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Stable isotope dynamics of nitrogen sewage effluent uptake in a semi-arid wetland

机译：半干旱湿地中氮污水流出物的稳定同位素动力学

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Our objectives were to determine (1) how much N is transferred into the food web via plants from a wetland receiving not only inputs of treated sewage effluent, but also containing contaminants such as polychlorinated biphenyls (PCBs), (2) how birds, as consumers, utilize exogenous N and uptake PCBs in relation to the food web of the wetlands, (3) the feasibility of using isotopic analysis in estimating trophic levels in a semi-arid system. Our results demonstrate that there is very high spatial variability in the N isotopic composition of primary producers. Birds had lower variability in δ~(15)N, despite feeding at multiple trophic levels. In very high spatial variability in δ~(15)N of primary producers, it is difficult to use N isotope techniques to define trophic levels relevant to the bioaccumulation of organic pollutants, but it is possible to track the flow of exogenous N through the food web.
机译：我们的目标是确定（1）从湿地通过植物将多少N转移到食物网中，该湿地不仅接收经过处理的污水的输入，而且还包含污染物，例如多氯联苯（PCB），（2）消费者，利用与湿地食物网相关的外源氮和摄取多氯联苯，（3）在半干旱系统中使用同位素分析估算营养水平的可行性。我们的结果表明，初级生产者的N同位素组成具有很高的空间变异性。尽管在多个营养水平下觅食，鸟类的δ〜（15）N变异性较低。在初级生产者的δ〜（15）N的空间变异性非常高的情况下，很难使用N同位素技术来确定与有机污染物的生物累积相关的营养水平，但是有可能跟踪通过食物的外源N的流动。网络。

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