title: Trophic magnification of polychlorinated biphenyls and polybrominated diphenyl ethers in an estuarine food web of the Ariake Sea, Japan.
abstract: To evaluate trophic biomagnification of polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in an estuary of the Ariake Sea, Japan, we measured concentrations of 209 PCB congeners and 28 PBDE congeners, and nitrogen stable isotope (δ(15)N) levels in living aquatic organisms. The trophic magnification factor (TMF) for ΣPCBs (all 209 congeners) was 1.52, and TMFs for 58 PCB congeners ranged from 0.90 to 3.28. In contrast, TMF for ΣPBDEs was 1.17, and TMFs for 7 PBDE congeners ranged from 0.46 to 1.66. TMFs of PCB and PBDE congeners in this study were lower than those in marine food webs, and were similar to those in a lake food web. However, although negative relationships were observed between TMF and log octanol-water partition coefficient (KOW) values among PCB congeners in this study (log KOW up to 7), positive relationships have been reported in several other studies. In the present estuary, PCB concentrations in sea bass may not reach a steady state because sea bass are migratory species. Therefore, TMFs of highly chlorinated congeners with high log KOW values take longer to reach the steady state and may not increase with increasing log KOW.
authors.affiliation: Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan. Electronic address: jkobayashi@pu-kumamoto.ac.jp.
authors.forename: Jun
authors.initials: J
authors.lastname: Kobayashi
authors.affiliation: Graduate School of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Imuta
authors.affiliation: Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Komorita
authors.affiliation: Seikai National Fisheries Research Institute, 1551-8 Taira-machi, Nagasaki 851-2213, Japan.
authors.forename: Katsumasa
authors.initials: K
authors.lastname: Yamada
authors.affiliation: Shokei University Junior College, 2-6-78 Kuhonji, Kumamoto 862-8678, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ishibashi
authors.affiliation: Graduate School of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Ishihara
authors.affiliation: Graduate School of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Nakashima
authors.affiliation: Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Sakai
authors.affiliation: Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Arizono
authors.affiliation: Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Koga
mesh_terms: D000818:Animals; D058448:Biota; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism; D020387:Food Chain; D005618:Fresh Water / Q000032:analysis; D055768:Halogenated Diphenyl Ethers / Q000032:analysis* / Q000378:metabolism; D007564:Japan; D009587:Nitrogen Isotopes; D009792:Oceans and Seas; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000378:metabolism; D012623:Seawater / Q000032:analysis; D012908:Snails / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D055768:Halogenated Diphenyl Ethers; D009587:Nitrogen Isotopes; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
keywords: Biomagnification; Estuary; Persistent organic pollutants; Stable isotope; Trophic level