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Mothers reduce egg provisioning with age

David Giron* and Jérôme Casas Institut de Recherche sur la Biologie de l’Insecte (Centre Nationale de la Recherche Scientifique, Unité Mixte de Recherche 6035), Faculté des Sciences, Université de Tours, 37200 Tours, France *Correspondence: E-mail: giron@univ-tours.fr Abstract Precise and comprehensive data on resource allocation into individual eggs are rare and this empirical void in the literature of life history strategies contrasts with the large number of theoretical studies. We show a marked decrease in reproductive investment in eggs with mother’s age for egg size, sugar, protein, lipid and energy contents of eggs for a parasitic wasp. Egg size is a good predictor of offspring fitness, measured as survival of starving neonate larvae, but does not reveal possible biochemical changes. Lipids stabilize quickly at a minimal threshold while proteins and sugars decrease smoothly down to about 30% of the amount invested in the first egg. Because proteins have the highest correlation with egg size, we predict that they should be better predictors of larval fitness than lipids and sugars. Assessing the adaptive value of the observed patterns will require a multidimensional approach to egg provisioning.