Mechanistically derived Toxicant-mediated predator-prey model under Stoichiometric constraints

Md Nazmul Hassan, Angela Peace

Research output: Contribution to journalArticlepeer-review


Studies in ecological stoichiometry highlight that grazer dynamics are affected by insufficient food nutrient content (low phosphorus (P)/carbon (C) ratio) as well as excess food nutrient content (high P:C). Contaminant stressors affect all levels of the biological hierarchy, from cells to organs to organisms to populations to entire ecosystems. Eco-toxicological modeling under the framework of ecological stoichiometry predicts the risk of bio-accumulation of a toxicant under stoichiometric constraints. In this paper, we developed and analyzed a Lotka - Volterra type predator - prey model which explicitly tracks the environmental toxicant as well as the toxicant in the populations under stoichiometric constraints. Analytic, numerical, slow-fast steady state and bifurcation theory are employed to predict the risk of toxicant bio-accumulation under varying food conditions. In some cases, our model predicts different population dynamics, including wide amplitude limit cycles where producer densities exhibit very low values and may be in danger of stochastic extinction.

Original languageEnglish
Pages (from-to)349-365
Number of pages17
JournalMathematical Biosciences and Engineering
Issue number1
StatePublished - 2020


  • Ecological stoichiometry
  • Ecotoxicology
  • Predator - prey model


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