AP PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO PROVIDED BY LSU AGCENTER FOR EDITORIAL PURPOSES ONLY.
In this photo provided by LSU AgCenter, Louisiana State University Agricultural Center entomologist Linda Hooper-Bui collects sediment on Sept. 9, 2011, from the edge of a marsh in north Bay Batiste in Plaquemines Parish. This marsh was hit by oil from the BP PLC well more than a year earlier, and residue from the spill shows black under her hand. Hooper-Bui is leading a study to compare insect and spider populations in marshes hit by the spill to those left untouched by it. (AP Photo/ LSU AgCenter, Xuan Chen via Hooper-Bui)