By Joshua Mitteldorf
Because the Nineteen Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary conception, in particular within the region of genetics. at the same time, a technological know-how of multilevel choice has discovered 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 demise fee over the years, supporting to stabilize inhabitants dynamics and stop extinctions. 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 technological know-how of multilevel choice has came across 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 thought of senescence, wherein getting older has been affirmatively chosen since it degrees the loss of life expense over the years, assisting to stabilize inhabitants dynamics and forestall extinctions
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Extra resources for Aging is a group-selected adaptation: theory, evidence, and medical implications
12 Aging is a Group-Selected Adaptation Can Life Extension from CR be Reconciled with Accepted Evolutionary Theories? There are ideas in the literature that would purport to explain CR within the context of traditional evolutionary theory, but none has been fully explored or set forth in detail. Harrison and Archer  were the first out of the starting gate, with a theory that extension of lifespan was an artifact of the breeding of laboratory rodents. ) They focus appropriately on the huge advantage available to an animal that can survive through a famine and reproduce in the period of thin competition that follows.
But it poses particular difficulty for theories of aging from oxidative damage, since exercise increases oxidative stress and increases lifespan. Exercise is most demanding on mitochondria. It induces mitochondrial oxidative damage and promotes mitochondrial autophagy. According 16 Aging is a Group-Selected Adaptation to the popular mitochondrial free radical theory , exercise ought to accelerate aging and antioxidants should offer some mitigation, but the truth is the opposite. It has been common knowledge for at least many decades that exercise benefits almost every aspect of health and lowers mortality, especially for diseases of old age.
Theory proclaims that there is no such thing as genetically programmed death; it is an evolutionary oxymoron. But in the case of semelparity, some of the most orthodox evolutionary theorists will admit an exception . Pansies and other annuals familiar from domestic gardens will flower once for the year, then the buds “go to seed” and the plant dies. Does death result from the effort of making the flower? No! In fact, snipping off the flower gives the plant a new lease on life. Pansies can be made to bloom continuously through the summer, 26 Aging is a Group-Selected Adaptation if their flowers are snipped before they go to seed.