Effect of excess food nutrient on producer-grazer model under stoichiometric and toxicological constraints.
Math Biosci Eng
; 16(1): 150-167, 2018 12 07.
Article
em En
| MEDLINE
| ID: mdl-30674114
ABSTRACT
Accurately assessing the risks of contaminants requires more than an understanding of the effects of contaminants on individual organism, but requires further understanding of complex ecological interactions, elemental cycling, and the interactive effects of natural stressors, such as resource limitations, and contaminant stressors. There is increasing evidence that organisms experience interactive effects of contaminant stressors and food conditions, such as resource stoichiometry, availability and excess of nutrient. Here, we develop and analyze the ï¬rst producer-grazer population model that incorporates the effects of excess nutrients, as well as nutrient limitations on grazer exposed to toxicants. We use analytical, numerical and bifurcation analysis to reduce and exploremodel parameterized for an aquatic system of algae and zooplankton exposed to methylmercury under varying phosphorus conditions. Under certain environmental conditions, our models predict higher toxicity than previous models that neglect the consequences excess nutrient conditions can have on grazer populations.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Zooplâncton
/
Ecossistema
/
Cadeia Alimentar
/
Daphnia
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article