Evaluation of the combined effect of elevated temperature and cadmium toxicity on Daphnia magna using a simplified DEBtox model. (15th December 2021)

• Record Type: Journal Article
• Authors: Na, Joorim; Kim, Yongeun; Song, Jinyoung; Shim, Taeyong; Cho, Kijong; Jung, Jinho
• Is Part Of: Environmental pollution. Volume 291(2021)
• Publication Date: 2021-12-15
• Subjects: Chronic toxicity -- Daphnid -- Energy budget -- Heavy metal -- Multiple stress; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2021.118250
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Thermal discharge and heatwaves under climate change may increase water temperature. In this study, the individual and combined effect of elevated temperature and cadmium (Cd) toxicity on somatic growth and reproduction of Daphnia magna was evaluated using a simplified dynamic energy budget model (DEBtox). The model predicted that the maximum body length ( L m ) would be shorter (3.705 mm) at an elevated temperature of 25 °C than at 20 °C (3.974 mm), whereas the maximum reproduction rate ( R ˙ m ) would be higher at 25 °C (5.735) than at 20 °C (5.591). The somatic growth and reproduction of D. magna were significantly ( p < 0.05) reduced with increasing Cd concentrations, and the reduction was greater at 25 than at 20 °C. Potentiation of Cd toxicity by elevated temperature was correctly simulated by assuming four toxicological modes of action influencing assimilation, somatic maintenance and growth, and reproduction. Overall, the population growth rate of D. magna was expected to decrease linearly with increasing Cd concentrations, and the decrease was expected to be higher at 25 than at 20 °C. These findings suggest a significant ecological risk of toxic metals at elevated temperature, with a mechanistic interpretation of the potentiation effect using a DEBtox modeling approach. Graphical abstract: Image 1 Highlights: Elevated temperature enhanced chronic toxicity of cadmium in Daphnia magna. This potentiation effect was successfully simulated using a simplified DEBtox model. Four toxicological modes of action were used to simulate cadmium toxicity. Abstract : Capsule: Potentiation of cadmium chronic toxicity on Daphnia magna by elevated temperature was simulated mechanistically using a simplified dynamic energy budget model (DEBtox).