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首页> 外文期刊>Environmental toxicology and chemistry >MERCURY SPECIATION AND BIOMAGNIFICATION IN THE FOOD WEB OF CADDO LAKE,TEXAS AND LOUISIANA, USA, A SUBTROPICAL FRESHWATER ECOSYSTEM
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MERCURY SPECIATION AND BIOMAGNIFICATION IN THE FOOD WEB OF CADDO LAKE,TEXAS AND LOUISIANA, USA, A SUBTROPICAL FRESHWATER ECOSYSTEM

机译：亚热带淡水生态系统美国得克萨斯州和路易斯安那州加多湖的食物网中的汞特异性和生物放大作用

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摘要

We studied the biomagnification of total mercury and methylmercury in a subtropical freshwater lake, Caddo Lake, Texas and Louisiana, USA. The present study is unique in that it not only included invertebrates (seven species) and fish (six species) but also an amphibian (one species), reptiles (three species), and mammals (three species). Nonfish vertebrates such as those included in the present study are often not included in assessments of trophic transfer of Hg. Mean trophic position (determined using stable isotopes of nitrogen) ranged from 2.0 (indicative of a primary consumer) to 3.8 (indicative of a tertiary consumer). Mean total Hg concentrations ranged from 36 to 3,292 ng/g dry weight in muscle and whole body and from 150 to 30,171 ng/g dry weight in liver. Most of the Hg in muscle and whole-body tissue was found as methylmercury, and at least 50% of the Hg found in liver was in the inorganic form (with the exception of largemouth bass, Micropterus salmoides). Mercury concentrations were positively correlated with trophic position, indicating that biomagnification occurs in the food web of Caddo Lake. The food web magnification factors (FWMFs; slope of the relationship between mean Hg concentration and trophic position) for both total Hg and methylmercury were similar to those observed in other studies. Because most of the total Hg in consumers was methylmercury, the FWMF for methylmercury was not significantly different from the FWMF for total Hg. Some vertebrates examined in the present study had low Hg concentrations in their tissues similar to those observed in invertebrates, whereas others had concentrations of Hg in their tissues that in previous studies have been associated with negative health consequences in fish. Environ. Toxicol. Chem. 2011;30:1153-1162.
机译：我们研究了亚热带淡水湖（德克萨斯州卡多湖和美国路易斯安那州）中总汞和甲基汞的生物放大倍数。本研究的独特之处在于它不仅包括无脊椎动物（七个物种）和鱼类（六个物种），而且还包括两栖动物（一个物种），爬行动物（三个物种）和哺乳动物（三个物种）。汞营养转移的评估通常不包括非鱼类脊椎动物，例如本研究中包括的那些。平均营养位置（由稳定的氮同位素确定）范围为2.0（表示主要消费者）至3.8（表示第三级消费者）。肌肉和全身的平均总Hg浓度为36至3,292 ng / g干重，肝脏中为150至30,171 ng / g干重。肌肉和全身组织中的大多数汞均以甲基汞的形式存在，肝脏中至少有50％的汞以无机形式存在（大嘴鲈，沙门氏菌除外）。汞浓度与营养位置呈正相关，表明生物放大作用发生在卡多湖的食物网中。总Hg和甲基汞的食物网放大系数（FWMF；平均Hg浓度与营养位置之间关系的斜率）与其他研究中观察到的相似。由于消费者中的汞总量中的大部分为甲基汞，因此甲基汞的FWMF与总汞的FWMF差异不大。在本研究中检查的某些脊椎动物的组织中Hg浓度较低，与在无脊椎动物中观察到的相似，而其他脊椎动物的组织中Hg浓度先前在研究中对鱼类的健康产生负面影响。环境。毒药。化学2011; 30：1153-1162。

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  • 来源
    《Environmental toxicology and chemistry》 |2011年第5期|p.1153-1162|共10页
  • 作者

    Matthew M. Chumchal; Thomas R. Rainwater; Steven C. OSBORN; Aaron P. Roberts; Michael T. Abel; George P. Cobb; Philip N. Smith; Frank C. Bailey;

  • 作者单位

    Biology Department, Texas Christian University, Fort Worth, Texas, USA;

    Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas, USA;

    Biology Department, Texas Christian University, Fort Worth, Texas, USA;

    Department of Biological Sciences, University of North Texas, Denton, Texas, USA;

    Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas, USA;

    Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas, USA;

    Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas, USA;

    Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee, USA;

  • 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

    mercury; stable isotopes; vertebrates; invertebrates; biomagnification;

    机译：汞;稳定同位素;脊椎动物;无脊椎动物;生物放大;

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