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首页> 外文期刊>Environmental Science & Technology >Differences in Mercury Bioaccumulation between Polar Bears {Ursus maritimus) from the Canadian high- and sub-Arctic
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Differences in Mercury Bioaccumulation between Polar Bears {Ursus maritimus) from the Canadian high- and sub-Arctic

机译：加拿大高北极和亚北极北极熊（Ursus maritimus）之间汞生物富集的差异

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摘要

Polar bears (Ursus maritimus) are being impacted by climate change and increased exposure to pollutants throughout their northern circum-polar range. In this study, we quantified concentrations of total mercury (THg) in the hair of polar bears from Canadian high- (southern Beaufort Sea, SBS) and sub- (western Hudson Bay, WHB) Arctic populations. Concentrations of THg in polar bears from the SBS population (14.8 ± 6.6 fie g l) were significantly higher than in polar bears from WHB (4.1 ± 1.0 fie g ). On the basis of <5'^I signatures in hair, in conjunction with published 6 N signatures in particulate organic matter and sediments, we estimated that the pelagic and benthic food webs in the SBS are ~4.7 and ~4.0 trophic levels long, whereas in WHB they are only ~3.6 and ~3.3 trophic levels long. Furthermore, the more depleted <513C ratios in hair from SBS polar bears relative to those from WHB suggests that SBS polar bears feed on food webs that are relatively more pelagic (and longer), whereas polar bears from WHB feed on those that are relatively more benthic (and shorter). Food web length and structure accounted for ~67% of the variation we found in THg concentrations among all polar bears across both populations. The regional difference in polar bear hair THg concentrations was also likely due to regional differences in water-column concentrations of methyl Hg (the toxic form of Hg that biomagnines through food webs) available for bioaccumulation at the base of the food webs. For example, concentrations of methylated Hg at mid-depths in the marine water column of the northern Canadian Arctic Archipelago were 79.8 ± 37.3 pg L~', whereas, in HB, they averaged only 38.3 ± 16.6 pg IT'. We conclude that a longer food web and higher pelagic concentrations of methylated Hg available to initiate bioaccumulation in the BS resulted in higher concentrations of THg in polar bears from the SBS region compared to those inhabiting the western coast of HB.
机译：北极熊（Ursus maritimus）受到气候变化的影响，并且在整个北极北极范围内都越来越多地接触污染物。在这项研究中，我们量化了来自加拿大北极高地（南博福特海，SBS）和亚北极地区（西哈德逊湾，WHB）的北极熊的头发中总汞（THg）的浓度。来自SBS种群的北极熊中THg的浓度（14.8±6.6 fie g l）显着高于来自WHB的北极熊中的THg（4.1±1.0 fie g）。根据头发中<5'^ I的特征，再加上颗粒有机物和沉积物中已发布的6 N特征，我们估计SBS中的浮游和底栖食物网的营养水平约为〜4.7和〜4.0。在WHB中，它们的营养水平只有〜3.6和〜3.3。此外，SBS北极熊的毛发相对于WHB的毛发<513C比率更贫乏，这表明SBS北极熊以食物的腹膜上皮（和更长）为食，而WHB的北极熊则以相对较多的食物皮为食。底栖（和更短）。食物网的长度和结构占我们在两个种群中所有北极熊中THg浓度变化的〜67％。北极熊毛THg浓度的区域差异也可能是由于水柱中甲基Hg（可通过食物网产生的镁的毒性形式）的水柱浓度存在区域差异，可通过食物网的基础进行生物蓄积。例如，加拿大北部北极群岛海洋水柱中深度处甲基化汞的浓度为79.8±37.3 pg L〜'，而在HB中，它们的平均值仅为38.3±16.6 pg IT'。我们得出的结论是，与居住在HB西海岸的动物相比，更长的食物网和可用于在BS中引发生物蓄积的中上层甲基化汞的中上层浓度更高，导致来自SBS地区的北极熊中THg的浓度更高。

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  • 来源
    《Environmental Science & Technology》 |2011年第14期|p.5922-5928|共7页
  • 作者

    Vincent L. St Louis; Andrew E. Derocher; Ian Stirling; Jennifer A Graydon; Caroline Lee; Erinjocksch; Evan Richardson; Sarah Ghorpade; Alvin K. Kwan; Jane L. Kirk; Igor Lehnherr; Heidi K. Swanson;

  • 作者单位

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Canadian Wildlife Services, Environment Canada, 5320-122 Street, Edmonton, Alberta Canada T6H 3SS;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Canadian Wildlife Services, Environment Canada, 5320-122 Street, Edmonton, Alberta Canada T6H 3SS;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Canadian Centre for Inland Waters, Environment Canada, Burlington, Ontario Canada L7R 4A6;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta Canada T6G 2E9;

  • 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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