The Grand Canyon Trust and the National Park Service will hold a three-day symposium to explore the untested concept of ecosystem management as it applies to public and private lands in the West. "Ecosystem Management: Buzzword of the "90s," which runs Oct. 6-8 in Flagstaff, Ariz., features National Park Service Director Roger Kennedy; Ray Rasker, an economist with The Wilderness Society; and Johanna Wald, an attorney with the Natural Resources Defense Council. The program also includes an evening of chamber music preceding a speech by University of Colorado law professor Charles Wilkinson and a wine and cheese reception honoring the Arizona congressional delegation. The conference, to be held in Cline Auditorium on the campus of Northern Arizona University, costs $125. For more information, contact the Grand Canyon Trust, P.O. Box 30848, Flagstaff, AZ 86003-9962 (602/774-7488).