Modeling the direct and indirect effects of copper on phytoplankton-zooplankton interactions

Aquatic Toxicology
Loïc ProsnierF D Hulot

Abstract

Predicting the effects of pollution at the community level is difficult because of the complex impacts of ecosystem dynamics and properties. To predict the effects of copper on a plant-herbivore interaction in a freshwater ecosystem, we built a model that focuses on the interaction between an alga, Scenedesmus sp., and a herbivore, Daphnia sp. The model assumes logistic growth for Scenedesmus and a type II functional response for Daphnia. Internal copper concentrations in Scenedesmus and Daphnia are calculated using a biodynamic model. We include two types of direct effects of copper on Scenedesmus and Daphnia that results from hormesis: a deficiency effect at low concentration and a toxic effect at high concentration. We perform a numerical analysis to predict the combined effects of copper and nutrient enrichment on the Scenedesmus-Daphnia interaction. Results show three types of outcomes depending on copper concentration. First, low (4 μg L(-1)) and high (50 μg L(-1)) copper concentrations cause deficiency and toxicity, respectively, leading to the extinction of all populations; for less extreme concentrations (between 4 and 5 μg L(-1) and between 16.5 and 50 μg L(-1)), only the consumer population becomes extinct. The two p...Continue Reading

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Citations

Oct 28, 2016·Integrated Environmental Assessment and Management·Ryan W Stevenson, Peter M Chapman
Feb 15, 2020·Global Biogeochemical Cycles·Camille Richon, Alessandro Tagliabue
Aug 18, 2020·Toxicon : Official Journal of the International Society on Toxinology·Qing CaoLiuyan Yang

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