Bioconcentration and biomagnification of polybrominated diphenyl ethers (PBDEs) through lower-trophic-level coastal marine food web.
Bivalves, crabs, fishes, seawater, and sediment collected from the inner part of Tokyo Bay, Japan, were measured for 20 polybrominated diphenyl ether (PBDE) and 5 polychlorinated biphenyl (PCB) congeners. To determine the trophic levels of the organisms, carbon and nitrogen stable isotope ratios (delta(13)C and delta(15)N) were also measured. Bioconcentration factors of PBDE and PCB congeners increased as the octanol-water partition coefficient (K(ow)) rose to log K(ow)=7, above which they decreased again. Biomagnification of PCBs and several PBDE congeners (BDE47, 99, 100, 153 and 154) up the trophic ladder was confirmed by a positive correlation between their concentrations and delta(15)N. Other PBDE congeners showed a negative or no correlation, suggesting their biotransformation through metabolism. The more hydrophobic congeners of both PBDEs (Br=2-6) and PCBs (Cl=6-9) were biomagnified more. It thus appears that PBDEs are less biomagnified than PCBs.
Laboratory of Organic Geochemistry, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
Kaoruko
K
Mizukawa
Laboratory of Organic Geochemistry, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan. Electronic address: shige@cc.tuat.ac.jp.
Hideshige
H
Takada
Department of Life Environment Conservation, Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
Ichiro
I
Takeuchi
Department of Life Environment Conservation, Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
Tokutaka
T
Ikemoto
Center for Marine Environmental Studies, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
Koji
K
Omori
Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan 4-5-7, Minato-ku, Tokyo 108-8477, Japan.
Kotaro
K
Tsuchiya
D000818:Animals; D020387:Food Chain; D055768:Halogenated Diphenyl Ethers / Q000032:analysis / Q000378:metabolism*; D007564:Japan; D008386:Marine Biology; D010140:Pacific Ocean; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
D055768:Halogenated Diphenyl Ethers; D014874:Water Pollutants, Chemical