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Stoichiometry and food-chain dynamics.

Lothar D J Kuijper1, Bob W Kooi, Thomas R Anderson

  • 1Faculty of Biology, Institute of Ecological Science, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands. kuijper@bio.vu.nl

Theoretical Population Biology
|November 25, 2004
PubMed
Summary

This study introduces a dual-currency chemostat model with carbon and nitrogen, revealing that nutrient recycling can destabilize ecosystems. Dual-element limitation is crucial for understanding phytoplankton and zooplankton dynamics.

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Area of Science:

  • Ecology
  • Systems Biology
  • Biogeochemistry

Background:

  • Traditional chemostat models often use a single currency (e.g., nitrogen) to study predator-prey-nutrient interactions.
  • Real-world ecosystems experience limitations from multiple elements like carbon, nitrogen, phosphorus, and iron.

Purpose of the Study:

  • To develop and analyze a dynamic energy budget model chemostat with both carbon and nitrogen as currencies.
  • To investigate the impact of dual-element availability on phytoplankton growth, trophic transfer to zooplankton, and ecosystem stability.

Main Methods:

  • Development of a dynamic energy budget model chemostat incorporating carbon and nitrogen currencies.
  • Inclusion of two reserve pools per species for metabolic flexibility.
  • Numerical bifurcation analysis to assess model dynamics.

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Main Results:

  • Phytoplankton growth is nitrogen-limited, with nitrogen enrichment potentially causing oscillations and multiple stable states.
  • Nutrient recycling, particularly of mineral nutrients, exhibits a destabilizing effect on the food chain.
  • Both carbon and nitrogen enrichment stimulate zooplankton growth.

Conclusions:

  • The concept of single-element limitation may be insufficient for accurately modeling ecosystem dynamics.
  • Dual-element availability significantly influences phytoplankton-zooplankton interactions and overall ecosystem stability.
  • Metabolic flexibility through reserve pools enhances resilience to changing environmental conditions.