Levels and patterns of PCBs and OC pesticides in harbour and grey seals from the St Lawrence Estuary, Canada

被引:44
作者
Bernt, KE
Hammill, MO
Lebeuf, M
Kovacs, KM
机构
[1] Univ Waterloo, Waterloo, ON N2L 3G1, Canada
[2] Inst Maurice Lamontagne, Dept Fisheries & Oceans, Mont Joli, PQ G5H 3Z4, Canada
[3] Norwegian Polar Res Inst, N-9296 Tromso, Norway
基金
加拿大自然科学与工程研究理事会;
关键词
PCBs; organochlorine pesticides; marine mammals; pinnipeds; St Lawrence Estuary; Canada;
D O I
10.1016/S0048-9697(99)00400-3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Blubber samples from harbour (Phoca vitulina) and grey seals (Halichoerus grypus) captured in the St Lawrence Estuary were analysed for PCBs and OC pesticides. Concentrations of Sigma PCB, Sigma DDT, Sigma CHLOR and mirex were higher in harbour than in grey seals, while Sigma HCH and HCB were similar in the two species. Age vs. concentration plots showed that Sigma PCB, Sigma DDT and Sigma CHLOR concentrations increased with age in males, but plateaued at sexual maturity in females. Concentrations of Sigma HCH decreased and mirex increased with age for post-weaning animals, regardless of gender. HCB did not show age-related trends. PCB congener and OC pesticide patterns varied within harbour seals (based on gender and maturity) and between harbour and grey seals. PCB and OC concentrations in harbour seals were lower than those seen in a sample of significantly older beluga whales. Both species remain in the Estuary year-round. PCB and OC pesticide concentrations were higher in resident harbour seals than in either grey or harp seals that visit the Estuary seasonally. PCB and OC pesticide concentrations in harbour seals from the Estuary were generally higher than in harbour seals from other regions of North America. They were comparable to, or higher than those from the NE Atlantic Ocean and the North Sea, and lower than those from the Wadden and Baltic Seas. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:243 / 262
页数:20
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