Trends in organochlorine residue concentrations and burdens in grey seals (Halichoerus grypus) from Sable Is., NS, Canada, between 1974 and 1994 |
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Authors: | Addison R F Stobo W T |
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Institution: | DFO Institute of Ocean Sciences, PO Box 6000, Sidney BC, Canada V8L 4B2. addisonr@dfo-mpo.gc.ca |
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Abstract: | In blubber from maternal grey seals (Halichoerus grypus) from Sable Is., NS, sigma DDT (p,p'-DDE and p,p'-DDT) concentrations declined from 12 micrograms/g lipid in 1974 to 0.5 microgram/g in 1994. Pup blubber sigma DDT concentrations were about 60% of those of their mothers, and declined at similar rates. In maternal seals, p,p'-DDE increased from 56% sigma DDT in 1974 to 89% in 1994. Polychlorinated biphenyl concentrations did not change between 1976 and 1988, but then declined; the relative proportion of chlorobiphenyl (CB) 101 increased, and those of CBs 170 and 187 decreased between 1985 and 1991. Concentrations of alpha-hexachlorocyclohexane and trans-nonachlor declined after 1988, and of oxychlordane after 1992; concentrations of hexachlorobenzene were constant between 1984 and 1994. |
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