Files used to generate the data for figures in: Rastetter, EB, Kwiatkowski, BL. An approach to modeling resource optimization for substitutable and interdependent resources. Ecological Modelling (2020). https://doi.org/10.1016/j.ecolmodel.2020.109033. This paper presents a hierarchical approach to modeling organism acclimation to changing availability of and requirements for substitutable and interdependent resources. Substitutable resources are resources that fill the same metabolic or stoichiometric need of the organism. Interdependent resources are resources whose acquisition or expenditure are tightly linked (e.g., light, carbon dioxide, and water in photosynthesis and associated transpiration). We illustrate the approach by simulating the development of vegetation with four substitutable sources of nitrogen that differ only in the cost of their uptake and assimilation.
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We build two models based on mass-balance differential equations. The differential equations are solved numerically with a 4th/5th order Runge-Kutta integrator with adapting time steps to optimize precision and computation time. The models are coded in Lazarus 2.0.4 (2019) Free Pascal. Input to the models are all parameter values, initial values for all state variables, and values for all driver variables for all time steps. Outputs from the models are all state and process variables for each time step. See Rastetter, EB, Kwiatkowski, BL. An approach to modeling resource optimization for substitutable and interdependent resources. Ecological Modelling (2020). https://doi.org/10.1016/j.ecolmodel.2020.109033 for detailed methods.
Version 2: Update keywords. BK 17Feb22