Diseases
Publicly-owned free-ranging herds in Alberta, British Columbia, Yukon, and the Northwest Territories comprise 90% of existing Wood Bison, although six smaller public and private captive breeding herds with conservation objectives comprise approximately 10% of the total (n ≈ 900). These captive herds and two large isolated free-ranging herds in the Yukon and Northwest Territories all derive from disease-free and morphologically representative founding stock from northern Wood Buffalo National Park in northeastern Alberta and southern Northwest Territories. These captive herds are particularly important for conservation and recovery purposes, because the larger free-ranging herds in and around Wood Buffalo National Park were infected with bovine brucellosis and tuberculosis after 7,000 Plains Bison (Bison bison bison) were trans-shipped by barge from Buffalo National Park near Wainwright, Alberta in the 1920s.
Diseases including brucellosis and tuberculosis remain endemic in the free-ranging herds in and around Wood Buffalo National Park. The diseases represent a serious management issue for governments, various local Aboriginal groups, and the cattle industry rapidly encroaching on the park's boundaries. Disease management strategies and initiatives began in the 1950s, and have yet to result in a reduction of the incidence of either disease despite considerable expenditure and increased public involvement.
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