American Bison - Buffalo Field Campaign

y winter severity and the area of wildland fires (Turner et al.
1994; Wallace et al. 2004).
Survival of calves to six months is more than 90% in plains bison
herds in protected areas, or those that are only lighted hunted in
the absence of predators and diseases (Table 6.5). The survival
rate for the first six months of life in the presence of wolves at
WBNP was 47% (Table 6.5; Bradley and Wilmshurst 2005). At
the SRL survival rates for the first six months of life increased
from 6% to 30% coincident with a decline in wolf abundance
(Table 6.3; Calef 1984). Survival through the first year of life, in
the presence of wolves, has been estimated at 10% and 41% for
bison at WBNP (Table 6.5; Carbyn et al. 1993; Fuller 1962). Calf
survival through the first year of life was 95% for an increasing
Table 6.5 Age-specific survival rates (%) of plains and wood bison at select locations (mm = male; ff = females).
Subspecies
Plains bison
Wood bison
Location and
Years
Henry
Mountains, UT