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Trumpeter Swan and Osprey populations recovering in Wisconsin

March 21, 2:51 AMGreen Living ExaminerAmy Lou Jenkins
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AP Photo/Chris O'Meara

The state Natural Resources Board has approved removing the Trumpeter Swan and Osprey from the state Endangered and Threatened Species list. Trumpeter Swans had been listed as a state endangered species while Ospreys were listed as a state threatened species. Both species will continue to receive protection under the federal Migratory Bird Treaty Act.

The delisting was approved by a unanimous vote of the board members. Not long ago both the Trumpeter Swan and the Osprey were nearly extinct in our state; however, populations of both birds have recovered to the point where they are believed to be secure. DDT and loss of habitat had reduced populations of Osprey to a nonviable numbers. The large low-flying swans were an easy target. Hunters expatriated them from the state.   

The successful recovery of the Trumpeter Swan and Osprey is the result of decades of hard work on the part of DNR staff, the conservation community, state, federal, and tribal governments, as well as numerous individuals and businesses. Bans of DDT and a program of building platforms for Osprey have promoted their recovery. The Milwaukee county zoo helped incubate swan eggs which were collected in Alaska. Some cygnets were let loose into marshes in central and northern Wisconsin. The birds were monitored by college students who anonymously helped the birds to find feeding areas using camouflaged floats. Other cygnets were raised in more protected settings in Pewaukee and then released when grown.
 
The state counted 120 nesting pairs of Trumpeter Swans and 500 pairs of Osprey in 2008.  Lead from shotguns, power lines, and habitat loss and degradations continue to threaten the birds. The DNR will continue to monitor both bird species to ensure the health of the populations.

 

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