Kay Denise P, Blankenship Alan L, Coady Katherine K, Neigh Arianne M, Zwiernik Matthew J, Millsap Stephanie D, Strause Karl, Park Cyrus, Bradley Patrick, Newsted John L, Jones Paul D, Giesy John P
ENTRIX, Inc., 4295 Okemos Road, Suite 101, Okemos, Michigan 48864, USA.
Environ Sci Technol. 2005 Aug 15;39(16):5964-74. doi: 10.1021/es048317c.
A series of field studies were conducted to gain a better understanding of the bioaccumulation and dynamics of polychlorinated biphenyl (PCB) congeners in the aquatic food web of the Kalamazoo River flood plain. Representative species of passerine birds, mammals, fish, aquatic plants, invertebrates, and colocated sediments were collected from areas located within submerged portions of the former Trowbridge impoundment and also from areas located at an upstream reference location. In most matrixes, total concentrations of PCBs were significantly greater in the downstream study area compared to the upstream reference location. Patterns of PCB congeners varied among trophic levels due to selective bioaccumulation of more chlorinated congeners in upper trophic level organisms. There were no statistically significant differences in total PCB concentrations among sampling grids within either site or temporally among three sampling seasons between May and September. The greatest total PCB concentrations were detected in adult tree swallows (mean = 8.7 mg/kg wet weight (ww)) and fish (mean = 4.4 mg/ kg ww) collected from the former Trowbridge impoundment. Concentrations of total 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQs) were greatest in egg, nestling, and adult tree swallows collected from the former Trowbridge impoundment. There was not a significant correlation between concentrations of total PCBs and TEQs at either site in the mammalian or avian food webs. The relative potency of the mixture of PCBs, expressed as the ratio of TEQs to total PCBs, increased with trophic position in the avian and mammalian aquatic food webs located within the former Trowbridge impoundment.
开展了一系列实地研究，以更好地了解卡拉马祖河漫滩水生食物网中多氯联苯（PCB）同系物的生物累积和动态变化。从前特罗布里奇蓄水池淹没区域以及上游参考地点采集了雀形目鸟类、哺乳动物、鱼类、水生植物、无脊椎动物的代表性物种以及同位沉积物。在大多数基质中，与上游参考地点相比，下游研究区域的多氯联苯总浓度显著更高。由于营养级较高的生物对含氯量更高的同系物具有选择性生物累积作用，多氯联苯同系物的模式在不同营养级之间存在差异。在两个地点的采样网格之间，或者在5月至9月的三个采样季节中，多氯联苯总浓度在时间上均无统计学显著差异。在前特罗布里奇蓄水池采集的成年树燕（平均 = 8.7毫克/千克湿重（ww））和鱼类（平均 = 4.4毫克/千克ww）中检测到的多氯联苯总浓度最高。从前特罗布里奇蓄水池采集的蛋、雏鸟和成年树燕中，2,3,7,8 - 四氯二苯并 - p - 二恶英当量（TEQ）的总浓度最高。在哺乳动物或鸟类食物网的任何一个地点，多氯联苯总浓度与TEQ浓度之间均无显著相关性。以前特罗布里奇蓄水池内的鸟类和哺乳动物水生食物网中，多氯联苯混合物的相对效力（以TEQ与多氯联苯总量的比率表示）随营养级升高而增加。
