LONG-TERM COST OF REPRODUCTION WITH AND WITHOUT ACCELERATED SENESCENCE IN CALLOSOBRUCHUS-MACULATUS - ANALYSIS OF AGE-SPECIFIC MORTALITY

被引:90
作者
TATAR, M
CAREY, JR
VAUPEL, JW
机构
[1] UNIV CALIF DAVIS, DEPT ENTOMOL, DAVIS, CA 95616 USA
[2] DUKE UNIV, CTR DEMOG STUDIES, DURHAM, NC 27706 USA
[3] ODENSE UNIV, SCH MED, CTR HLTH & SOCIAL POLICY, DK-5000 ODENSE C, DENMARK
关键词
AGE-SPECIFIC MORTALITY; BRUCHIDAE; COST OF REPRODUCTION; FORCE OF MORTALITY; SENESCENCE; SURVIVAL ANALYSIS;
D O I
10.1111/j.1558-5646.1993.tb02156.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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.
引用
收藏
页码:1302 / 1312
页数:11
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