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首页> 外文期刊>Environmental Science & Technology >Western Canadian Arctic Ringed Seal Organic Contaminant Trends in Relation to Sea ice Break-Up
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Western Canadian Arctic Ringed Seal Organic Contaminant Trends in Relation to Sea ice Break-Up

机译：加拿大西部北极圈海豹与海冰分解的有机污染物趋势

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摘要

The association between changing sea ice conditions and contaminant exposure to Arctic animals interests Inuvialuit harvesters, communities, and researchers. We examined organochlorine contaminant (OC) concentrations in the blubber of 90 male adult ringed seals (Phoca hispida) sampled from the subsistence harvest in Ulukhaktok (formerly Holman), NT, Canada, just prior to break-up of the sea ice (1993-2008). OC blubber concentrations were assessed with respect to year and sea ice break-up date. HCB and age- and blubber-adjusted concentrations of p,p'-DDT and ∑CHB (chlorobornane) significantly decreased over the study period. With respect to the timing of the spring break-up, highly lipophlic Ocs, such as p,p'-DDE and PCB 153, were higher during years of early ice clearing (at least 12 days earlier than the mean annual break-up date), whereas no trends were observed for α, β, and γ isomers of HCH, tram- and cis-chlordane, oxychlordane, or ∑CHB. The higher contaminant concentrations found in earlier break-up years is likely due to earlier and/or increased foraging opportunities. This situation also has potential for enhancing bioaccumulation and biomagnification of contaminants over the long-term if projected changes continue to result in lighter and earlier ice conditions.
机译：海冰条件的变化与北极动物污染物的暴露之间的联系使Inuvialuit收割者，社区和研究人员倍感兴趣。我们在海冰破裂前（1993年至2008）。关于年和海冰分解日期，评估了OC润滑脂的浓度。在研究期间，HCB以及经年龄和油脂调节的p，p'-DDT和∑CHB（氯冰片）浓度显着降低。关于春季解体的时间，在早期结冰的年份（至少比平均年解体时间至少提前12天），较高的脂类Ocs（例如p，p'-DDE和PCB 153）更高），而没有观察到六氯环己烷，有轨和顺式氯丹，氧氯丹或∑CHB的α，β和γ异构体的趋势。在较早的分解年中发现的较高的污染物浓度可能是由于较早的和/或增加的觅食机会。如果预计的变化继续导致更轻和更早的冰雪条件，这种情况还可能长期提高污染物的生物累积和生物放大率。

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  • 来源
    《Environmental Science & Technology》 |2012年第8期|p.4427-4433|共7页
  • 作者

    A. Gaden; Steve H. Ferguson; L. Harwood; H. Melling; J. Alikamik; G. A. Stern;

  • 作者单位

    Department of Environment and Geography, University of Manitoba, 500 University Crescent, Winnipeg MB, R3T 2N2, Canada;

    Department of Environment and Geography, University of Manitoba, 500 University Crescent, Winnipeg MB, R3T 2N2, Canada,Fisheries and Oceans Canada, 501 University Crescent, Winnipeg MB, R3T 2N6, Canada;

    Fisheries and Oceans Canada, Yellowknife, Northwest Territories, X1A 1E2, Canada;

    Fisheries and Oceans Canada, Sidney, British Columbia, V8K 4B2, Canada;

    Olokhatomiut Hunters and Trappers Committee, Ulukhaktok, Northwest Territories, XOE 0S0, Canada;

    Department of Environment and Geography, University of Manitoba, 500 University Crescent, Winnipeg MB, R3T 2N2, Canada,Fisheries and Oceans Canada, 501 University Crescent, Winnipeg MB, R3T 2N6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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