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首页> 外文期刊>Environmental Science & Technology >Will Lake Michigan Lake Trout Meet the Great Lakes Strategy 2002 PCB Reduction Goal?
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Will Lake Michigan Lake Trout Meet the Great Lakes Strategy 2002 PCB Reduction Goal?

机译:密歇根湖鳟鱼会达到大湖战略2002年减少PCB的目标吗?

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The Great Lakes Strategy 2002 establishes the long-term goal that all Great Lakes fish should be safe to eat without restriction. As an indicator of progress toward that goal, the Strategy specifies that lake trout PCBs will decline 25% from 2000 to 2007. We estimated the plausibility of achieving this near-term goal by examining a time-series of Lake Michigan lake trout PCB concentrations from 1972 to 2000. We used two different Bayesian approaches, Bayesian model averaging (BMA) and dynamic linear models (DLM), to model the trajectory of these historical data and forecast concentrations through 2007. Both approaches indicate that the probability of a 25% reduction from 2000 to 2007 is negligible. The most likely lake trout PCB declines predicted by the BMA and DLM over this time period are 6.8% and 8.9%, respectively. Our results suggest that declines in lake trout PCBs will be in the range of 5-10% assuming conditions similar to recent years. This rate of decline will be difficult to discern without adequate data collection. If sufficient data are not gathered to document further declines, then the relaxation of lake trout consumption advisories is indeed a long-term prospect.
机译:《 2002年大湖战略》确立了长期目标,即所有大湖鱼都应安全食用而不受限制。作为实现该目标的指标,该策略指定从2000年到2007年,鳟鱼的多氯联苯含量将下降25%。我们通过考察密歇根湖湖鳟的多氯联苯浓度时间序列,估计了实现这一近期目标的合理性。 1972年至2000年。我们使用了两种不同的贝叶斯方法,即贝叶斯模型平均(BMA)和动态线性模型(DLM),对这些历史数据的轨迹进行了建模,并预测了到2007年的浓度。这两种方法均表明降低25%的可能性从2000年到2007年微不足道。 BMA和DLM预测在此期间最有可能出现的鳟鱼PCB下降幅度分别为6.8%和8.9%。我们的结果表明,假设条件与近年来相似,湖鳟多氯联苯的下降幅度将在5-10%之间。如果没有足够的数据收集,将很难分辨出这种下降速度。如果没有收集到足够的数据来证明进一步的下降,那么放宽对湖鳟的消费咨询确实是一个长期的前景。

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