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Ocean acidification increases cadmium accumulation in marine bivalves: a potential threat to seafood safety
Shi, W.; Zhao, X.; Han, Y.; Che, Z.; Chai, X.; Liu, G. (2016). Ocean acidification increases cadmium accumulation in marine bivalves: a potential threat to seafood safety. NPG Scientific Reports 6(20197): 8 pp. http://hdl.handle.net/10.1038/srep20197
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

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Keywords
    Meretrix meretrix (Linnaeus, 1758) [WoRMS]; Mytilus edulis Linnaeus, 1758 [WoRMS]; Tegillarca granosa (Linnaeus, 1758) [WoRMS]; Marine

Authors  Top 
  • Shi, W.
  • Zhao, X.
  • Han, Y.
  • Che, Z.
  • Chai, X.
  • Liu, G.

Abstract
    To date, the effects of ocean acidification on toxic metals accumulation and the underlying molecular mechanism remains unknown in marine bivalve species. In the present study, the effects of the realistic future ocean pCO(2) levels on the cadmium (Cd) accumulation in the gills, mantle and adductor muscles of three bivalve species, Mytilus edulis, Tegillarca granosa, and Meretrix meretrix, were investigated. The results obtained suggested that all species tested accumulated significantly higher Cd (p < 0.05) in the CO2 acidified seawater during the 30 days experiment and the health risk of Cd (based on the estimated target hazard quotients, THQ) via consumption of M. meretrix at pH 7.8 and 7.4 significantly increased 1.21 and 1.32 times respectively, suggesting a potential threat to seafood safety. The ocean acidification-induced increase in Cd accumulation may have occurred due to (i) the ocean acidification increased the concentration of Cd and the Cd2+/Ca2+ in the seawater, which in turn increased the Cd influx through Ca channel; (ii) the acidified seawater may have brought about epithelia damage, resulting in easier Cd penetration; and (iii) ocean acidification hampered Cd exclusion.

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