title: The Daphnia magna role to predict the cadmium toxicity of sediment: Bioaccumlation and biomarker response.
abstract: To evaluate Daphnia magna role to predict the Cd toxicity in contaminated sediment, the Cd accumulation, metallothionein (MT), and mortality of D. magna exposed to overlying water system or water-sediment coexistence system were measured. The mortality, Cd accumulation, and MT in D. magna increased with the increasing Cd content in sediment. The Cd accumulation and MT in D. magna exposed to the coexistence system were significantly higher than those exposed to the overlying water system because of the ingestion of Cd-containing sediments by D. magna. However, the mortality did not significantly differ in the two systems, suggesting that mortality was less sensitive than accumulation and MT. The Cd accumulation/MT index can explain why the two systems had the similar mortality but different Cd accumulation and MT. Not all the percentage composition of nonresidual fractions (e.g., exchangeable, carbonate bound, and organic bound phases) significantly correlated with the difference values of Cd accumulation and MT, as well as Cd accumulation/MT. However, these indexes increased with the percentage composition of the nonresidual fractions, indicating that the distribution of Cd chemical fractions is crucial for its bioavailability and biotoxicity.
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Weihua
authors.initials: W
authors.lastname: Peng
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Duan
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Jinqian
authors.initials: J
authors.lastname: Ren
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Space and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, PR China. Electronic address: fanwh@buaa.edu.cn.
authors.forename: Wenhong
authors.initials: W
authors.lastname: Fan
mesh_terms: D000818:Animals; D001682:Biological Availability; D015415:Biomarkers / Q000378:metabolism; D002104:Cadmium / Q000378:metabolism / Q000633:toxicity*; D003621:Daphnia / Q000378:metabolism*; D019015:Geologic Sediments; D008668:Metallothionein / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*
chemical_list: D015415:Biomarkers; D014874:Water Pollutants, Chemical; D002104:Cadmium; D008668:Metallothionein
keywords: Biotoxicity; Cadmium; Chemical fraction; Daphnia magna; Sediment