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Population Survey of the Nahanni Wood Bison Population, March 2011

The Nahanni wood bison (Bison bison athabascae) population was established in 1980 with the release of 28 wood bison from Elk Island National Park (EINP) into the Nahanni Butte area of their historical range. Supplemental releases in 1989 and 1998 of 12 and 59 individuals bolstered the population. Limited aerial surveys were conducted in the 1990s to monitor the population, but the first systematic aerial line transect survey to estimate the population size was not conducted until March 2004. In March 2011 we flew a similar aerial line transect survey to estimate population size; more bison were observed being distributed throughout the ca. 7,600 km survey area. We used radio collared bison to provide a sightability correction factor for the 2011 survey. The population estimate was 431 bison (+ 213 95%CI; CV=0.247), which was similar to the 403 bison (+ 256 95%CI; CV=0.320) estimated from the 2004 survey. In addition to the 186 bison, 79 moose and one otter were observed during the survey. ii Table of