte (IRBI) ; Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) | Physiologie de la reproduction et des comportements [Nouzilly] (PRC) ; Institut Français du Cheval et de l'Equitation [Saumur] (IFCE)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Région Centre-Val de Loire | Office Français de la Biodiversité (Ecophyto 2+)
International audience
显示更多 [+] 显示较少 [-]英语. Sublethal exposure to pesticides can alter the survival and reproduction of a wide range of non-target organisms. However, it remains unclear whether this exposure can alter behaviours that are often essential for long-term population dynamics and maintenance, such as parental care. In this study, we tested the effect of pyriproxyfen exposure (an insect growth regulator) on maternal care in the European earwig, an insect that is both used in pest control in pip-fruit orchards and considered a pest in stone fruit orchards. We exposed 424 females at doses either 10 times lower, equivalent or 10 times higher than normal application rates in French orchards. As maternal care can change over the weeks of family life, we exposed the earwig mothers at five different days before and after egg hatching. We then measured the expression of ten forms of maternal care towards eggs and juveniles, six non-caring behaviours, eggs and juveniles development, metabolic reserves in mothers at egg hatching and females' production of a terminal clutch. First, our results revealed that the three tested doses of pyriproxyfen were non-lethal and confirmed that maternal care decreased throughout both pre-and post-hatching family life. However, we did not detect any effect of pyriproxyfen on maternal care and non-care behaviours, eggs and juveniles development, quantities of lipids, proteins and glycogen in mothers at egg hatching, and on the production of a future clutch. Overall, these findings suggest that the maximal doses of pyriproxyfen authorized in French orchards is likely to have limited effects on the short-and long-term maintenance of populations of the European earwig, and raises fundamental questions about the nature of the link between juvenile hormone and parental care in insects.
显示更多 [+] 显示较少 [-]