Contamination of Deep-Sea Organisms from Tosa Bay, Japan by Organochlorine and Butyltin Compounds
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概要
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Organochlorine (OCs) and butyltin (BTs) residues were determined in deep-sea and shallow water organisms collected from Tosa Bay, Japan. Among OCs, concentrations of PCBs (polychlorinated biphenyls) and DDTs (DDTs and its metabolites) were the highest in deep-sea organisms (maximum concentrations of 1600ng/g and 1200ng/g lipid wt, respectively). CHLs (chlordane compounds) were the next most abundant OCs, and HCHs (hexachlorocyclohexanes) and HCB (hexachlorobenzen) were the lowest. The maximum concentration of total butyltin (ΣBTs=MBT+DBT+TBT) in deep-sea organisms was 39ng/g wet wt. Concentrations of PCBs, CHLs and BTs in deep-sea organisms from Tosa Bay were significantly lower than those from Suruga Bay, Japan. Among the organisms, echinoderms showed the lowest concentrations of almost all the contaminants analyzed, while carnivorous fishes accumulated some higher molecular weight OCs and BTs at high concentrations. The residue pattern of OCs and BTs showed a specific trend according to the habitats of fishes. The concentrations of OCs were lower in pelagic species than benthic fishes, suggesting that higher molecular weight OCs tend to deposit in sediment resulting in exposure of benthic biota. Concentrations of PCBs and CHLs were higher in the fishes from coastal waters, while those of HCHs and HCB were accumulated in the fishes from offshore deep waters at higher concentrations. These patterns of OCs may be influenced by the local sources of PCBs and CHLs in coastal regions and high mobility of HCHs and HCB. In contrast to OCs, relatively higher concentraions of BTs were found in pelagic fishes from coastal shallow waters than the benthic species, suggesting a continuous input of these compounds into the surface water. The compositions of OCs in deep-sea organisms showed a higher ratio of p, p'-DDE, trans-nonachlor and β-HCH. Whereas TBT (tributyltin) as a parent compound of BT was predominant in deep-sea organisms, indicating a fresh input of TBT into the deep-sea ecosystem.
- 国立科学博物館の論文
- 2001-03-30
著者
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TANABE Shinsuke
Center for Marine Environmental Studies (CMES), Ehime University
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Tanabe Shinsuke
Center For Marine Environmental Studies (cmes) Ehime University
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Tanabe S
Center For Marine Environmental Studies Ehime University
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Takahashi Shin
Center for Marine Environmental Studies, Ehime University
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Kubodera Tsunemi
Department of Zoology, National Science Museum
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Hayashi Saori
Center for Marine Environmental Studies, Ehime University
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Kasai Rie
Center for Marine Environmental Studies, Ehime University
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Kubodera Tsunemi
Department Of Zoology National Science Museum
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Kasai Rie
Center For Marine Environmental Studies Ehime University
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Hayashi Saori
Center For Marine Environmental Studies Ehime University
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Takahashi Shin
Center For Marine Environmental Studies Ehime University
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