Journal Title
Title of Journal: Arch Environ Contam Toxicol
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Abbravation: Archives of Environmental Contamination and Toxicology
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Authors: Tamzin A Blewett Chris M Wood
Publish Date: 2014/12/27
Volume: 68, Issue: 2, Pages: 382-394
Abstract
The mechanisms of nickel Ni toxicity in marine fish remain unclear although evidence from freshwater FW fish suggests that Ni can act as a prooxidant This study investigated the oxidative stress effects of Ni on the euryhaline killifish Fundulus heteroclitus as a function of salinity Killifish were exposed to sublethal levels 5 10 and 20 mg L−1 of waterborne Ni for 96 h in FW 0 ppt and 100 saltwater SW 35 ppt In general SW was protective against both Ni accumulation and indicators of oxidative stress protein carbonyl formation and catalase CAT activity This effect was most pronounced at the highest Ni exposure level For example FW intestine showed increased Ni accumulation relative to SW intestine at 20 mg Ni L−1 and this was accompanied by significantly greater protein carbonylation and CAT activity in this tissue There were exceptions however in that although liver of FW killifish at the highest exposure concentration showed greater Ni accumulation relative to SW liver levels of CAT activity were greatly decreased This may relate to tissue and salinityspecific differences in oxidative stress responses The results of the present study suggest 1 that there was Niinduced oxidative stress in killifish 2 that the effects of salinity depend on differences in the physiology of the fish in FW versus SW and 3 that increased levels of cations sodium calcium potassium and magnesium and anions SO4 and Cl in SW are likely protective against Ni accumulation in tissues exposed to the aquatic environmentThis research was supported by two NSERC CRD Grants awarded to Scott Smith and C M W principal investigators with cofunding from the International Zinc Association the International Lead Zinc Research Organization the Nickel Producers Environmental Research Association the International Copper Association the Copper Development Association Teck Resources and Vale Inco Thanks to Joe Gorsuch Chris Schlekat Mike Taylor and the industrial partners for their helpful comments on the draft version of the manuscript
Keywords:
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