Long-term dynamical behavior of a mechanistically-based DEB ecosystem model resembles that of the Rosenzweig–MacArthur model

A simplified version of an ecosystem model that was entirely based on Dynamic Energy Budget (DEB) theory is presented. The simplified model only considers producers, consumers, and a single nutrient. Environmental forcings are total nutrient content in the system, and light and temperature, which may or may not vary seasonally. The simplification allows for a detailed analysis of the long-term model dynamics by means of bifurcation analysis, exploring variation in forcing and parameter values. The model shares key dynamical characteristics with the Rosenzweig–MacArthur model, including the emergence of the paradox of enrichment. Higher total nutrient content in the system destabilizes the equilibrium. Yet, the DEB model, which is based on first principles such as area-volume relationships and rules of mass conservation, makes a more mechanistic interpretation of the link between environmental forcing and parameter values and dynamical model behavior possible. It also revealed that, in contrast to nutrient level, higher light irradiation revealed a stabilizing effect. • A simplified version of an ecosystem model entirely based on DEB theory is constructed. • A detailed analysis was performed of the long-term model dynamics by means of bifurcation analysis. • The dynamical behavior of the model resembles that of the Rosenzweig–MacArthur model. • The model predicted the emergence of the paradox of enrichment: More nutrients destabilize. • In contrast to nutrient level, higher light irradiation revealed a stabilizing effect.