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Contaminants in western Canadian arctic ringed seals (Phoca hispida): Temporal variation and potential effects of a warming climate.

机译:加拿大西部北极圈海豹(Phoca hispida)中的污染物:时间变化和气候变暖的潜在影响。

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摘要

I reviewed contaminant levels in ringed seals (Phoca hispida ) from the western Canadian Arctic (Ulukhaktok, NT Canada) along with biological (age, sex, morphometric measurements), ecological (delta 15N, delta13C), and sea ice parameters (mercury only). Mercury levels in muscle tissue increased with age and delta15N. Muscle mercury was significantly associated to length of the previous ice-free season (quadratic regression) between 1973--2007. Higher mercury concentrations as a result of short (i.e. two months) and long (i.e. five months) ice-free seasons may reflect particular environmental conditions leading to shifts in the composition and distribution of prey available to ringed seals.;Temporal trends of organochlorine contaminants in blubber illustrated general decreasing levels of chlorobenzenes, hexachlorocyclohexanes, chlordanes, chlorobornanes, dichlorodiphenyl-trichloroethanes and polychlorinated biphenyls in male and female adult ringed seals. Results parallel contaminant trends in Arctic air. Organochlorine contaminants were significantly higher in male adults compared to female adults. Blubber thickness and age were also important variables in determining concentrations.
机译:我回顾了加拿大西部北极圈(加拿大北卡罗来纳州乌鲁卡克托克)的环形海豹(海豹)中的污染物水平,以及生物学(年龄,性别,形态计量学),生态学(δ15N,delta13C)和海冰参数(仅含汞) 。肌肉组织中的汞水平随年龄和δ15N的增加而增加。 1973--2007年间,肌肉汞与上一个无冰季节的长度(二次回归)显着相关。由于无冰期短(即两个月)和长(即五个月)而导致的较高的汞浓度可能反映了特殊的环境条件,导致可用于环形海豹的猎物的组成和分布发生了变化。;有机氯污染物的时间趋势在润滑脂中,示出了成年和成年环状海豹中氯苯,六氯环己烷,氯丹,氯硼烷,二氯二苯基-三氯乙烷和多氯联苯的总体含量下降。在北极空气中产生平行的污染物趋势。男性成年人中的有机氯污染物明显高于女性成年人。橡胶的厚度和使用年限也是确定浓度的重要变量。

著录项

  • 作者

    Gade, Ashley.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Biology Ecology.;Environmental Sciences.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 74 p.
  • 总页数 74
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学(生物生态学);环境科学基础理论;
  • 关键词

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