title: Specific accumulation and temporal trends of organochlorine contaminants in Dall's porpoises (Phocoenoides dalli) from Japanese coastal waters.
abstract: Organochlorine compounds (OCs) such as polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane and its metabolites (DDTs), chlordane related compounds, hexachlorocyclohexane isomers (HCHs), hexachlorobenzene (HCB), tris(4-chlorophenyl) methane (TCPMe) and tris(4-chlorophenyl) methanol were determined in the blubber of Dall's porpoises (Phocoenoides dalli) collected from Japanese coastal waters in 1998/1999. Among OCs analyzed, PCBs were the predominant contaminants with concentrations ranging from 1.5 to 39 microg/g on a wet weight basis. OCs concentrations were relatively low and less variable in mature females possibly due to the lactational excretion from their bodies, while in males the concentrations were increased with body length. Concentrations and compositions of DDTs and HCHs showed significant differences between the truei-type population off the Pacific coast of northern Japan and dalli-type from the Sea of Japan/Okhotsk, suggesting its usefulness to discriminate different populations. OCs levels detected in truei-type porpoises collected in 1998/1999 were lower than those collected in 1984, except TCPMe. On the other hand, except DDTs, the residue levels of other organochlorines in dalli-type porpoises showed no significant decrease since 1984.
authors.affiliation: Center for Marine Environmental Studies, Ehime University, Tarumi 3-5-7, Matsuyama 790-8566, Japan.
authors.forename: Natsuko
authors.initials: N
authors.lastname: Kajiwara
authors.forename: Mafumi
authors.initials: M
authors.lastname: Watanabe
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Tanabe
authors.forename: Ken
authors.initials: K
authors.lastname: Nakamatsu
authors.forename: Masao
authors.initials: M
authors.lastname: Amano
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Miyazaki
mesh_terms: D000818:Animals; D001824:Body Constitution; D004785:Environmental Pollutants / Q000493:pharmacokinetics*; D005260:Female; D007306:Insecticides / Q000493:pharmacokinetics*; D007564:Japan; D007700:Kinetics; D008297:Male; D011078:Polychlorinated Biphenyls / Q000493:pharmacokinetics*; D019576:Porpoises; D012737:Sex Factors; D014018:Tissue Distribution; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*
chemical_list: D004785:Environmental Pollutants; D007306:Insecticides; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls