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A Global, Cross-System Meta-Analysis of Polychlorinated Biphenyl Biomagnification.
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2020-08-11 , DOI: 10.1021/acs.est.9b07693
Kimberly D Prince 1 , Shawn D Taylor 2, 3 , Christine Angelini 1
Affiliation  

Studies evaluating the mechanisms underpinning the biomagnification of polychlorinated biphenyls (PCBs), a globally prevalent group of regulated persistent organic pollutants, commonly couple chemical and stable isotope analyses to identify bioaccumulation pathways. Due to analytical costs constraining the scope, sample size, and range of congeners analyzed, and variation in methodologies preventing cross-study syntheses, how PCBs biomagnify at food web, regional, and global scales remains uncertain. To overcome these constraints, we compiled diet (stable isotopes) data and lipid-normalized concentrations of sum total PCB (PCBST), seven indicator PCB congeners, and their sum (PCB∑7). Our analyses revealed that the number of congeners analyzed, region, and class most strongly predicted PCBST, while similarly, region, class, and feeding location best predicted PCB∑7 and all seven congeners. We also discovered that PCBST, PCB∑7, and the seven indicator congeners all occur in higher concentrations in freshwater than marine ecosystems but are more likely to biomagnify in the latter. Moreover, although the seven congeners vary in their propensity to biomagnify, their trophic magnification factors are all generally greater in the Atlantic than the Pacific. Thus, novel insights regarding PCB biomagnification across taxonomic, food webs, regional, and global scales can be gleaned by leveraging existing data to overcome analytical constraints.

中文翻译:

多氯联苯生物放大倍数的全球,跨系统荟萃分析。

评估支撑多氯联苯(PCBs)(一种全球盛行的受管制持久性有机污染物)的生物放大机制的研究,通常结合化学和稳定同位素分析来确定生物蓄积途径。由于分析成本限制了所分析同类物的范围,样本量和范围,以及防止交叉研究合成的方法学变化,PCB在食品网,区域和全球范围内如何生物放大仍然不确定。为了克服这些限制,我们汇总了饮食(稳定同位素)数据和脂质归一化浓度的总PCB(PCB ST),七个指标PCB同类物及其总和(PCB ∑7)。)。我们的分析表明,分析的同类物数量,区域和类别最能强烈预测PCB ST,而类似地,区域,类别和进料位置最能预测PCB ∑7和所有七个同类物。我们还发现PCB ST,PCB ∑7,并且七个指标同类物都比海洋生态系统的淡水浓度更高,但在海洋生态系统中更可能被生物放大。此外,尽管这七个同类物的生物放大倾向各不相同,但它们的营养放大因子通常在大西洋都比太平洋大。因此,通过利用现有数据克服分析限制,可以收集有关生物分类,食品网,区域和全球规模的PCB生物放大作用的新颖见解。
更新日期:2020-09-15
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