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首页> 外文学位 >Relating trophic structure to mercury distribution in a Gulf of St. Lawrence food web: From zooplankton to colonial seabirds using stable nitrogen and carbon isotope analysis.
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Relating trophic structure to mercury distribution in a Gulf of St. Lawrence food web: From zooplankton to colonial seabirds using stable nitrogen and carbon isotope analysis.

机译：将营养结构与圣劳伦斯湾食物网中的汞分布相关：使用稳定的氮和碳同位素分析，从浮游动物到殖民地海鸟。

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摘要

Even at very low concentrations in the environment, mercury (Hg) has the potential to biomagnify in food chains reaching levels of concern in apex predators such as fish-eating seabirds. The aim of this study was to determine the trophic structure and the transfer of total mercury (THg) and methylmercury (MeHg) in a Gulf of St. Lawrence food web using stable nitrogen (delta 15N) and carbon (delta13C) isotope analysis. Since food is the main exposure route to Hg in organisms, I wanted to characterize and compare the diet of top level predator seabirds using traditional and novel techniques. I found that body weight, trophic level and lipid content of organisms were the best predictors of THg and MeHg in this food web. Although the influence of habitat on the overall Hg distribution in the food web was low, I was able to demonstrate an effect within taxonomical groups which indicates that sediments are a source of THg and MeHg in this ecosystem. Several organisms at the base of the food chain were above the MeHg threshold level for the protection of wildlife suggesting a potential threat for upper trophic level predators. Diet composition of seabirds determined using traditional and novel techniques led to similar and complementary results illustrating that these methods can be combined for future studies to monitor prey availability and to predict the exposure of consumers to Hg.
机译：即使在环境中浓度很低的情况下，汞（Hg）也有可能在食物链中被生物放大，达到诸如食鱼海鸟等先天性捕食者所关注的水平。这项研究的目的是使用稳定的氮（δ15N）和碳（δ13C）同位素分析法确定圣劳伦斯湾食物网的营养结构和总汞（THg）和甲基汞（MeHg）的转移。由于食物是生物体内汞暴露的主要途径，因此我想用传统和新颖的技术来表征和比较顶级捕食海鸟的饮食。我发现，在该食物网中，生物的体重，营养水平和脂质含量是THg和MeHg的最佳预测指标。尽管栖息地对食物网中总Hg分布的影响很小，但我能够证明在分类学组内的影响，这表明沉积物是该生态系统中THg和MeHg的来源。食物链底部的几种生物高于保护野生生物的甲基汞阈值水平，这表明对高营养水平的天敌有潜在的威胁。使用传统和新颖技术确定的海鸟的饮食组成导致相似和互补的结果，说明可以将这些方法结合起来用于未来的研究，以监测猎物的可利用性并预测消费者对汞的接触。

著录项

  • 作者

    Lavoie, Raphael A.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Health Sciences Toxicology.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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