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2N - Field Studies (MOP/134) Body Distribution and Absorption of Toxic PCDD/Fs and Dioxin-like PCBs in Great Cormorants from Japan. Iseki , Naomasa1, Iizuka, Takashi2, Hayama, Shin_ichi3, Masunaga, Shigeki2, Morita, Masatoshi1, 1 National institute for Environmental Studies, Tsukuba, Ibaraki, Japan2 Yokohama National University, Yokohama, Kanagawa, Japan3 Nippon Veterinary and Animal Science University, Musashino, Tokyo, Japan ABSTRACT- Distribution and absorption of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (DL-PCBs) were measured in 3 individual juvenile great cormorants from Japan. For this context, the administered level was subtracted with the concentration in feces. Prior to beginning of the study, the body weight, administered dose and amount of feces ejected was measured. The absorption of PCDDs, PCDFs and DL-PCBs were estimated from concentration in the feed fish intake by cormorants and feces ejected. The results reveals the absorption averages of PCDD/Fs, except 123789-HxCDF, were in the ranges of approximately 40 to 98%. There are variations among individuals birds and sampling period in case of absorptions, nevertheless, absorption ratio showed a lower tendency depend on much of substituted chlorine of PCDD/Fs. For dioxin-like PCBs, there was high ratio than PCDD/Fs, with approximately 90% excluding PCB-81. In this study, we also conducted tissue distributions of PCDD/Fs and DL-PCBs (e.g., muscle, liver, kidney, fat and blood from raised cormorant. The results comprehended the elevated accumulations of 12378-PeCDD and 23478-PeCDF in the liver than the other body tissues.. Thus, these congeners in the liver have more affinity to the elevated toxic equivalency contribution depending on the accumulated levels. This is the first of its kind of study with great cormorants from Japan. Key words: PCBs, PCDD/Fs, Absorption, Cormorant |
