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Long-Term Cost of Reproduction with and without Accelerated Senescence in Callosobruchus maculatus: Analysis of Age-Specific Mortality

Marc Tatar, James R. Carey and James W. Vaupel
Evolution
Vol. 47, No. 5 (Oct., 1993), pp. 1302-1312
DOI: 10.2307/2410149
Stable URL: http://www.jstor.org/stable/2410149
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Long-Term Cost of Reproduction with and without Accelerated Senescence in Callosobruchus maculatus: Analysis of Age-Specific Mortality
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Abstract

Age-specific mortality is measured to characterize the costs of reproduction in the beetle Callosobruchus maculatus, providing explicit details of the timing, duration, magnitude, and acceleration of mortality. We experimentally manipulated reproductive effort in four cohorts of 200 individually housed females by controlling exposure to males and to an artificial oviposition substrate. We demonstrate that (1) early reproduction produces long-term increases in age-specific mortality; (2) egg-laying effort affects the onset of age-specific mortality but not its shape or rate of change; and (3) mating with subsequent reproduction increases the rate of change in age-specific mortality relative to virgins. Accelerated senescence is defined demographically as an increase in the rate of change of age-specific mortality. Our results challenge the hypothesis that reproductive effort accelerates senescence but provides evidence that mating itself may have this effect.

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