A Mortality Cost of Virginity at Older Ages in Female Mediterranean Fruit Flies

Authors

James R. Carey, University of California, DavisFollow
Pablo Liedo, El Colegio de la Frontera Sur, Tapachula, ChiapasFollow
Lawrence G. Harshman, University of Nebraska - LincolnFollow
Ying Zhang, University of California, Davis
Hans-Georg Müller, University College London
Linda Partridge, University College London, Wolfson House, 4 Stephenson Way, London
Jane-Ling Wang, University of California, DavisFollow

Date of this Version

2002

Document Type

Article

Citation

Experimental Gerontology 37 (2002), pp. 507–512

Comments

© 2002 Elsevier Science, Inc. Used by permission

Abstract

Mortality rates were measured over the lifetime of 65,000 female Mediterranean fruit flies, Ceratitis capitata, maintained in either all-female (virgin) cages or cages with equal initial numbers of males, to determine the effect of sexual activity and mating on the mortality trajectory of females at older ages. Although a greater fraction of females maintained in all-female (virgin) cages survived to older ages, the life expectancy of the surviving virgins was less than the life expectancy of surviving non-virgins at older ages. This was due to a mortality crossover where virgin flies experience lower mor-tality than mated flies from eclosion to Day 20 but higher mortality thereafter. These results suggest that there are two consequences of mating—a short-term mortality increase (cost) and a longer term mortality decrease (benefit).