Genotypic Selection in Spatially Heterogeneous Producer-Grazer Systems Subject to Stoichiometric Constraints

Chandani Dissanayake, Lourdes Juan, Kevin R. Long, Angela Peace, Md Masud Rana

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Various environmental conditions may exert selection pressures leading to adaptation of stoichiometrically important traits, such as organismal nutritional content or growth rate. We use theoretical approaches to explore the connections between genotypic selection and ecological stoichiometry in spatially heterogeneous environments. We present models of a producer and two grazing genotypes with different stoichiometric phosphorus/carbon ratios under spatially homogenous and heterogeneous conditions. Numerical experiments predict that selection of a single genotype, co-persistence of both genotypes, and extinction are possible outcomes depending on environmental conditions. Our results indicated that in spatially homogenous settings, co-persistence of both genotypes can occur when population dynamics oscillate on limit cycles near a key stoichiometric threshold on food quality. Under spatially heterogeneous settings, dynamics are more complex, where co-persistence is observed on limit cycles, as well as stable equilibria.

Original languageEnglish
Pages (from-to)4726-4742
Number of pages17
JournalBulletin of Mathematical Biology
Issue number11
StatePublished - Nov 1 2019


  • Diffusion
  • Ecological stoichiometry
  • Genotypic selection
  • Population dynamics


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