Tribune photo by Zbigniew Bzdak
November 5, 2009
Noel Pavlovic, an ecologist with the U.S. Geological Survey, takes a sample of leaves before an experimental burn to control invasive species his research team conducted in the Indiana Dunes National Lakeshore Park.
COMMENTING POLICY:Readers are encouraged to post comments that are germane to the article. We reserve the right to remove any user, and to delete comments that contain abusive language or personal threats, as well as those that are racist or demeaning. Readers may report comments by clicking "Report Abuse." Once a comment has been flagged, a Baltimore Sun staffer will investigate. Click here for more information on commenting.