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Use of phytobenthos to evaluate ecological status in lowland Romanian lakes

机译：植物植物的使用来评估低地罗马尼亚湖泊生态地位

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In contrast to diatom assemblages in lakes in most other parts of Europe, those in lowland lakes in Romania appear to be determined primarily by biochemical oxygen demand (BOD) and conductivity rather than by nutrients. This has confounded the development of a Water Framework Directive-compatible phytobenthos assessment system for Romanian lakes and led, instead, to the development of a new metric, the Romanian Diatom Index (RDI), which captures these gradients. The primary anthropogenic stressor is assumed to be BOD whilst conductivity is a product of background geology and climate. The RDI is strongly correlated with BOD, and ecological quality ratios (EQRs) are computed by dividing the observed RDI by an expected value, determined from the 90th percentile of the relationship between RDI and conductivity. This equates to the "best available" RDI at any point on the conductivity gradient and, in the absence of true "reference sites", has been assumed to represent the boundary between high and good status. The boundary between good and moderate status has been set at the point where the sum of valves of taxa tolerant to elevated BOD exceeds the sum of valves of taxa that are sensitive to elevated BOD. The position of this boundary has been further validated by the use of a Threshold Indicator Species Analysis (TITAN). In view of the susceptibility of conductivity to climate warming, 2010 values of conductivity have been used to ensure a stable benchmark against which future changes can be measured. This study highlights the challenges involved in performing reliable ecological assessments in situations that are, by the standards of much of Europe, atypical.
机译：与欧洲大多数其他地区的湖泊中的锡塔姆组合形成鲜明对比，罗马尼亚的低地湖泊中的湖泊似乎主要通过生化需氧量（BOD）和电导率而不是营养而确定。这使得为​​罗马尼亚湖湖泊和LED的水框架指令兼容植物植物评估系统的开发变得困惑，而是为了开发一个新的公制，罗马尼亚迪亚斯特指数（RDI），它捕获了这些渐变。假设原发性促进压力源是BOD，而电导率是背景地质和气候的产物。 RDI与BOD强烈相关，通过将观察到的RDI划分预期值来计算生态质量比（EQRS），从RDI和电导率之间的关系的第90百分位确定。这相当于导电梯度的任何点处的“最佳可用”RDI，并且在没有真正的“参考网站”的情况下，已经假设表示高于和良好状态之间的边界。良好和中等地位之间的边界已经设定为宽容升高的阀阀的总和超过对升高的BOD敏感的阀门阀门的总和。通过使用阈值指示物种分析（泰坦）进一步验证了该边界的位置。鉴于导电性与气候变暖的易感性，2010年的电导率值已被用于确保可以测量未来变化的稳定基准。本研究突出了在欧洲大部分标准，非典型的情况下表演可靠的生态评估所涉及的挑战。

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