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Science 14 August 1998:
Vol. 281. no. 5379, pp. 996 - 998
DOI: 10.1126/science.281.5379.996
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Reports

Dual Modes of Aging in Mediterranean Fruit Fly Females

James R. Carey, * Pablo Liedo, Hans-Georg Müller, Jane-Ling Wang, James W. Vaupel

The life history of medflies is characterized by two physiological modes with different demographic schedules of fertility and survival: a waiting mode in which both mortality and reproduction are low and a reproductive mode in which mortality is very low at the onset of egg laying but accelerates as eggs are laid. Medflies stay in waiting mode when they are fed only sugar. When fed protein, a scarce resource in the wild, medflies switch to reproductive mode. Medflies that switch from waiting to reproductive mode survive longer than medflies kept in either mode exclusively. An understanding of the physiological shift that occurs between the waiting and reproductive modes may yield information about the fundamental processes that determine longevity.

J. R. Carey, Department of Entomology, University of California, Davis, CA 95616, USA, and Center for the Economics and Demography of Aging, University of California, Berkeley, CA 94720, USA. P. Liedo, El Colegio de la Frontera Sur, Carreterra Antiguo Aeropuerto Km 2.5, 30700, Tapachula, Chiapas, Mexico. H.-G. Müller and J.-L. Wang, Division of Statistics, University of California, Davis, CA 95616, USA. J. W. Vaupel, Max Planck Institute for Demographic Research, Doberaner Strasse 114, D-18057 Rostock, Germany; Odense University Medical School, DK-5000 Odense C, Denmark; Sanford Institute, Duke University, Durham, NC 27706, USA; and Andrus Gerontology Center, University of Southern California, Los Angeles, CA 90089-0191, USA.
*   To whom correspondence should be addressed at Department of Entomology, One Shields Avenue, University of California, Davis, CA 95616, USA. E-mail: jrcarey{at}ucdavis.edu

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