Abstract
Food availability is a major environmental factor that can influence life history within and across generations through direct effects on individual quality and indirect effects on the intensity of intra- and intercohort competition. Here, we investigated in yearling and adult common lizards (Zootoca vivipara) the immediate and delayed life-history effects of a prolonged food deprivation in the laboratory. We generated groups of fully fed or food-deprived yearlings and adults at the end of one breeding season. These lizards were released in 16 outdoor enclosures together with yearlings and adults from the same food treatment and with food-deprived or fully fed juveniles, creating four types of experimental populations. Experimental populations were then monitored during 2 years, which revealed complex effects of food on life-history trajectories. Food availability had immediate direct effects on morphology and delayed direct effects on immunocompetence and female body condition at winter emergence. Also, male annual survival rate and female growth rate and body size were affected by an interaction between direct effects of food availability and indirect effects on asymmetric competition with juveniles. Reproductive outputs were insensitive to past food availability, suggesting that female common lizards do not solely rely on stored energy to fuel reproduction. Finally, food conditions had socially-mediated intergenerational effects on early growth and survival of offspring through their effects on the intensity of competition. This study highlights the importance of social interactions among cohorts for life-history trajectories and population dynamics in stage-structured populations.
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Acknowledgments
We thank B. Decencière, M. Paquet and all students for assistance in the field. Raoul Van Damme and two anonymous reviewers made useful suggestions to increase the quality of a previous version of this article. This research was supported by the Centre National de la Recherche Scientifique (CNRS), an Agence Nationale de la Recherche (ANR) grant (07-JCJC-0120) to J.F.L.G., grants from the Institut Federatif Ecologie-Biodiversité-Evolution-Environnement (IFR 101) and a grant from the Région Île-de-France (Réseau de Recherche sur le Développement Soutenable R2DS 2007-006) to J.-F. L.G. and M.M.
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Communicated by Raoul Van Damme.
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Mugabo, M., Marquis, O., Perret, S. et al. Direct and socially-mediated effects of food availability late in life on life-history variation in a short-lived lizard. Oecologia 166, 949–960 (2011). https://doi.org/10.1007/s00442-011-1933-0
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DOI: https://doi.org/10.1007/s00442-011-1933-0