title: Biomagnification profiles of polycyclic aromatic hydrocarbons, alkylphenols and polychlorinated biphenyls in Tokyo Bay elucidated by delta13C and delta15N isotope ratios as guides to trophic web structure.
abstract: Biomagnification profiles of polycyclic aromatic hydrocarbons (PAHs), alkylphenols, and polychlorinated biphenyls (PCBs) from the innermost part of Tokyo Bay, Japan were analyzed using stable carbon (delta(13)C) and nitrogen (delta(15)N) isotope ratios as guides to trophic web structure. delta(15)N analysis indicated that all species of mollusks tested were primary consumers, while decapods and fish were secondary consumers. Higher concentrations of PCBs occurred in decapods and fish than in mollusks. In contrast, concentrations of PAHs and alkylphenols were lower in decapods and fish than in mollusks. Unlike PCBs, whose concentrations largely increased with increasing delta(15)N (i.e. increasing trophic level), all PAHs and alkylphenols analyzed followed a reverse trend. Molecular weights of PAHs are lower than those of PCBs, therefore low membrane permeability caused by large molecular size is an unlikely factor in the "biodilution" of PAHs. Organisms at higher trophic levels may rapidly metabolize PAHs or they may assimilate less of them.
authors.affiliation: Department of Life Environment Conservation, Faculty of Agriculture, Ehime University, Tarumi, Matsuyama, Ehime 790-8566, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takeuchi
authors.forename: Noriko
authors.initials: N
authors.lastname: Miyoshi
authors.forename: Kaoruko
authors.initials: K
authors.lastname: Mizukawa
authors.forename: Hideshige
authors.initials: H
authors.lastname: Takada
authors.forename: Tokutaka
authors.initials: T
authors.lastname: Ikemoto
authors.forename: Koji
authors.initials: K
authors.lastname: Omori
authors.forename: Kotaro
authors.initials: K
authors.lastname: Tsuchiya
mesh_terms: D000818:Animals; D002247:Carbon Isotopes / Q000032:analysis*; D033364:Decapoda / Q000737:chemistry / Q000378:metabolism; D004784:Environmental Monitoring; D020387:Food Chain; D007564:Japan; D016014:Linear Models; D008974:Mollusca / Q000737:chemistry / Q000378:metabolism; D009132:Muscles / Q000737:chemistry; D009587:Nitrogen Isotopes / Q000032:analysis*; D009792:Oceans and Seas; D010473:Perciformes / Q000378:metabolism; D010636:Phenols / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D012623:Seawater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D010636:Phenols; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls