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Related Experiment Videos

Ecosystem growth and development.

Brian D Fath1, Sven E Jørgensen, Bernard C Patten

  • 1Biology Department, Towson University, Towson, MD 21252, USA. bfath@towson.edu

Bio Systems
|November 6, 2004
PubMed
Summary

Ecosystems maintain order through thermodynamic processes during succession. Maximizing energy flow and exergy storage are key drivers of ecosystem growth and development across all stages.

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Area of Science:

  • Thermodynamics
  • Ecology
  • Systems Biology

Background:

  • Biosystems maintain internal order (low entropy) using thermodynamic principles.
  • Ecosystem organization is trackable via thermodynamic parameters during succession.
  • Ecosystem growth involves increased energy and biomass; development is internal reorganization.

Purpose of the Study:

  • To refine understanding of thermodynamic orientors during ecosystem succession.
  • To examine five proposed thermodynamic hypotheses during different succession stages.
  • To identify universal thermodynamic drivers of ecosystem growth and development.

Main Methods:

  • Observation of thermodynamic orientors across four ecosystem succession stages: boundary, structural, network, and informational.
  • Analysis of five hypotheses: minimize specific entropy production, maximize dissipation, maximize exergy storage, maximize energy throughflow, and maximize retention time.
  • Utilizing empirical data and theoretical models to support findings.

Main Results:

  • All five thermodynamic orientors were observed to some degree during succession.
  • Maximizing energy throughflow and maximizing exergy storage were applicable across all four succession stages.
  • Other orientors applied only during specific stages of ecosystem development.

Conclusions:

  • Ecosystem succession is characterized by movement away from thermodynamic equilibrium, increasing organization.
  • Maximizing energy throughflow and exergy storage are the primary thermodynamic drivers of ecosystem growth and development.
  • These processes are facilitated by system components and configurations that enhance useful energy flux and stored exergy.

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