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Effects of salinity and copper co-exposure on copper bioaccumulation in marine rabbitfish Siganus oramin
Zhou, YY; Zhang, W; Guo, ZQ; Zhang, L; zhangli@scsio.ac.cn
2017
Source PublicationCHEMOSPHERE
Volume168Pages:491-500
AbstractMarine fish living in estuaries and coastal areas commonly encounter the stress of both salinity and metal pollution. In this study, euryhaline rabbitfish Siganus oramitt were exposed to 50 mu g L-1 waterborne Cu or 300 mu g g(-1) dry wt dietary Cu at salinity 33 parts per thousand, 25 parts per thousand, 20 parts per thousand, 10 parts per thousand, and 5 parts per thousand for 30 days. The Cu accumulation in the liver (>20-fold increase) and intestine (>5-fold increase) significantly increased after either waterborne or dietary Cu acclimation. Moreover, Cu accumulation was further enhanced in the liver, intestine, plasma, and whole body of Cu-exposed fish at lower salinities. Similarly, the waterborne Cu uptake rate constants (k(u)s) were stable in the control at different salinities but increased significantly (2-4 times higher) after waterborne Cu exposure. Conversely, the dietary Cu assimilation efficiencies (AEs) were significantly lower in the dietary Cu-exposed fish (3-5%) than in the control fish (8-16%) at different salinities, suggesting that dietary Cu acclimation partially alleviated the dietary Cu uptake from the high-Cu diet. The Cu efflux rate constants (Ices) were comparable among all treatments as 0.060 -0.071 d(-1). The changes of Cu accumulation by different salinities and Cu exposure were well estimated by the biokinetic modeling. In summary, the present study indicates that rabbitfish can regulate Cu uptake and accumulation when acclimated to different salinities, but the Cu-exposed rabbitfish failed to prevent the elevation of Cu accumulation at low salinities. It therefore suggested that the concurrence of low salinity and high Cu exposure enhances the risks of Cu bioaccumulation and toxicity in rabbitfish. (C) 2016 Elsevier Ltd. All rights reserved.
Department[Zhou, Yanyan; Zhang, Wei; Guo, Zhiqiang; Zhang, Li] Chinese Acad Sci, Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Zhou, Yanyan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
KeywordCopper Fish Bioaccumulation Salinity Dietary Uptake Biokinetic Modeling
Funding ProjectLMB
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/16232
Collection中科院海洋生物资源可持续利用重点实验室
Corresponding Authorzhangli@scsio.ac.cn
Recommended Citation
GB/T 7714
Zhou, YY,Zhang, W,Guo, ZQ,et al. Effects of salinity and copper co-exposure on copper bioaccumulation in marine rabbitfish Siganus oramin[J]. CHEMOSPHERE,2017,168:491-500.
APA Zhou, YY,Zhang, W,Guo, ZQ,Zhang, L,&zhangli@scsio.ac.cn.(2017).Effects of salinity and copper co-exposure on copper bioaccumulation in marine rabbitfish Siganus oramin.CHEMOSPHERE,168,491-500.
MLA Zhou, YY,et al."Effects of salinity and copper co-exposure on copper bioaccumulation in marine rabbitfish Siganus oramin".CHEMOSPHERE 168(2017):491-500.
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