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Lake Michigan Bald Eagle Populationis Recovering from Contamination Effects
Midwest Region, January 5, 2005
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A recently released book, State of Lake Michigan:  Ecology, Health and Management, includes a chapter on Bald Eagle ecology and contaminants authored by staff of the Green Bay Ecological Services Field Office, Wisconsin Department of Natural Resources, University of Minnesota, and an independent reseacher.  In the 30 years since DDT was banned, the Bald Eagle has gradually become a familiar sight along the shores of Lake Michigan.  Eggs laid by the few remaining pairs in the 1970s did not hatch, but today, reproduction is at high enough levels to sustain the ongoing population recovery.  Research indicates that food availability is high enough along the Lake Michigan shoreline to sustain a healthy breeding eagle population.  Even though the amounts of DDE and PCBs in eagle blood and eggs generally remain above thresholds that indicate health impairments, empirical field data cause us to expect continued increases in the number of breeding pairs and sustained population productivity.

Contact Info: Midwest Region Public Affairs, 612-713-5313, charles_traxler@fws.gov



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