Download Aging is a group-selected adaptation: theory, evidence, and by Joshua Mitteldorf PDF

By Joshua Mitteldorf

Because the Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary concept, specially within the quarter of genetics. simultaneously, a technology of multilevel choice has chanced 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 Read more...

summary: because the Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary concept, specifically within the region of genetics. at the same time, a technology of multilevel choice has came across 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 been affirmatively chosen since it degrees the demise expense through the years, aiding to stabilize inhabitants dynamics and stop extinctions

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

Example text

But in the standard paradigm of individual selection, relatively more reproduction implies a competitive advantage regardless of any notion of absolute sufficiency of offspring. In the standard paradigm, population is held steady from one generation to the next by intense competition for resources. More offspring means more tickets in the lottery for a fixed number of places in the niche. There is no notion of “enough offspring” within standard thinking about individual competition; there can be no such thing as “enough tickets” for you so long as your neighbor has more.

Acta Physiol. , 1997. 161(3): p. 379-384. 39. , The effect of coenzyme Q 10 on the exercise performance of crosscountry skiers. Mol. , 1997. 18: p. 283-290. 40. , Coenzyme Q10 supplementation and exercise-induced oxidative stress in humans. Nutrition, 2012. 28(4): p. 403-417. 41. K. J. Jackson, Exercise-induced oxidative stress: cellular mechanisms and impact on muscle force production. Physiol. , 2008. 88(4): p. 1243-1276. 42. , Antioxidants prevent health-promoting effects of physical exercise in humans.

Animals lengthen their lifespans under duress. This attests to the fact that, under most conditions, the metabolism is evolved not to live as long as possible. A more provocative and enlightening definition of hormesis is the converse: animals are evolved to shorten their lifespans in the absence of stress. This can only have a communal adaptive function, because the impact of shortened lifespan on individual fitness is always negative. The benefit is to promote demographic stability, to help maintain the homeostasis of ecosystems by leveling the death rate.

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