By Joshua Mitteldorf

Because the Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary concept, in particular within the zone of genetics. simultaneously, a technological know-how of multilevel choice has came upon its position within the evolutionary literature. the writer means that proof warrants attention of a brand new paradigm for evolution of getting older, and proposes the demographic idea of senescence, wherein getting older has Read more...

summary: because the Nineteen Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary idea, particularly within the sector of genetics. simultaneously, a technology of multilevel choice has stumbled on its position within the evolutionary literature. the writer means that facts warrants attention of a brand new paradigm for evolution of getting older, and proposes the demographic concept of senescence, wherein getting older has been affirmatively chosen since it degrees the loss of life fee over the years, assisting to stabilize inhabitants dynamics and forestall extinctions

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Additional resources for Aging is a group-selected adaptation: theory, evidence, and medical implications

Example text

In the worms’ case in particular, it may be that post-reproductive elders contribute to a pheromone pool that signals to the next generation about how crowded the environment is and helps them to decide whether to mature now or to dauer. (This is my own speculation. ) A dauer is like a spore, hard and well-protected, resistant to predation, needing no food and hardly any water. Dauers can survive up to six months, waiting for more propitious conditions. Even though most life systems are shut down, the dauer still monitors the environment, sensing and evaluating whether now might be the right time to make its move.

19(2): p. 181-192. 35. A. K. Hellerstein, Alternate-day fasting and chronic disease prevention: a review of human and animal trials. Am. J. Clin. , 2007. 86(1): p. 7-13. 36. P. and D. Albanes, The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. N. Engl. J. , 1994. 330(15): p. 1029-35. 37. , M. Down, and R. Sen, The effects of vitamin E and training on physiological function and athletic performance in adolescent swimmers.

There is reproductive senescence without mortality acceleration and there is mortality acceleration with no reproductive senescence. To call any mode of aging “normal” can only be a product of anthropocentric myopia. Semelparity is one extreme of sudden aging. By definition, semelparous animals reproduce just once and it is striking how quickly and consistently they die once their eggs are laid. We might be tempted to draw a causal connection and infer that it is the reproduction that kills them; except that their modes of death are wildly different: male praying mantises are consumed by their mates, while octopuses starve themselves to death and Pacific salmon poison themselves with steroids.

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