Holmqvist Niklas, Stenroth Patrik, Berglund Olof, Nyström Per, Graneli Wilhelm, Larsson Per
Department of Ecology, Ecotoxicology, Ecology Building, Lund University, SE-223 62 Lund, Sweden.
Chemosphere. 2007 Jan;66(6):1070-8. doi: 10.1016/j.chemosphere.2006.06.064. Epub 2006 Aug 1.
We investigated the accumulation of PCB and DDT in crayfish populations in 10 streams in southern Sweden. The results were compared with an earlier study on crayfish in lakes from the same area. We found that the concentration of pollutants in crayfish did not differ between the two types of systems. Variation in body burden was higher in stream living crayfish probably because of the higher influence from pollutants deposited in the catchment area and the more dynamic transport in streams. In streams, p,p'-DDE concentrations were positively correlated to trophic status (total phosphorous) while PCB did not show any correlation with the nutrient regime. Further, mean SigmaPCB and p,p'-DDE concentrations in crayfish did not correlate in streams. We suggest that the sources of the two pollutants differ for stream living crayfish. The results indicate that crayfish in streams are affected to a higher degree to pollutants in the catchment area and the precipitation regime. In lakes, internal processes govern uptake of pollutants in crayfish.
我们调查了瑞典南部10条溪流中小龙虾种群体内多氯联苯（PCB）和滴滴涕（DDT）的蓄积情况。将结果与该地区湖泊小龙虾的早期研究进行了比较。我们发现，这两种系统中小龙虾体内污染物浓度没有差异。溪流中生活的小龙虾体内污染物负荷变化更大，可能是因为集水区沉积的污染物影响更大，以及溪流中的物质传输更具动态性。在溪流中，p,p'-滴滴伊（p,p'-DDE）浓度与营养状态（总磷）呈正相关，而多氯联苯与营养状况没有任何相关性。此外，溪流中小龙虾体内多氯联苯和p,p'-DDE的平均总浓度没有相关性。我们认为，这两种污染物的来源对于溪流中生活的小龙虾而言是不同的。结果表明，溪流中的小龙虾受集水区污染物和降水情况的影响程度更高。在湖泊中，小龙虾体内污染物的吸收受内部过程控制。
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