U.S. Geological Survey, Upper Midwest Environmental Sciences Center, 2630 Fanta Reed Rd., La Crosse, WI, 54603, USA.
Michigan Department of Environmental Quality, P.O. Box 30473, Lansing, MI, 48909-7973, USA.
Arch Environ Contam Toxicol. 2019 Jul;77(1):1-13. doi: 10.1007/s00244-019-00620-1. Epub 2019 Apr 6.
A site in northeastern Michigan, Oscoda Township, has some of the highest recorded exposure in birds to perfluorinated substances (PFASs) in the United States. Some egg and plasma concentrations at that location exceeded the lowest reproductive effect threshold established for two avian laboratory species. The objectives of this study were to determine whether there were reproductive effects or physiological responses in a model bird species, the tree swallow (Tachycineta bicolor), associated with this extremely high exposure to PFASs. The lack of exposure above background to other contaminants at this site allowed for an assessment of PFAS effects without the complication that responses may be caused by other contaminants. A secondary objective was to determine the distribution of PFASs in multiple tissue types to better understand and interpret residues in different tissues. This can best be done at highly exposed locations where tissue concentrations would be expected to be above detectable levels if they are present in that tissue. There were no demonstrable effects of PFAS exposure on reproduction nor on most physiological responses.
美国密歇根州东北部的奥科索达镇（Oscoda Township）的一个地点，鸟类接触全氟化合物（PFAS）的暴露水平创下历史新高。该地点的一些卵和血浆浓度超过了为两种鸟类实验室物种设定的最低生殖效应阈值。本研究的目的是确定在这种极高水平的 PFAS 暴露下，与模型鸟类 - 食蚊鸟（Tachycineta bicolor）相关的生殖效应或生理反应。该地点其他污染物的暴露水平低于背景水平，因此可以在没有其他污染物可能导致反应的情况下评估 PFAS 的影响。次要目标是确定 PFAS 在多种组织类型中的分布，以便更好地了解和解释不同组织中的残留物。如果在组织中存在 PFAS，在高度暴露的地点可以最好地完成这一工作，因为在这些地点，组织浓度预计会高于可检测水平。PFAS 暴露对繁殖或大多数生理反应没有明显影响。
