Title |
The case for negative senescence
|
---|---|
Published in |
Theoretical Population Biology, June 2004
|
DOI | 10.1016/j.tpb.2003.12.003 |
Pubmed ID | |
Authors |
James W. Vaupel, Annette Baudisch, Martin Dölling, Deborah A. Roach, Jutta Gampe |
Abstract |
Negative senescence is characterized by a decline in mortality with age after reproductive maturity, generally accompanied by an increase in fecundity. Hamilton (1966) ruled out negative senescence: we adumbrate the deficiencies of his model. We review empirical studies of various plants and some kinds of animals that may experience negative senescence and conclude that negative senescence may be widespread, especially in indeterminate-growth species for which size and fertility increase with age. We develop optimization models of life-history strategies that demonstrate that negative senescence is theoretically possible. More generally, our models contribute to understanding of the evolutionary and demographic forces that mold the age-trajectories of mortality, fertility and growth. |
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Germany | 1 | 13% |
United States | 1 | 13% |
Russia | 1 | 13% |
Spain | 1 | 13% |
Unknown | 4 | 50% |
Demographic breakdown
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Members of the public | 7 | 88% |
Scientists | 1 | 13% |
Mendeley readers
Geographical breakdown
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United Kingdom | 4 | 1% |
Mexico | 2 | <1% |
Spain | 2 | <1% |
Portugal | 1 | <1% |
Netherlands | 1 | <1% |
Brazil | 1 | <1% |
Sweden | 1 | <1% |
Unknown | 270 | 94% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Researcher | 61 | 21% |
Student > Ph. D. Student | 58 | 20% |
Student > Bachelor | 32 | 11% |
Student > Master | 30 | 10% |
Professor | 25 | 9% |
Other | 48 | 17% |
Unknown | 32 | 11% |
Readers by discipline | Count | As % |
---|---|---|
Agricultural and Biological Sciences | 134 | 47% |
Environmental Science | 27 | 9% |
Biochemistry, Genetics and Molecular Biology | 25 | 9% |
Social Sciences | 14 | 5% |
Medicine and Dentistry | 11 | 4% |
Other | 34 | 12% |
Unknown | 41 | 14% |