Category Archives: The Plateau

Thesis 33

Thesis #33 – When late-adult plateaus in survival and reproduction occur, members of biological cohorts that reach such plateaus will show stabilization of some but not necessarily all functional characters. Evolutionary theory makes a simple prediction about how the key … Continue reading

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Thesis 35

Thesis #35 – The ages at which the forces of natural selection plateau depend on the last ages of reproduction and survival in the evolutionary history of a population, allowing experimental evolution of the cessation of aging by deliberately changing … Continue reading

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Thesis 37

Thesis #37 – Patterns of aging, including the rates of decline of functional characters and the timing of any cessation in such decline, depend on the environments in which cohorts are raised and live as adults. (Picture of Einstein talking … Continue reading

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Thesis 45

Thesis #45 – Our ancestral hunter-gatherer populations had generally low population densities, and thus low effective population sizes, which produced relatively early cessation of aging at relatively high function due to genetic drift. With very low population densities among our … Continue reading

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Thesis 46

Thesis #46 – In the last ten to twenty thousand years, some human populations adopted extensive agricultural cultivation of grass species and the use of milk from other mammals for nutrition, a novel environment which changed the action of natural … Continue reading

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Thesis 48

Thesis #48 – Agricultural populations have also undergone substantial increases in population size compared to those of their ancestral hunter-gatherer populations, which increased the effectiveness of natural selection at later adult ages, resulting in the evolution of a delay in … Continue reading

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Thesis 49

Thesis #49 – In agricultural populations over the last ten thousand years, the longer-sustained effectiveness of natural selection has resulted in an age-dependent pattern of falling adaptation to agricultural conditions in which functional decline is sustained over a longer period … Continue reading

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