Single and binary effects of di‐2‐ethylhexyl phthalate and trace metals (Cd, Pb) on life‐history traits ofDaphnia magna

Abstract

In this study, the life trait responses of a model toxicity zooplankton, Daphnia magna, to single di‐2‐ethylhexyl phthalate (DEHP) and its mixture with Pb and Cd at environmentally relevant concentrations (50 µg L–1 for DEHP, 4.2 µg L–1 for Pb, and 5.4 µg L–1 for Cd) were investigated. The DEHP did not impact the survival rate, maturation and reproduction of D. magna. However, in the binary exposures of D. magna to DEHP and the metals, the organisms severely suffered from high mortality proportion, from 70% to 100%. The mixtures of DEHP, Pb, and DEHP with the two metals caused the significant maturation postponement of the D. magna. Besides, mother D. magna exposed to the mixtures of DEHP and metals produced much lower relatives of the accumulative offspring number, from 3.7% to 77.7%, compared to the control. Energy cost would be the root of the impairment. The combined effects of DEHP and metals in the present study help provide more environmentally realistic toxicity of the pollutants than a single one to the freshwater cladoceran D. magna which have been understudied. The results suggest that DEHP should be included in the Vietnam safety guidelines (QCVN) for water monitoring.

Studia i badania nad odzyskiem miedzi z odpadów przemysłowych metodą cementacji

“…Without a doubt -organisms in aquatic environments could be affected by not only a single pollutant but a mixture of pol-lutants as well. The natural water from Mekong River used in present study had some trace elements at low levels (Dao et al accepted manuscript) which might have side effects on D. magna (Le et al 2021). The combined effects of DEHP and trace elements in natural water could cause stronger toxic effects on micro-crustacean than the solely impact of DEHP on the organism in standard medium (Dao et al accepted manuscript).…”

Reakcje mikroskorupiaków, Daphnia magna, w ciągu pięciu pokoleń stale narażonych na działanie ftalanu di-2-etyloheksylu w wodzie rzeki Mekong

“…This needs to be further observed to provide a clear understanding of the characteristics of seasonal variations in heavy metal concentrations. While Tran et al (2020) claimed that the total metal concentrations in the seawater of the Saigon -Dongnai Estuaries were higher during the rainy season than those during the dry season [17]. The of rainfall in the Saigon -Dongnai River Basin in the transition time mobilized both dissolved and particulate metals (Fe, Cr, Ni, and Pb) from the terrestrial environment to the aquatic environment [18].…”