...
首页> 外文期刊>Environmental toxicology and chemistry >INFLUENCE OF CARBON AND LIPID SOURCES ON VARIATION OF MERCURY AND OTHER TRACE ELEMENTS IN POLAR BEARS (URSUS MARITIMUS)
【24h】

INFLUENCE OF CARBON AND LIPID SOURCES ON VARIATION OF MERCURY AND OTHER TRACE ELEMENTS IN POLAR BEARS (URSUS MARITIMUS)

机译:碳脂来源对北极熊体内汞和其他微量元素变化的影响

获取原文
获取原文并翻译 | 示例
           

摘要

In the present study, the authors investigated the influence of carbon and lipid sources on regional differences in liver trace element (As, Cd, Cu, total Hg, Mn, Pb, Rb, Se, and Zn) concentrations measured in polar bears (Ursus maritimus) (n= 121) from 10 Alaskan, Canadian Arctic, and East Greenland subpopulations. Carbon and lipid sources were assessed using δ~(13)C in muscle tissue and fatty acid (FA) profiles in subcutaneous adipose tissue as chemical tracers. A negative relationship between total Hg and δ~(13)C suggested that polar bears feeding in areas with higher riverine inputs of terrestrial carbon accumulate more Hg than bears feeding in areas with lower freshwater input. Mercury concentrations were also positively related to the FA 20: In-9, which is biosynthesized in large amounts in Calanus copepods. This result raises the hypothesis that Calanus glacialis are an important link in the uptake of Hg in the marine food web and ultimately in polar bears. Unadjusted total Hg, Se, and As concentrations showed greater geographical variation among polar bear subpopulations compared with concentrations adjusted for carbon and lipid sources. The Hg concentrations adjusted for carbon and lipid sources in Bering-Chukchi Sea polar bear liver tissue remained the lowest among subpopulations. Based on these findings, the authors suggest that carbon and lipid sources for polar bears should be taken into account when one is assessing spatial and temporal trends of long-range transported trace elements.
机译:在本研究中,作者调查了碳和脂质来源对北极熊(熊熊)中肝脏微量元素(砷,镉,铜,总汞,锰,铅,铅,硒和锌)浓度区域差异的影响。 maritimus)(n = 121)来自10个阿拉斯加,加拿大北极和东格陵兰亚群。使用肌肉组织中的δ〜(13)C和皮下脂肪组织中的脂肪酸(FA)谱作为化学示踪剂评估碳和脂质来源。总汞与δ〜(13)C之间的负相关关系表明,在河床碳输入量较高的地区喂养北极熊比在淡水输入量较低的地区喂养北极熊累积更多的汞。汞浓度也与FA 20:In-9呈正相关,FA 20:In-9是在Calanus pe足类动物中大量生物合成的。这一结果提出了这样的假说,即冰河蟹是海洋食物网中以及最终在北极熊中摄取汞的重要环节。与针对碳和脂质来源调整的浓度相比,未经调整的总Hg,Se和As浓度显示出北极熊亚群之间更大的地理差异。在白令楚科奇海北极熊肝脏组织中,根据碳和脂质来源调整的Hg浓度在亚人群中仍然最低。基于这些发现,作者建议,当人们评估远程运输的微量元素的时空趋势时,应考虑北极熊的碳和脂质来源。

著录项

  • 来源
    《Environmental toxicology and chemistry》 |2012年第12期|2739-2747|共9页
  • 作者单位

    Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, Ontario,Norwegian Polar Institute, Fram Centre, Troms0, Norway;

    Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, Ontario;

    Greenland Institute of Natural Resources, Nuuk, Greenland;

    Department of Environment and Natural Resources, Government of the Northwest Territories, Inuvik, Northwest Territories, Canada;

    Department of Bioscience, Faculty of Science and Technology, Aarhus University, Roskilde, Denmark;

    United States Fish and Wildlife Service, Anchorage, Alaska;

    Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, Ontario;

    Department of Environment, Government of Nunavut, Igloolik, Nunavut, Canada;

    Department of Bioscience, Faculty of Science and Technology, Aarhus University, Roskilde, Denmark;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polar bear; mercury; trace elements; spatial trends; carbon and lipid sources;

    机译:北极熊;汞;微量元素;空间趋势;碳和脂质来源;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号