Life history response of Mediterranean fruit flies to dietary restriction |
| |
Authors: | Carey James R Liedo Pablo Harshman Lawrence Zhang Ying Müller Hans-Georg Partridge Linda Wang Jane-Ling |
| |
Institution: | Department of Entomology, and;Department of Statistics, University of California, Davis, CA 95616, USA;El Colegio de la Frontera Sur, Carreterra Antiguo Aeropuerto Km 2.5, 30700, Tapachula, Chiapas, Mexico;School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;Department of Biology, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK |
| |
Abstract: | The purpose of this study was to investigate medfly longevity and reproduction across a broad spectrum of diet restriction using a protocol similar to those applied in most rodent studies. Age-specific reproduction and age of death were monitored for 1200 adult males and 1200 females, each individually maintained on one of 12 diets from ad libitum to 30% of ad libitum. Diet was provided in a fixed volume of solution that was fully consumed each day, ensuring control of total nutrient consumption for every fly. Contrary to expectation and precedence, increased longevity was not observed at any level of diet restriction. Among females, reproduction continued across all diet levels despite the cost in terms of increased mortality. Among males, life expectancy exceeded that of females at most diet levels. However, in both sexes, mortality increased more sharply and the pattern of survival changed abruptly once the diet level fell to 50% of ad libitum or below, even though the energetic demands of egg production has no obvious counterpart in males. We believe that a more complete picture of the life table response to dietary restriction will emerge when studies are conducted on a wider range of species and include both sexes, more levels of diet, and the opportunity for mating and reproduction. |
| |
Keywords: | cost of reproduction life span life table male–female mortality longevity extension sex–mortality differentials |
本文献已被 PubMed 等数据库收录! |
|