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Title: RIBE at an inter-organismic level: a study on genotoxic effects in Daphnia magna exposed to waterborne uranium and a uranium mine effluent
Author: Reis, P.
Lourenço, J.
Carvalho, F. P.
Oliveira, J.
Malta, M.
Mendo, S.
Pereira, R.
Keywords: Bystander effect
Daphnia magna
Uranium mine effluent
Environmental risk assessment
Issue Date: May-2018
Publisher: Elsevier
Abstract: The induction of RIBE (Radiation Induced Bystander Effect) is a non-target effect of low radiation doses that has already been verified at an inter-organismic level in fish and small mammals. Although the theoretical impact in the field of environmental risk assessment (ERA) is possible, there is a gap of knowledge regarding this phenomenon in invertebrate groups and following environmentally relevant exposures. To understand if RIBE should be considered for ERA of radionuclide-rich wastewaters, we exposed Daphnia magna (<24 h and 5d old) to a 2% diluted uranium mine effluent for 48 h, and to a matching dose of waterborne uranium (55.3 μg L-1). Then the exposed organisms were placed (24 and 48 h) in a clean medium together with non-exposed neonates. The DNA damage observed for the non-exposed organisms was statistically significant after the 24 h cohabitation for both uranium (neonates p = 0.002; 5 d-old daphnids p = <0.001) and uranium mine effluent exposure (only for neonates p = 0.042). After 48 h cohabitation significant results were obtained only for uranium exposure (neonates p = 0.017; 5 d-old daphnids p = 0.013). Although there may be some variability associated to age and exposure duration, the significant DNA damage detected in non-exposed organisms clearly reveals the occurrence of RIBE in D. magna. The data obtained and here presented are a valuable contribution for the discussion about the relevance of RIBE for environmental risk assessment.
Peer review: yes
DOI: 10.1016/j.aquatox.2018.03.007
ISSN: 0166-445X
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