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Mercury concentrations in blood and feathers of nestling Bald Eagles in coastal and inland Virginia

Avian Research 2019年第1期10卷 36-42页

作者： David E.Kramar Bill Carstensen steve prisley Jim Campbell Department of Anthropology and Earth Science Minnesota State University Moorhead Department of Geography Virginia Tech National Council for Air and Stream Improvement

Background:Mercury(Hg) and methylmercury are widely considered significant issues for wildlife,and in particular,piscivorous birds due to their widespread availability and neurotoxic *** a substantial number of studies of Hg contamination of Bald Eagles(Haliaeetus leucocephalus) have been conducted throughout the east coast of the United States,little has been done that directly addresses Hg contamination in Bald Eagles in Virginia,particularly the inland ***:We collected blood and feather samples from nestling Bald Eagles in the coastal plain,piedmont,and western regions of Virginia in an effort to determine which areas of the state were more likely to contain populations showing evidence of Hg *** analyzed the samples for total Hg using a Milestone ***:Samples collected from individuals located in the coastal region exhibited low concentrations of Hg compared to those further inland located on freshwater rivers and *** collected from the inland population exhibited levels in some areas that are approaching what may be considered to be sub-lethal to avian health(blood:mean 0.324 mg/kg,SE = 0.13,range = 0.06-0.97 mg/kg;feather:mean = 8.433 mg/kg,SE = 0.3,range = 3.811-21.14 mg/kg).Conclusions:Even after accounting for known point-sources of Hg,the inland eagle population in Virginia is susceptible to concentrations of Hg that are significantly higher than their coastal ***,several locations besides those currently known to be impacted by point-sources are exhibiting concentrations that are approaching a sub-lethal level.

关键词： Bald Eagle Haliaeetus leucocephalus Mercury Methyl-mercury Virginia

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