Neigh Arianne M, Zwiernik Matthew J, Bradley Patrick W, Kay Denise P, Jones Paul D, Holem Ryan R, Blankenship Alan L, Strause Karl D, Newsted John L, Giesy John P
Zoology Department, Center for Integrative Toxicology, National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan 48824, USA.
Environ Toxicol Chem. 2006 Jun;25(6):1503-11. doi: 10.1897/05-046r.1.
Eggs, nestlings, and adults of the eastern bluebird (Sialia sialis) and house wren (Troglodytes aedon) were collected at a polychlorinated biphenyl (PCB)-contaminated site and a reference location on the Kalamazoo River (MI, USA). Eggs and nestlings of eastern bluebirds at the more contaminated location contained concentrations of 8.3 and 1.3 mg/kg, respectively, of total PCBs and 77 and 6.3 ng/kg, respectively, of 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQs). Eggs, nestlings, and adults of house wrens from the contaminated location contained 6.3, 0.77, and 3.2 mg/kg, respectively, of PCBs and 400, 63, and 110 ng/kg, respectively, of TEQs. Concentrations of total PCBs and TEQs in tissues at the more contaminated location were significantly greater than concentrations in tissues at the reference site for all tissue types of both species. Exposures of the two species studied were different, which suggests that terrestrial-based insectivorous passerine species, foraging in the same area, may have differential exposure to PCBs depending on specific foraging techniques and the insect orders that are targeted. Despite the greater accumulation of PCBs at the more contaminated location, the risk of exposure to PCBs did not exceed the threshold for adverse effects at either location.
在美国密歇根州卡拉马祖河的一个多氯联苯（PCB）污染地点和一个参照地点采集了东部蓝鸲（Sialia sialis）和家鹪鹩（Troglodytes aedon）的卵、雏鸟和成鸟。在污染更严重地点的东部蓝鸲的卵和雏鸟，总多氯联苯含量分别为8.3毫克/千克和1.3毫克/千克，2,3,7,8 - 四氯二苯并 - p - 二恶英当量（TEQs）分别为77纳克/千克和6.3纳克/千克。来自污染地点的家鹪鹩的卵、雏鸟和成鸟，多氯联苯含量分别为6.3毫克/千克、0.77毫克/千克和3.2毫克/千克，TEQs分别为400纳克/千克、63纳克/千克和110纳克/千克。对于这两个物种的所有组织类型，污染更严重地点的组织中总多氯联苯和TEQs的浓度显著高于参照地点组织中的浓度。所研究的两个物种的暴露情况不同，这表明在同一区域觅食的陆栖食虫性雀形目物种，可能因特定的觅食技巧和所针对的昆虫目不同而对多氯联苯有不同的暴露。尽管在污染更严重的地点多氯联苯积累更多，但在这两个地点，多氯联苯的暴露风险均未超过产生不良影响的阈值。
