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An ecological model for Lake Ontario model formulation, calibration, and preliminary evaluation
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1976
[PDF-58.63 MB]
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Description:A simulation model describing the dynamics of four types of phytoplankton, six types of zooplankton, detritus, organic nitrogen, ammonia, nitrate, available phosphorus, the carbonate system, and benthic invertebrates has been developed for the Lake Ontario ecosystem. The equations are described. The ecological model is driven by a physical model designed to predict average temperature, segment thicknesses, and vertical diffusion coefficients for the three-layer model. v In addition, an orginal formulation for calculating sedimentation rates is shown to accurately predict community settling rates. The simulated processes and predicted variables follow ecologically realistic patterns and compare favorably to measured parameters in Lake Ontario. Sensitivity analyses revealed that modeled phosphorus was quite responsive to changes in diffusion, sedimentation was critical to predicting benthic dynamics, and self-shading by phytoplankton was not critical due to the relationship between light limitation and phosphorus depletion. Changes in temperature resulted in predicted shifts in the peaks of the phytoplankton and zooplankton, and the sensitivity of the model to fish predation indicated the need for better descriptions of fish dynamics.
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Rights Information:CC0 Public Domain
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