Proceedings of the Seventh Mountain Lion Workshop
Proceedings of the Seventh Mountain Lion Workshop
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