Rey B., Pélisson P..-F., Bel-Venner M..-C., Voituron Y., Venner S.
Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France; Wildlife Conservation Physiology, Brain Function Research Group, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France
Rey, B., Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France, Wildlife Conservation Physiology, Brain Function Research Group, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Pélisson, P..-F., Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France; Bel-Venner, M..-C., Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France; Voituron, Y., Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France; Venner, S., Laboratoire de Biométrie et Biologie Evolutive, CNRS, UMR, Université de Lyon, Université Lyon 1, Villeurbanne, France
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. © 2015 The Author(s).