Bison and Elk in Yellowstone National Park - Linking Ecosystem, Animal Nutrition, and Population Processes
Bison and Elk in Yellowstone National Park - Linking Ecosystem, Animal Nutrition, and Population Processes Part 3 - Final Report to U.S. Geological Survey Biological Resources Division Bozeman, MT Project: Spatial-Dynamic Modeling of Bison Carrying Capacity in the Greater Yellowstone Ecosystem: A Synthesis of Bison Movements, Population Dynamics, and Interactions with Vegetation Michael B. Coughenour Natural Resource Ecology Laboratory Colorado State University Fort Collins, Colorado December 2005 INTRODUCTION Over the last three decades bison in Yellowstone National Park have increased in numbers and expanded their ranges inside the park up to and beyond the park boundaries (Meagher 1989a,b, Taper et al. 2000, Meagher et al. 2003). Potentially, they have reached, if not exceeded the capacity of the park to support them. The bison are infected with brucellosis, and it is feared that the disease will be readily transmitted to domestic cattle, with widespread economic repercussions. Brucellosis is an extremely damaging disease for livestock, causing abortions and impaired calf growth. After a long campaign beginning in 1934 and costing over $1.3 billion (Thorne et al. 1991), brucellosis has been virtually eliminated from cattle and bison everywhere in the conterminous United States except in the Greater Yellowstone Ecosystem. Infection of any livestock in Montana, Idaho, or Wyoming would result in that state losing its brucellosis-free status, leading to considerable economic hardships resulting from intensified surveillance, testing, and control (Thorne et al. 1991). Management alternatives that have been considered include hazing animals back into the park, the live capture and holding of animals that leave the park, and culling or removal from within the park.
[Show full text]