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Extrinsic Mortality Can Shape Life-History Traits, Including Senescence.

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|November 22, 2018
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Summary
This summary is machine-generated.

Williams' hypothesis predicts faster senescence with higher adult mortality. This study resolves theoretical conflicts by re-deriving fitness gradients, showing the hypothesis holds true in broader ecological contexts with density dependence.

Keywords:
Density-dependenceFitness measuresMalthusian parameterNet reproductive rateReproductive valueResource allocationSelection gradientsWilliams hypothesisr/K selection

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Area of Science:

  • Life history evolution
  • Evolutionary biology
  • Ecological modeling

Background:

  • The Williams' hypothesis, a cornerstone in life history evolution, posits a direct link between adult mortality rates and the pace of senescence.
  • Theoretical models and empirical data have presented conflicting evidence regarding the validity of Williams' hypothesis.
  • This discrepancy has led to significant confusion and debate among evolutionary theorists and ecologists.

Purpose of the Study:

  • To address the crisis of misinformation surrounding Williams' hypothesis.
  • To re-examine the theoretical underpinnings of the relationship between mortality and senescence.
  • To identify the specific ecological conditions under which Williams' hypothesis is supported.

Main Methods:

  • Critically analyzing the measurement of fitness in theoretical models.
  • Investigating the assumptions and impact of density dependence on life history traits.
  • Re-deriving theoretical fitness gradients incorporating realistic ecological factors, including density dependence and appropriate fitness measures.

Main Results:

  • Classic theoretical gradients supporting Williams' hypothesis are shown to be applicable only under limited ecological conditions (e.g., absence of density dependence).
  • Incorporating density dependence and using a more appropriate measure of fitness reveals that Williams' hypothesis is supported across a wider range of ecological contexts.
  • The study demonstrates that the relationship between adult mortality and senescence is more nuanced than previously modeled.

Conclusions:

  • The perceived conflict with Williams' hypothesis stems from oversimplified theoretical models and inappropriate fitness measures.
  • When ecological factors like density dependence are appropriately incorporated, Williams' hypothesis is robust and broadly applicable.
  • This work reconciles theoretical predictions with empirical observations, clarifying the conditions under which increased adult mortality drives faster senescence.