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首页> 外文期刊>Environmental Science & Technology >Size and Biomagnification: How Habitat Selection Explains Beluga Mercury Levels
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Size and Biomagnification: How Habitat Selection Explains Beluga Mercury Levels

机译:大小和生物放大倍数:生境选择如何解释白鲸的汞含量

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摘要

Mercury (Hg) levels inthe Beaufort Sea beluga (Delphinapterus leucas) population increased during the 1990s; levels have since declined but remain higher than the 1980s. The diet of this beluga population is not well-known, thus it is difficult to assess dietary Hg sources. During the summer, the Beaufort Sea belugas segregate by length, sex, and reproductive status corresponding to habitat use that may result in feeding differences and ultimately Hg uptake. To test this hypothesis, we examine beluga dietary variation using fatty acid profiles and determine which biological variables best predict diet. Relationships between biological variables and fatty acids were further evaluated with stable isotopes and Hg concentrations in liver and muscle. Hg concentrations in muscle were better related to liver δ~(15)N than muscle δ~(15)N. Stable isotopes and fatty acids are compared in their ability to describe dietary Hg processes in beluga. Fatty acids provided support for influences of whale behavior on dietary Hg uptake, whereas stable isotopes inferred tissue Hg metabolic rates. Here, we show beluga length drives diet variability leading to differences in Hg uptake and biomagnification processes dominate beluga Hg levels over Hg bioaccumulation over time.
机译:在1990年代,波弗特海白鲸(Delphinapterus leucas)种群中的汞(Hg)含量增加。此后水平有所下降,但仍高于1980年代。这种白鲸种群的饮食尚不为人所知,因此很难评估饮食中的汞来源。在夏季,波弗特海白鲸在长度,性别和繁殖状况上与栖息地使用相对应,可能导致觅食差异并最终吸收汞。为了验证这一假设,我们使用脂肪酸谱检查了白鲸的饮食差异,并确定了哪些生物变量最能预测饮食。用肝脏和肌肉中稳定的同位素和汞浓度进一步评估了生物学变量与脂肪酸之间的关系。肌肉中的Hg浓度与肝脏δ〜(15)N的相关性更好。比较了稳定同位素和脂肪酸描述白鲸饮食中汞过程的能力。脂肪酸为鲸鱼行为对饮食中汞摄取的影响提供了支持,而稳定的同位素推断组织汞的代谢率。在这里,我们显示白蛋白的长度驱动饮食变化,导致汞吸收的差异,而生物放大过程随时间推移而超过了生物积累的汞,从而主导了白蛋白的汞水平。

著录项

  • 来源
    《Environmental Science & Technology》 |2008年第11期|p.3982-3988|共7页
  • 作者单位

    Department of Zoology, University of Manitoba, Winnipeg MB, R3T 2N2, Canada, Univeristy of Victoria, 501 University Cres., Winnipeg MB, R3T2N6, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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