A simple DEB-based ecosystem model.

Area of Science:

• Ecology
• Theoretical Biology
• Biogeochemistry

Background:

• Ecosystem modeling requires integrating complex biological processes with nutrient cycling.
• Dynamic Energy Budget (DEB) theory provides a framework for understanding organismal energy acquisition and allocation.
• Previous models often lack detailed stoichiometric carbon and nitrogen integration across trophic levels.

Purpose of the Study:

• To present a minimal stoichiometric carbon and nitrogen model of an entire ecosystem based on Dynamic Energy Budget (DEB) theory.
• To describe the structure and components of the proposed ecosystem model, including nutrients, producers, consumers, decomposers, and detritus.
• To detail the application of DEB V1-morphs and synthesizing units within the ecosystem model.

Main Methods:

• Development of a minimum stoichiometric carbon and nitrogen model.
• Integration of Dynamic Energy Budget (DEB) theory for organismal energetics.
• Modeling of seven state variables for living matter (somatic structure and reserve compartments) and four detritus types.
• Utilizing DEB V1-morphs, where surface area is proportional to volume, simplifying size structure dynamics.

Main Results:

• The model successfully integrates carbon and nitrogen dynamics within a closed ecosystem.
• The dynamics of carbon dioxide and ammonium are derived from the model's state variables.
• First results of system dynamics are presented, demonstrating the model's capability.

Conclusions:

• The presented DEB V1-morph model offers a simplified yet comprehensive approach to ecosystem modeling.
• This framework facilitates the study of stoichiometric carbon and nitrogen cycling across different ecosystem components.
• The model provides a foundation for further research into ecosystem dynamics and theoretical biology.