The Gerontologist, Vol 35, Issue 5 588-596, Copyright © 1995 by The Gerontological Society of America

ARTICLES

Sex mortality differentials and selective survival in large medfly cohorts: implications for human sex mortality differentials

JR Carey and P Liedo
Department of Entomology, University of California, Davis 95616, USA.

Experimental studies on male-female mortality differences in nonhuman species are important because they provide insights into both the nature of age-specific gender differences and the concept of selective survival--whether one subgroup in a population (e.g., males) is consistently more frail than another subgroup (e.g., females). We found that it was not possible to classify either sex as more robust or longer lived since relative longevity was conditional on age (young or old), cage conditions (solitary confinement or grouped cages), and treatment (starvation, irradiation, or density). Implications of these findings are discussed including selective survival, demographic selection, a framework for male-female mortality differentials, and an evolutionary perspective on gender differences in longevity.

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				J. R. Carey, P. Liedo, H. Müller, J. Wang, and J. W. Vaupel Dual Modes of Aging in Mediterranean Fruit Fly Females Science, August 14, 1998; 281(5379): 996 - 998. [Abstract] [Full Text]

				H.-G. Muller, J.-L. Wang, W. B. Capra, P. Liedo, and J. R. Carey Early mortality surge in protein-deprived females causes reversal of sex differential of life expectancy in Mediterranean�fruit�flies PNAS, March 18, 1997; 94(6): 2762 - 2765. [Abstract] [Full Text] [PDF]