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Aldo Leopold
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The Aspen Project

Quaking aspen (Populus tremuloides) is the most widely distributed tree species in North America. Despite its ability to adapt to disturbance, quaking aspen is declining throughout much of its native range. The Aspen Project is a continuing research project at Oregon State University for the study of quaking aspen and its decline in the western United States.

View Dr. Ripple's video on aspen, elk and wolves in Yellowstone (28 MB).

Scientific articles

Aspen, wolf, and wildlife photos

Other sources of information

News articles about wolves and aspen


hits since May 1998.


Support for the Leopold site is provided by: Dept. of Forest Resources, OSU,
280 Peavy Hall, Corvallis, OR 97331. phone: 541-737-4951 | fax: 541-737-3049
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