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首页> 外文学位 >Establishing thresholds in nutrient concentrations related to biological community response: Implications for nutrient criteria development.
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Establishing thresholds in nutrient concentrations related to biological community response: Implications for nutrient criteria development.

机译：建立与生物群落反应有关的养分浓度阈值：对养分标准制定的意义。

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摘要

Human influence on the landscape has caused contributions of nutrients in surface waters to increase to the point where their presence has substantially altered biological communities. This cultural eutrophication has become a major source of water-quality impairment throughout the United States (US). A nationally recognized problem, the United States Environmental Protection Agency tasked each State, Tribe, and Territory to adopt numeric nutrient criteria. Through the efforts of three studies we investigated the effects of increased nutrients on benthic macroinvertebrate and diatom communities. First we studied the response of more than 100 individual invertebrate taxa, developing species nutrient optima and response thresholds. Then, using this information we constructed a new biological metric to assess eutrophication in wadeable streams. Second, we treated large rivers separately from wadeable streams and investigated the response of biological communities unique to these systems across New York State. Using various newly developed threshold statistics such as nonparametric deviance reduction we identified thresholds related to water-column nutrient data from 40 large river sites. Thresholds were based on shifts in biological community structure (benthic macroinvertebrate and diatom). Third, we related nutrient concentrations to the probability of causing biological community impairment. In 100 wadeable streams across New York State's ecoregions we studied the response of invertebrate and diatom communities along a gradient of nutrients. We showed how certain community metrics exhibit threshold responses to nutrients, sometimes varying based on region. Using these thresholds we suggest nutrient values protective of aquatic life based on biological impairment criteria already established for New York State.
机译：人类对景观的影响导致地表水中养分的贡献增加到一定程度，以至它们的存在大大改变了生物群落。这种文化富营养化已成为整个美国（US）水质受损的主要根源。美国国家环境保护局是一个全国公认的问题，责成每个州，部落和地区采用数字化营养标准。通过三项研究的努力，我们调查了养分增加对底栖大型无脊椎动物和硅藻群落的影响。首先，我们研究了100多个无脊椎动物类群的响应，发展物种的营养最佳状况和响应阈值。然后，利用这些信息，我们构建了一个新的生物学指标来评估可涉水流中的富营养化。其次，我们将大河与可涉河流分开对待，并研究了纽约州这些系统特有的生物群落的反应。使用各种新近开发的阈值统计数据（例如非参数偏差减少），我们确定了与40个大型河流站点的水柱养分数据相关的阈值。阈值基于生物群落结构（底栖无脊椎动物和硅藻）的变化。第三，我们将营养物浓度与引起生物群落受损的可能性相关联。在纽约州生态区的100条可涉水小溪中，我们研究了无脊椎动物和硅藻群落对养分梯度的响应。我们展示了某些社区指标如何表现出对营养的阈值响应，有时会因地区而异。使用这些阈值，我们建议根据已经为纽约州建立的生物损伤标准，为保护水生生物提供营养价值。

著录项

  • 作者

    Smith, Alexander J.;

  • 作者单位

    State University of New York College of Environmental Science and Forestry.;

  • 授予单位 State University of New York College of Environmental Science and Forestry.;
  • 学科 Water Resource Management.;Biology Entomology.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 223 p.
  • 总页数 223
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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