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Bioaccumulation‐based silver nanoparticle toxicity in Daphnia magna and maternal impacts
Author(s) -
Pakrashi Sunandan,
Tan Cheng,
Wang WenXiong
Publication year - 2017
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.3917
Subject(s) - daphnia magna , bioaccumulation , silver nanoparticle , toxicity , daphnia , chemistry , environmental chemistry , ecotoxicity , reproduction , toxicology , cladocera , biology , nanoparticle , zoology , crustacean , ecology , nanotechnology , materials science , organic chemistry
In the present study, we tested whether bioaccumulation in specific tissues of Daphnia magna could explain silver nanoparticle (AgNP) toxicity. Daphnids were exposed to different concentrations of well‐suspended AgNPs and AgNO 3 . The accumulations of Ag in the whole body, gut, and nongut tissues, as well as the mortality of daphnids, were recorded over a period of 7 d. Regression analysis showed a higher degree of positive correlation between the concentration of Ag in the nongut tissues than gut tissues and the mortality of daphnids. The results strongly suggested that the toxicity of AgNPs could be better explained in terms of bioaccumulation of AgNPs in the nongut tissues. We further tested the maternal transfer of AgNPs in daphnids into the next generation using radioactive tracers, which were able to detect as low as 1.0 to 3.2% of total accumulated Ag transferred to the neonates. The AgNPs significantly affected the reproduction process during the first 2 broods after exposure, whereas AgNO 3 only had significant effects on the first brood. It is possible that AgNPs have longer adverse effects than AgNO 3 on the reproduction of Daphnia . The present study identified the sensitive site of AgNP toxic action in daphnids and documented the extent of maternal transfer and the significant influence of AgNPs on the reproduction of daphnids. Environ Toxicol Chem 2017;36:3359–3366. © 2017 SETAC