Determining the exposure and magnitude at which various pollutants are differentially assimilated at the breeding and non-breeding grounds of migratory wildlife is challenging. Here, the possibility of applying the migratory connectivity framework to understanding contamination in birds is illustrated by considering flame retardants in inviable eggs of a migratory raptor, the black kite (Milvus migrans). The occurrence and concentration of legacy and emerging compounds in eggs from the southeastern peri-urban area of Madrid city, central Spain, were compared with those from Doñana National Park in southern Spain. A much higher occurrence and concentration of multiple polybrominated diphenyl ethers and Dechlorane 602 were found in Madrid than Doñana, but the opposite patterns were found for Dechlorane Plus. Individuals from these and other breeding areas in western Europe showed a strong intermixing pattern over widespread wintering areas in Africa, as assessed by ringing recoveries and movements tracked by satellite devices. This diffuse migratory connectivity reveals breeding areas as the main contamination grounds. High contamination burdens sequestered in eggs point to rapid assimilation of these compounds before laying, associated with important emission sources in Madrid, especially landfills of partially incinerated urban refuse, and other anthropogenic operations. Diet composition regarding aquatic vs. terrestrial prey, and bioaccumulation and biomagnification processes are suggested to explain differential assimilation of some compounds, especially Dechlorane Plus in Doñana, although a local emission source polluting this area cannot be ruled out. Insight from the migratory connectivity framework can help to disentangle large-scale patterns of contaminant uptake and refocus attention on key regions and potential causes of chemical hazards in declining migratory species and human populations.

确定在迁徙野生生物的繁殖场和非繁殖场上不同污染物被同化的程度和暴露程度是具有挑战性的。在这里，通过考虑迁徙猛禽黑鸢（Milvus migrans）的虫卵中的阻燃剂，说明了应用迁徙连通性框架了解鸟类污染的可能性。）。比较了西班牙中部马德里市东南郊地区鸡蛋中遗留和新兴化合物的发生和浓度，并与西班牙南部多纳纳国家公园的鸡蛋进行了比较。在马德里发现多种多溴联苯醚和十氯烷602的发生率和浓度要比Doñana高得多，但对十氯烷Plus则发现了相反的模式。来自西欧这些繁殖区和其他繁殖区的个体在非洲广泛的越冬地区表现出强烈的混杂模式，这是通过回响的回收和卫星设备追踪的运动来评估的。这种分散的迁徙连通性揭示出繁殖地区是主要的污染地。隔离在鸡蛋中的高污染负担表明这些化合物在产蛋前会迅速被吸收，与马德里的重要排放源相关，尤其是部分焚化的城市垃圾填埋场和其他人为操作。有关水产的饮食组成与。尽管不能排除污染该地区的局部排放源，但建议使用陆地猎物以及生物富集和生物放大过程来解释某些化合物的差异同化，尤其是多纳纳的Dechlorane Plus。迁移连接框架的见解可以帮助弄清大规模污染物的吸收模式，并将注意力重新集中在关键地区以及减少迁移物种和人口的化学危害的潜在原因上。