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Birth-order differences can drive natural selection on aging.

Duncan O S Gillespie1, Meredith V Trotter, Siddharth Krishna-Kumar

  • 1Department of Biology, Stanford University, Stanford, California, 94305; Department of Public Health and Policy, University of Liverpool, Liverpool, L69 3GB, United Kingdom. d.gillespie@liverpool.ac.uk.

Evolution; International Journal of Organic Evolution
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Summary
This summary is machine-generated.

Senescence, the aging process, evolves faster when sibling inequality creates detrimental environments for later-born offspring. This occurs in species like humans where family dynamics impact reproduction.

Keywords:
Ecologydemographyevolutioninequalityinheritancelife history

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Population ecology

Background:

  • Senescence, or aging, is traditionally linked to declining natural selection with age.
  • Observed variations in aging rates suggest ecological factors influence selection's weakening.
  • Parental age, birth order, and environment may mediate selection on senescence in species with repeated reproduction.

Purpose of the Study:

  • To investigate how sibling environmental inequality affects the evolution of senescence.
  • To explore the role of birth-order related environmental differences in parental age-specific selection.
  • To model the impact of family dynamics on aging rates.

Main Methods:

  • Utilized an age-and-stage structured population model.
  • Simulated scenarios of sibling environmental inequality.
  • Analyzed the relationship between birth order, parental age, and offspring reproductive success.

Main Results:

  • Accelerated senescence evolves when later-born siblings face detrimental environments.
  • Sibling environmental inequality can significantly alter selection pressures on aging.
  • The study highlights the importance of family interactions and resource inheritance in shaping senescence.

Conclusions:

  • Sibling environmental inequality is a crucial factor in the evolution of senescence.
  • Species with complex family structures, like humans, may exhibit pronounced effects.
  • Understanding these dynamics offers new insights into aging across diverse species.