Organochlorine pesticide accumulation in seabirds and marine mammals from the Northwest Pacific

Abstract Bioaccumulation of organochlorine pesticides by marine organisms is one of the methods of environmental quality. Concentrations of organochlorine pesticides (HCH isomers (α-, β-, γ-HCH), p , p ′-DDT and its metabolites ( p , p ′-DDD, p , p ′-DDE)) in samples of seabirds (Northern fulmar Fulmarus glacialis , Crested auklet Aethia cristatella , Auklet-crumb Aethia pusilla , Pacific gull Larus schistisagus , and Gray petrel Oceanodroma furcate ) and marine mammals (Gray whales Eschrichtius robustus and Pacific walrus Odobenus rosmarus divergens ) were measured by a GC–MS. The total concentration of OCPs in mammals was higher than in seabirds. Environmental biomonitoring with the use of seabirds and marine mammals, as a long-lived species, is used for global monitoring, since bioaccumulation in these organisms occurs throughout life. The environmental assessment of the Northwest Pacific marine ecosystems revealed that the levels of OCP contamination in this area are similar to the other subarctic regions of the World Ocean.