Detailed project information for Study Plan Number 02051-03

Branch :	Aquatic Ecology Branch
Study Plan Number :	02051-03
Study Title :	Determination of source and bioavailability of mercury to bald eagles in Maine
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SIS Number :	5002160
Primary Program Element :	Contaminants
Second Program Element :	Wildlife
Status :	Completed
Abstract :	The bald eagle population in Maine has increased from a low of 20 nesting pairs in 1972 to about 120 nesting pairs in 1990-1993. However, the reproductive success of these birds has stabilized at about 0.8 fledgling per pair per year. The goal for full recovery of the population is 150 nesting pairs producing 1 fledgling per pair per year. A two year study (1991-92) of contaminants in nestling eagles in Maine demonstrated very high levels of mercury in birds from inland areas of the state. Inland birds averaged 18 ppm mercury in breast feathers whereas coastal birds averaged 5 ppm. Mercury levels were especially high in birds nesting near hydroelectric impoundments, with concentrations as high as 35 ppm. Nestling eagles from the Great Lakes region contain less than 8 ppm mercury in feathers, and birds in Florida average 4 ppm. Laboratory tests with other species of birds indicate that reproductive success is impaired at mercury levels above 11 ppm in feathers.
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