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POLYCHLORINATED BIPHENYL CONGENER DISTRIBUTIONS IN BURBOT: EVIDENCE FOR A LATITUDE EFFECT

机译:BURBOT中的多氯联苯同源分布:经度效应的证据

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摘要

The authors compared the distributions of the congeners of polychlorinated biphenyls (PCBs) detected in whole-body samples of burbot (Lota lota) from Great Slave Lake and Lake Erie. Total PCB concentrations in Great Slave Lake burbot were about one-sixtieth of the concentrations in Lake Erie burbot. Burbot from Great Slave Lake contained a higher proportion of lower-chlorinated (2-6 chlorines) congeners than did burbot from Lake Erie; the reverse occurred for more highly chlorinated (7-9 chlorines) congeners. Hexachloro congeners, followed by pentachloro congeners, dominated the proportions of total PCBs in burbot from both lakes. There were no differences between sexes in whole-body samples or between gonad and somatic tissues in the proportions of the 39 congeners and 3 sets of coeluters detected in burbot from Great Slave Lake. In contrast, there were distinct sex differences in congener distributions for older burbot from Lake Erie. The results generally supported a prediction of higher proportions of lower-chlorinated PCB homologs in organisms in remote polar areas. However, the latitudinal effect on PCB congener distribution may be more complex than that portrayed in previous studies.
机译:作者比较了在大奴湖和伊利湖的burbot(Lota lota)全身标本中检测到的多氯联苯(PCBs)同类物的分布。大奴湖柏树中PCB的总浓度约为伊利湖柏树中PCB浓度的六十分之一。来自大奴湖的伯特比来自伊利湖的伯特含有更多的低氯化物(2-6氯)同类物。反之则发生于更高氯化度(7-9氯)的同类物。六氯同类物,其次是五氯同类物,主导了两个湖中江鳕中多氯联苯的总量。在大奴湖的江豚中检测到的39种同源物和3组腔肠菌的比例在全身样本中的性别或性腺与体细胞组织之间没有差异。相反,来自伊利湖的较老的江鳕的同类动物分布存在明显的性别差异。该结果总体上支持了偏远极地地区生物中较低氯化物PCB同系物比例更高的预测。但是,对PCB同类物分布的纬度影响可能比以前的研究更为复杂。

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