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Trophic Cascades in Terrestrial Ecosystems 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.


Watch the YouTube video - Predators, with Bill Ripple.

View the powerpoint with audio from Bill Ripple's presentation, Using Large Carnivores for Restoring Western Ecosystems, at Utah State University.

Listen to Bill Ripple on Access Utah (Utah Public Radio) about his long term study of the ecosystem in Yellowstone National Park

Download the Lords of Nature high school study guide.

Watch the Oregon Field Guide special, Wolves in Oregon?. Bill Ripple and his Yellowstone research are featured at minutes 14.36-17.25.

View the illustration, Before & After Wolves, featured in the March 2010 issue of National Geographic

Listen to Mess O' Predators, a segment from The Discovery Files which features new advances in science and engineering sponsored by the National Science Foundation.

Visit the official website for the book Where the Wild Things Were: Life, Death, and Ecological Wreckage in a Land of Vanishing Predators.

Watch the Bio Bulletin video entitled "Yosemite: Biodiversity in the balance?" from the American Museum of Natural History. (Requires Adobe Flash 9)

Visit The Environment Report's website to view it's story and corresponding audio report entitled "Wolves Make Mark On Yellowstone."

Find out about NATURE's documentary In the Valley of the Wolves which premiered Sunday, November 4 at 8 p.m. (ET) on PBS.

Watch the Bio Bulletin video entitled "Wolves Help Aspen Trees Grow." from the American Museum of Natural History. (Requires Adobe Flash 9)

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Oregon State is No. 1 in conservation biology

See photos of Bill Ripple's and Bob Beschta's research activites in Yellowstone and Zion national parks.

Listen to Dr. Ripple's interview with the BBC on the positive impact of wolves upon the ecosystem of Yellowstone Park (mp3/3MB)

Participating Faculty/Scientists

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Support for the Leopold site is provided by: Dept. of Forest Resources, OSU,
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