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Bighorn Sheep (Ovis canadensis) populations throughout much of western North America have shown irregular cycles of abundance characterized by periods of rapid growth followed by drastic declines. The proximate cause in the majority of dieoffs is attributed to the pathogen Pasteurella (spp.), which causes pneumonia and death in infected animals. Pneumonia outbreaks may be a consequence of pathogen transmission from domestic sheep or goats to bighorns, but outbreaks may also occur in the apparent absence of bighorn-livestock interaction. Causal agents can be pathogens commonly present in animals with no clinical signs of pneumonia, suggesting that the disease is predisposed by certain ecological or environmental conditions. This project examines factors potentially predisposing bighorn sheep to population declines by examining the correlation between bighorn population trends and environmental and biological factors...
Monello, R.J., Murray, D.L.; Cassirer, E.F.. 1999. A Range-wide Evaluation of the Population Dynamics and Ecological Factors Associated With Bighorn Sheep Dieoffs (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks. Conference Biology & ManagementProceedings. Vol. 1
Other Identifier: University College of the Cariboo
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