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Proceedings of the Seventh Mountain Lion Workshop

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122<br />

COUGAR ECOLOGY AND COUGAR-WOLF INTERACTIONS IN YELLOWSTONE<br />

NATIONAL PARK: A GUILD APPROCH TO LARGE CARNIVORE CONSERVATION<br />

TONI K. RUTH, Associate Conservation Scientist, Wildlife Conservation Society, 2023 Stadium<br />

Dr. Suite 1A, Bozeman, MT 59030, USA, email: truth@montanadsl.net<br />

POLLY C. BUOTTE, Research Assistant, Wildlife Conservation Society, 2023 Stadium Dr.<br />

Suite 1A, Bozeman, MT 59030, USA, email: polly_thornton@hotmail.com<br />

HOWARD B. QUIGLEY, Beringia South, 3610 W. Broadwater, Suite 111, Bozeman, MT<br />

59715, USA<br />

MAURICE G. HORNOCKER, Senior Scientist, Wildlife Conservation Society, 2023 Stadium<br />

Dr. Suite 1A, Bozeman, MT 59030, USA<br />

Abstract: Successful restoration <strong>of</strong> large carnivores in <strong>the</strong> Nor<strong>the</strong>rn Rockies and <strong>the</strong> concomitant<br />

increase in carnivore abundance and distribution will challenge humans as human development<br />

increases throughout <strong>the</strong> West. Presently, <strong>the</strong>re is little understanding <strong>of</strong> how<br />

reintroduction/reestablishment <strong>of</strong> endangered large carnivores (wolves and grizzly bears) may<br />

affect <strong>the</strong> population characteristics, distribution, and behavior <strong>of</strong> o<strong>the</strong>r large carnivore<br />

populations, such as cougars. If restored wolves limit cougar populations in number or<br />

distribution, this limitation may have synergistic effects with current relaxation <strong>of</strong> cougar<br />

hunting regulations and rapid development. An added stress such as low prey availability (e.g.<br />

caused by hard winter or disease) could fur<strong>the</strong>r impact populations. Understanding competitive<br />

relationships between large carnivores and <strong>the</strong> role that habitat and prey availability play is<br />

paramount to predicting and preparing for changes in <strong>the</strong> Greater Yellowstone region. In order<br />

to assess population-level effects <strong>of</strong> wolf (Canis lupus) reestablishment on cougars (Puma<br />

concolor) in and near Yellowstone National Park (YNP), we initiated a Phase II study <strong>of</strong> YNP<br />

cougars in 1998. The study is designed to examine <strong>the</strong> characteristics <strong>of</strong> <strong>the</strong> cougar population<br />

including: sex and age structure, density, reproductive and survival rates, dispersal and<br />

recruitment events, rate <strong>of</strong> predation on prey, and spatial and temporal movements. These<br />

parameters will be compared with analogous estimates made prior to <strong>the</strong> wolf restoration event<br />

in 1995 (Phase I data, Murphy 1998) and similar parameters documented for <strong>the</strong> wolf population<br />

to assess competition and resource partitioning between <strong>the</strong> two species. During 1998-2002, 56<br />

cougars were captured in and adjacent to areas used by 35-88 wolves within 3-5 wolf packs on<br />

<strong>the</strong> Nor<strong>the</strong>rn Yellowstone Study Area, Montana and Wyoming. A sample <strong>of</strong> 3 to 10 radiocollared<br />

wolves was maintained within each wolf pack by <strong>the</strong> Yellowstone Wolf Restoration<br />

program. In this paper we summarize current research findings relative to cougar population<br />

changes pre- and post-wolf reintroduction, species interactions, and discuss future study<br />

direction.<br />

PROCEEDINGS OF THE SEVENTH MOUNTAIN LION WORKSHOP

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