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首页> 外文学位 >The dynamics of carbon and nitrogen stable isotope analysis of aquatic organisms within the Grand River watershed.
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The dynamics of carbon and nitrogen stable isotope analysis of aquatic organisms within the Grand River watershed.

机译：大河流域内水生生物碳氮稳定同位素分析的动力学。

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摘要

Stable isotope analysis is a tool employed in ecological studies to provide information on the movement of elements and energy through a system. The stable carbon and nitrogen isotope analysis of aquatic organisms has been commonly used to address questions related to energy transfer between organisms and to identify the reliance of aquatic organisms on different sources of organic matter within the system. Within the rivers, stable isotope analysis has been used to describe food webs and connect conditions within the watershed with the river. The Grand River watershed is a predominantly agricultural watershed which receives inputs from ∼26 MWWTP and is managed for flow by multiple large reservoirs and weirs. The stable isotope values of aquatic organisms within this watershed were analyzed from samples collected between May and September, 2007. Sites were selected in relation to three different municipal waste water treatment plants (MWWTP) in the centre of the watershed and along a 200 km stretch of the main stem of the Grand River. Results show that stable isotope analysis can be used to differentiate organisms collected from different sites and which represent different trophic levels within the river system under select conditions. Sites which are influences by inputs from organic matter or nutrients within distinct isotope values can be distinguished easily if the input is large and the isotope values are significantly distinct from background values. For smaller inputs changes in stable isotope values were not observed relative the background variability in the system. In this case, sites should be selected to allow for the characterization the variation in isotope values already occurring within the river. Samples collected later in the growing seasons have more distinctive isotope values are between sites. At sites where seasonal variation is greater, the organisms collected may not show a clear separation between trophic levels. A lack of knowledge regarding the time period represented by the tissues of the organisms challenges interpretation these results. It is concluded that stable isotope values of aquatic organisms reflected the condition of this watershed. For nitrogen increasing loads from point sources were accompanied by increasing isotope values. Stable isotope values decreased over the river reach where recovery in river condition occurs as a result of ground water inputs. The influence of individual large MWWTP and reservoirs was observable and the management of the MWWTP and reservoir appears to affect the changes in isotope values which are observed.
机译：稳定同位素分析是生态学研究中使用的一种工具，可提供有关元素和能量通过系统运动的信息。对水生生物进行稳定的碳和氮同位素分析通常用于解决与生物之间的能量转移有关的问题，并确定水生生物对系统内不同有机物来源的依赖性。在河流内部，稳定的同位素分析已用于描述食物网，并将流域内的条件与河流联系起来。大河流域是一个主要的农业流域，它从〜26 MWWTP接收输入，并由多个大型水库和堰进行流量管理。从2007年5月至2007年9月收集的样本中分析了该流域内水生生物的稳定同位素值。根据流域中心和沿200 km延伸的三个不同的市政废水处理厂（MWWTP）选择了站点大河的主干。结果表明，稳定的同位素分析可用于区分从不同地点收集的生物，这些生物在特定条件下代表河流系统中的不同营养水平。如果输入量大且同位素值与背景值明显不同，则可以轻松地区分受不同同位素值内有机物或营养物输入影响的位点。对于较小的输入，相对于系统的背景可变性，未观察到稳定同位素值的变化。在这种情况下，应选择地点以表征河流中已经存在的同位素值的变化。在生长季节后期收集的样品在站点之间具有更独特的同位素值。在季节性变化较大的地点，所收集的生物可能在营养水平之间未显示清楚的分离。缺乏有关由生物组织代表的时间段的知识，对解释这些结果提出了挑战。结论是，稳定的水生生物同位素值反映了该流域的状况。对于氮，来自点源的负荷增加，同时同位素值也增加。由于地下水的输入，稳定的同位素值在河流范围内有所下降，在此条件下河流状况得以恢复。单个大型MWWTP和储层的影响是可观察到的，MWWTP和储层的管理似乎会影响所观察到的同位素值的变化。

著录项

  • 作者

    Loomer, Heather Anne.;

  • 作者单位

    University of Waterloo (Canada).;

  • 授予单位 University of Waterloo (Canada).;
  • 学科 Biogeochemistry.;Geochemistry.;Biology Limnology.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 90 p.
  • 总页数 90
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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