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The effects of wastewater effluent on a fish and amphibian species.

机译：废水对鱼类和两栖类物种的影响。

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摘要

Wastewater effluents have been shown to contain a variety of anthropogenic compounds, many of which have endocrine-disrupting properties. While multiple laboratory studies have shown the effects of such compounds on an individual basis at elevated concentrations, little research has attempted to characterize the effects of exposure to environmentally relevant mixtures of endocrine disruptors. The current study examined the effects of long-term exposure to graded concentrations of wastewater effluent on the fathead minnow, Pimephales promelas, and the northern leopard frog, Rana pipiens. Fathead minnows were exposed from the larval stage through sexual maturity, while northern leopard frogs were exposed as eggs and grown through metamorphosis. An F1 generation of fathead minnows was cultured in control water to test for transgenerational effects of the parental exposure to wastewater effluent. A third experiment examined the effect of triclosan, an antimicrobial compound commonly found in wastewater effluent, on the growth and development of the pickerel frog, Rana palustris. A decrease in the expression of secondary sex characteristics and an increase in the gonadosomatic index of male fathead minnows exposed to wastewater effluent in the parent generation were observed. Accelerated reproductive activity and an increase in the expression of male secondary sex characteristics were observed in the F1 generation whose parent generation was cultured in wastewater treatments. Juvenile male northern leopard frogs exhibited an increased incidence of individuals with testicular oocytes. Leopard frogs cultured in the two highest concentrations of wastewater effluent took significantly longer to reach metamorphosis than both the control and the lowest wastewater concentration treatment. Exposure to triclosan did not significantly affect the growth or development of the pickerel frog. The results of this study suggest that long-term exposure to wastewater effluent can interfere with the sexual development of the fathead minnow and can elicit responses in subsequent generations. Sexual development of male leopard frogs and the metamorphic process in leopard frogs is particularly sensitive to wastewater exposure.
机译：已显示废水中含有多种人为化合物，其中许多具有破坏内分泌的特性。尽管多项实验室研究表明，这类化合物在浓度升高的情况下可能会单独发挥作用，但很少有研究试图表征暴露于与环境有关的内分泌干扰物混合物的作用。当前的研究检查了长期暴露于分级浓度的废水对黑头fat鱼（Pimephales promelas）和北部豹蛙（Rana pipiens）的影响。肥头min鱼在幼虫期通过性成熟而暴露，而北豹蛙则以卵的形式暴露并通过变态而生长。在对照水中培养F1代的黑头min鱼，以测试父母暴露于废水中的跨代效应。第三个实验检查了三氯生（一种常见于废水中的抗菌化合物）对the蛙蛙蛙生长和发育的影响。观察到在父代中暴露于废水中的雄性黑头min鱼次生性别特征的表达降低和性腺体指数增加。在其父代在废水处理中培养的F1代中，观察到生殖活动的加快和雄性第二性特征表达的增加。少年雄性北豹蛙表现出睾丸卵母细胞个体的发病率增加。在两种最高浓度的废水中培养的豹蛙达到变态的时间比对照和最低浓度的废水处理都要长得多。暴露于三氯生并没有显着影响the鱼的生长或发育。这项研究的结果表明，长期暴露于废水中会干扰the头min鱼的性发育，并会引起后代的反应。雄性豹蛙的性发育和豹蛙的变态过程对废水暴露特别敏感。

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  • 作者

    Sowers, Anthony D.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Biology Animal Physiology.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 107 p.
  • 总页数 107
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生理学;环境科学基础理论;
  • 关键词

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