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首页> 外文期刊>Environmental Science & Technology >Watershed Land Use Is Strongly Linked to PCBs in White Perch in Chesapeake Bay Subestuaries
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Watershed Land Use Is Strongly Linked to PCBs in White Perch in Chesapeake Bay Subestuaries

机译：切萨皮克湾子河口的白鲈鱼流域土地利用与PCBs密切相关

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摘要

We related total PCBs (t-PCBs) in white perch (Morone americana), an abundant estuarine resident that supports a valuable recreational and commercial fishery in the mid-Atlantic region, to the amount and spatial arrangement of developed land in watersheds that discharge into 14 subestuaries of Chesapeake Bay. We considered the intensity of development in watersheds using four developed land-use measures (% impervious surface, % total developed land, % high-intensity residential + commercial [%high-res/comm], and% commercial) to represent potential source areas of PCBs to the subestuaries. We further evaluated the importance of source proximity by calculating three inverse-distance weighted (IDW) metrics of development, an approach that weighted developed land near the shoreline more heavily than developed land farther away. Unweighted percentages of each of the four measures of developed land explained 51-69% of the variance in t-PCBs. However, IDWs markedly improved the relationships between% developed land measures and t-PCBs. Percent commercial land, weighted by its simple inverse distance, explained 99% of the variance in t-PCBs, whereas the other three measures explained as much as 93-97%. PCBs historically produced or used in commercial and residential areas are apparently persisting in the environment atthe scale of the watersheds and subestuaries examined in this study, and developed land close to the subestuary has the greatest unit effect on t-PCBs in fish. These findings provide compelling evidence for a strikingly strong linkage between watershed land use and t-PCBs in white perch, and this relationship may prove useful for identifying unsampled subestuaries with a high risk of PCB contamination.
机译：我们将白鲈鱼（Morone americana）中的多氯联苯（t-PCBs）与大西洋沿岸流域中已开发流域的大量土地和空间布局相关联，该居民支持大西洋中部地区宝贵的娱乐和商业渔业切萨皮克湾的14个子河口。我们使用四种已开发的土地利用措施（不透水面积百分比，已开发土地总面积百分比，高强度住宅+商业用地的百分比（高分辨率/通信量的％）和商业用地的百分比）来代表潜在流域，从而考虑了流域的开发强度。 PCBs到子河口。我们通过计算三个反距离加权（IDW）开发指标，进一步评估了源近距离的重要性，该方法对海岸线附近的已开发土地进行加权比对更远的土地进行加权。四种已开发土地指标中每个指标的未加权百分比解释了t-PCB差异的51-69％。但是，IDW显着改善了已开发土地面积百分比与t-PCB之间的关系。通过简单的反距离加权的商业用地百分比解释了t-PCB中99％的差异，而其他三项指标解释的比例高达93-97％。历史上在商业和住宅区生产或使用的多氯联苯显然在本研究所研究的集水区和河口范围内在环境中持续存在，并且靠近河口的发达土地对鱼类中的多氯联苯影响最大。这些发现提供了令人信服的证据，表明流域土地利用与白色鲈鱼的多氯联苯之间存在惊人的紧密联系，这种关系可能有助于识别未取样的河口，造成多氯联苯污染的风险很高。

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