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Alternative Method of Removing Otoliths from Sturgeon
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Alternative mechanisms for Gaia.

Arwen E Nicholson1, David M Wilkinson2, Hywel T P Williams1

  • 1Earth System Science, University of Exeter, Streatham Campus, Exeter EX4 4PY, UK.

Journal of Theoretical Biology
|August 28, 2018
PubMed
Summary
This summary is machine-generated.

Life

Keywords:
FeedbackGaia hypothesisRegulation mechanismsSelection by survivalSelf regulation

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Area of Science:

  • Astrobiology
  • Earth System Science
  • Theoretical Ecology

Background:

  • The Gaia hypothesis proposes life regulates Earth's environment.
  • A key objection is the lack of plausible regulatory mechanisms.
  • Alternative: life persists due to chance and the anthropic principle.

Purpose of the Study:

  • To investigate if 'selection by survival alone' can enhance biosphere persistence.
  • To model the impact of environmental feedback on life's persistence probability.

Main Methods:

  • Developed a quantitative model simulating biosphere persistence.
  • Incorporated 'selection by survival alone' and environmental feedback mechanisms.

Main Results:

  • Selection by survival alone increases a biosphere's future persistence probability compared to pure chance.
  • Environmental feedback's effect is conditional: it can increase or decrease survival based on initial conditions.
  • Feedback may hinder early life but can stabilize conditions for established life.

Conclusions:

  • Quantitative modeling supports that 'selection by survival alone' can enhance biosphere persistence.
  • Environmental feedback presents a complex, condition-dependent influence on life's long-term survival.
  • Further research is needed to determine the relative importance of these mechanisms in Earth's history.