A Predator-Prey Food-web Model in A Lake

Sharee Brewer


Acid rain decreases the pH level in a lake and the lake acidity has an effect on organisms and can reduce their body size, reproduction capacity, egg viability and mortality rate. In this paper, we developed a predator-prey model consisting of algae (cyanobacteria), Daphnia Magna (a herbivore), and a predator (Yellow Perch) and determined the coefficient functions governing dynamics of growth rate and death rate of organisms with respect to pH value in this model. Parameter values in this model are adopted from experimental data in published references.


Predator-Prey, Algae, Daphnia, Perch, pH, Acid Rain

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