Effect of extrinsic mortality on the evolution of senescence in guppies
Classical theories for the evolution of senescence predict that organisms that experience low mortality rates attributable to external factors, such as disease or predation, will evolve a later onset of senescence. Here we use patterns of senescence in guppies derived from natural populations that d...
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| Veröffentlicht in: | Nature 2004-10, Vol.431 (7012), p.1095-1099 |
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| creator | Reznick, David N Bryant, Michael J Roff, Derek Ghalambor, Cameron K Ghalambor, Dionna E |
| description | Classical theories for the evolution of senescence predict that organisms that experience low mortality rates attributable to external factors, such as disease or predation, will evolve a later onset of senescence. Here we use patterns of senescence in guppies derived from natural populations that differ in mortality risk to evaluate the generality of these predictions. We have previously found that populations experiencing higher mortality rates evolve earlier maturity and invest more in reproduction, as predicted by evolutionary theory. We report here that these same populations do not have an earlier onset of senescence with respect to either mortality or reproduction but do with respect to swimming performance, which assesses neuromuscular function. This mosaic pattern of senescence challenges the generality of the association between decreased extrinsic mortality and delayed senescence and invites consideration of more derived theories for the evolution of senescence. |
| doi_str_mv | 10.1038/nature02936 |
| format | Article |
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Here we use patterns of senescence in guppies derived from natural populations that differ in mortality risk to evaluate the generality of these predictions. We have previously found that populations experiencing higher mortality rates evolve earlier maturity and invest more in reproduction, as predicted by evolutionary theory. We report here that these same populations do not have an earlier onset of senescence with respect to either mortality or reproduction but do with respect to swimming performance, which assesses neuromuscular function. 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| subjects | Aging - physiology Agnatha. Pisces Animal and plant ecology Animal, plant and microbial ecology Animals Biological and medical sciences Biological Evolution Body Constitution Demecology Evolution Female Fish Fishes - physiology Food Chain Freshwater Fundamental and applied biological sciences. Psychology Genetics of eukaryotes. Biological and molecular evolution Health risks Humanities and Social Sciences letter Litter Size Longevity - physiology Male Marine ecology Models, Biological Mortality Mortality risk multidisciplinary Natural populations Poecilia reticulata Probability Reproduction - physiology Science Science (multidisciplinary) Survival Rate Swimming Swimming - physiology Time Factors Vertebrata |
| title | Effect of extrinsic mortality on the evolution of senescence in guppies |
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