Home Page | Global Trophic Cascades Program

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Global Trophic Cascades Program is a research and educational program with the purpose of investigating the role of predators in structuring ecological communities. This program puts special emphasis on the role of potential keystone species in top-down community regulation, with linkages to biodiversity via trophic cascades.

A graduate degree concentration is available as part of the Trophic Cascades Program. Designed for students interested in topics that intersect forestry and wildlife science, this concentration provides an interdisciplinary approach to attaining sustainability of both forest and wildlife resources. Available within the Department of Forest Ecosystems and Society, the forestry/wildlife degree concentration involves dynamic interaction with faculty in both the College of Forestry and the Department of Fisheries & Wildlife. For more information, go to Graduate Studies.


Participating Faculty/Scientists

  • William J. Ripple, Professor, Dept. of Forest Ecosystems and Society; Director, Trophic Cascades Program.
    (More info...)
  • Robert L. Beschta, Professor Emeritus, Dept. of Forest Ecosystems and Society.
    (More info...)
  • Matthew G. Betts, Assistant Professor, Dept. of Forest Ecosystems and Society.
    (More info...)
  • James A. Estes, Professor, University of California, Santa Cruz.
    (More info...)
  • Matt Hayward, School of Environment, Natural Resources and Geography, Bangor.
    (More info...)
  • Jan Kamler, Research Associate, Wildlife Conservation Research Unit, University of Oxford.
    (More info...)
  • Graham Kerley, Centre for African Conservation Ecology
    (More info...)
  • Mike Letnic, Associate Professor, School of Biological, Earth and Environmental Sciences.
    (More info...)
  • David Macdonald, WildCRU, Professor, Zoology, University of Oxford.
    (More info...)
  • Taal Levi, Assitant Professor, Department of Fisheries and Wildlife, Oregon State University.
    (More info...)
  • Michael P. Nelson, Professor, Department of Forest Ecosystems and Society.
    (More info...)
  • Thomas Newsome, Postdoctoral Scholar.
    (More info...)
  • Luke Painter, Instructor, Department of Fisheries and Wildlife, Oregon State University.
    (More info...)
  • Arian Wallach, Charles Darwin University, School of Environment.
    (More info...)
  • Aaron Wirsing, Associate Professor, School of Environmental and Forest Sciences, University of Washington.
    (More info...)
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


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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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