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.
Aspen, wolf, and wildlife photos
- See the change in the Aspen Canopy over time
- Pictures of wolves and elk, taken in Yellowstone National Park.
- Quaking aspen conditions in other areas of the western U.S.
- Sustaining Aspen in Western Landscapes Field Trip, June 14, 2000.
Other sources of information
- Ecological Dynamics on Yellowstone's Northern Range - by The National Academy of Science
- Bird species found in aspen of northern Yellowstone National Park (pdf)
- Tree of the Month page - for quaking aspen biology and natural history information