title: Revisiting the link between breeding effort and oxidative balance through field evaluation of two sympatric sibling insect species.
abstract: The idea that oxidative stress could be a major force governing evolutionary trade-offs has recently been challenged by experimental approaches in laboratory conditions, triggering extensive debates centered on theoretical and methodological issues. Here, we revisited the link between oxidative stress and reproduction by measuring multiple antioxidant and oxidative damages in wild-caught females of two sibling weevil species (Curculio elephas, C. glandium). The strength of our study arised from (1) studied species that were sympatric and exploited similar resource, but displayed contrasting reproductive strategies and (2) individuals were sampled throughout adult life so as to relate oxidative status to breeding effort. We found that the short-lived C. elephas sacrifices red-ox homeostasis for immediate reproduction upon emergence as characterized by low antioxidant defenses and elevated oxidative damage. Comparatively, C. glandium massively invests in antioxidant and maintains low oxidative damage, which may contribute to their extended prereproductive period. Intriguingly, we also reveal, for the first time in a field study, an unexpected reactivation of antioxidant defenses with the onset of reproduction. Our results thus support the existence of a strong, but complex relationship between oxidative stress and life-history evolution and highlight the need for a finer-scale picture of antioxidant strategies.
authors.affiliation: Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université Lyon 1, Université de Lyon, Villeurbanne, France; Wildlife Conservation Physiology, Brain Function Research Group, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa. benjamin.rey@univ-lyon1.fr.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Rey
authors.forename: Pierre-François
authors.initials: PF
authors.lastname: Pélisson
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Bel-Venner
authors.forename: Yann
authors.initials: Y
authors.lastname: Voituron
authors.forename: Samuel
authors.initials: S
authors.lastname: Venner
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D005075:Biological Evolution; D001947:Breeding; D002374:Catalase / Q000378:metabolism; D005260:Female; D006706:Homeostasis; D008297:Male; D009866:Oogenesis; D018384:Oxidative Stress; D012098:Reproduction; D012621:Seasons; D013482:Superoxide Dismutase / Q000378:metabolism; D061350:Sympatry; D048889:Weevils / Q000235:genetics / Q000502:physiology*
chemical_list: D000975:Antioxidants; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Insect; life-history evolution; oxidative stress; reactive oxygen species; sympatric species; weevil