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首页> 外文期刊>Hydrobiologia >Freshwater mussel (Unionidae) shells document the decline of trace element pollution in the regional watersheds of Chicago (Illinois, USA)
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Freshwater mussel (Unionidae) shells document the decline of trace element pollution in the regional watersheds of Chicago (Illinois, USA)

机译：淡水贻贝（ununidae）贝壳记录了芝加哥区域流域的微量元素污染的下降（伊利诺伊州，美国）

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摘要

The present study analyzed trace element concentrations from the shells of native freshwater mussels collected from the headwater tributaries of the Illinois River (USA). These analyses were conducted to determine whether (A) anthropogenic enrichment could be observed and (B) whether enrichment had decreased following the enactment of Clean Water Act legislation in the 1970s. Collections archived in museums allowed comparison of the pre-Columbian period, the mid-20th century, and the early 21st century. The element Cu was consistently elevated above pre-Columbian baselines, while the elements As, Cd, Fe, and Zn were elevated in some collections. Although higher than baseline, concentrations Zn consistently declined from the mid-20th century to modern times, although differences occurred at individual sites. There was evidence for food web influence: the element Mn was significantly negatively correlated to sediment primary productivity as indexed by shell delta C-13 and Cu was positively correlated to trophic position as reflected by shell delta N-15. Zn correlated to stream order across all time periods. We conclude that a mixture of historic factors affecting pollution control and land use patterns in the watershed led to sometimes conflicting effects on trace element bioaccumulation in mussel shells.
机译：本研究分析了从伊利诺伊州河流（美国地区河流的地下支流中的天然淡水贻贝壳中的痕量元素浓度。进行了这些分析以确定是否可以观察到（b）在20世纪70年代颁布清洁水法立法后富集的富集是否下降。在博物馆存档的收藏允许比较哥伦比亚时期，20世纪中期和21世纪初。元素Cu始终升高到哥伦比亚前基线上方，同时在一些收集中升高了CD，Fe和Zn的元素。虽然高于基线，但浓度Zn从20世纪中期到近代持续下降，尽管在各个地点发生差异。有证据表明食物网络影响：根据壳δC-13分析，元素Mn与沉积物初级生产率显着呈负相关，并且Cu与壳δn-15反射的营养位置呈正相关。 Zn与所有时间段之间的流顺序相关。我们得出结论，影响流域中污染控制和土地利用模式的历史因素的混合导致了有时对贻贝壳中微量元素生物累积的影响有时相互矛盾。

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