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首页> 外文期刊>Environmental toxicology and chemistry >BIOACCUMULATION AND MATERNAL TRANSFER OF MERCURY AND SELENIUM IN AMPHIBIANS
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BIOACCUMULATION AND MATERNAL TRANSFER OF MERCURY AND SELENIUM IN AMPHIBIANS

机译：两栖动物中汞和硒的生物富集和物质转移

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摘要

Amphibian population declines have been documented worldwide and environmental contaminants are believed to contribute to some declines. Maternal transfer of bioaccumulated contaminants to offspring may be an important and overlooked mechanism of impaired reproductive success that affects amphibian populations. Mercury (Hg) is of particular concern due to its ubiquity in the environment, known toxicity to other wildlife, and complex relationships with other elements, such as selenium (Se). The objectives of the present study were to describe the relationships between total Hg (THg), methlymercury (MMHg), and Se in three amphibian species (Plethodon cinereus, Eurycea bislineata cirrigera, and Bufo americanus) along a Hg-polluted river and floodplain, and to determine if B. americanus maternally transfers Hg and Se to its eggs in a tissue residue-dependent manner. Total Hg and MMHg concentrations in all species spanned two orders of magnitude between the reference and contaminated areas, while Se concentrations were generally low in all species at both sites. Strong positive relationships between THg and MMHg in tissues of all species were observed throughout. Both Hg and Se were maternally transferred from females to eggs in B. americanus, but the percentage of the females' Hg body burden transferred to eggs was low compared with Se. In addition, Hg concentrations appeared to positively influence the amount of Se transferred from female to eggs. The present study is the first to confirm a correlation between Hg concentrations in female carcass and eggs in amphibians and among the first to describe co-transference of Se and Hg in an anamniotic vertebrate. The results suggest future work is needed to determine whether maternal transfer of Hg has transgenerational implications for amphibian progeny.
机译：世界各地都有两栖动物种群减少的记录，据信环境污染物造成了某些数量的减少。母体将生物积累的污染物母体转移给后代可能是影响两栖动物种群的生殖成功受损的重要且被忽视的机制。汞（Hg）在环境中无处不在，已知对其他野生生物具有毒性以及与其他元素（例如硒（Se））的复杂关系特别受关注。本研究的目的是描述受Hg污染的河流和洪泛区中三种两栖动物（Plethodon cinereus，Eurycea bislineata cirrigera和Bufo americanus）的两栖动物中总Hg（THg），甲基汞（MMHg）和Se之间的关系，并确定美洲双歧杆菌是否以组织残基依赖性方式将Hg和Se母本转移至其卵中。在参考区域和受污染区域之间，所有物种的总Hg和MMHg浓度跨两个数量级，而在这两个地点，所有物种中的Se浓度通常较低。整个过程中，在所有物种的组织中均观察到THg和MMHg之间的强正相关。汞和硒都是从母体中转移到美洲鸡蛋中的卵中，但是与硒相比，雌性中汞转移到卵中的身体负担百分比较低。另外，汞的浓度似乎对从雌性转移到卵中的硒含量有积极影响。本研究是第一个证实两栖动物的car体和卵中Hg浓度之间相关性的研究，也是第一个描述羊水脊椎动物中Se和Hg共同转移的研究。结果表明，未来的工作需要确定汞的母体转移是否对两栖动物后代具有跨代影响。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第4期|p.989-997|共9页
  • 作者

    Christine M. Bergeron; Catherine M. Bodinof; Jason M. Unrine; William A. Hopkins;

  • 作者单位

    Wildlife Ecotoxicology and Physiological Ecology Program, Department of Fisheries and Wildlife Sciences,Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA;

    Wildlife Ecotoxicology and Physiological Ecology Program, Department of Fisheries and Wildlife Sciences,Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA;

    Department of Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky 40546, USA;

    Wildlife Ecotoxicology and Physiological Ecology Program, Department of Fisheries and Wildlife Sciences,Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, 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

    amphibians mercury; methylmercury; selenium; maternal transfer;

    机译：两栖类汞;甲基汞硒;产妇转移;

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