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Selection principles for Gaia.

Rudy Arthur1, Arwen Nicholson2

  • 1Department of Computer Science, University of Exeter, North Park Road, Exeter EX4 4RN, UK.

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|October 28, 2021
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Summary
This summary is machine-generated.

The Gaia hypothesis proposes life regulates Earth's habitability. This study introduces "Entropic Gaia," suggesting co-evolution naturally increases system complexity and resilience over time.

Keywords:
EntropyGaiaSelection by survivalSequential selectionTangled Nature Model

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Area of Science:

  • Earth System Science
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • The Gaia hypothesis posits that life and environment form a coupled system regulating Earth's habitability.
  • Existing Gaia hypotheses lack a unified framework to explain the mechanisms driving this regulation.

Purpose of the Study:

  • To investigate three potential mechanisms for Gaia: Selection by Survival, Sequential Selection, and Entropic Hierarchy.
  • To propose and elaborate on the concept of "Entropic Gaia" as a statistically likely outcome of co-evolution.
  • To explore practical realizations of Gaian memory and testable implications.

Main Methods:

  • Utilizing an extended Tangled Nature Model of co-evolution as a common framework.
  • Investigating Gaia as an example of an entropic hierarchy combining sequential selection and diversity-based memory.
  • Analyzing the implications of increasing biomass, complexity, and habitability.

Main Results:

  • The Tangled Nature Model framework supports the investigation of multiple Gaia mechanisms.
  • An entropic hierarchy model suggests a tendency for growth and increased resilience in the Gaian system.
  • Identified potential mechanisms for Gaian memory: microbial seed banks, climate refugia, and lateral gene transfer.

Conclusions:

  • "Entropic Gaia" offers a novel perspective, viewing increasing biomass, complexity, and habitability as statistically probable features of co-evolving systems.
  • The proposed framework provides testable implications for studying Earth's history and the search for extraterrestrial life.
  • Gaian memory mechanisms offer concrete avenues for empirical investigation.