Population demography of Peary caribou and muskox on Banks Island, N.W.T., 1982-1992

  • J.A. Nagy
  • N.C. Larter
  • V.P. Fraser
Keywords: Peary caribou, muskox, Banks Island, population demography

Abstract

The Peary caribou population (excluding calves) on Banks Island declined from 6 970 (± 1133) in 1982 to 897 (± 151) in 1991. The 1992 estimate was 1 005 (± 133). Percent calves in the population varied among years (range 3.2¬31.1%). Mean group sizes dropped from 5.0 in 1985 to a low of 2.0 in 1989 and 1991. Median group sizes were significantly larger between 1982 and 1987 than between 1989 and 1992 (P<0.001). Large post-calving aggregations prevalent on the NW portion of Banks Island in the early 1980's were absent by the 1990s. The muskox population (excluding calves), increased from 29 168 (± 2104) in 1985 to 52 959 (± 2240) in 1992. Percent calves in the population varied among years, (range 11.8-17.1%). These values may be underestimates, because calves are small and muskox groups sometimes form defensive circles in response to aircraft. Muskoxen were distributed throughout the island during all surveys; however, the greatest increase in density occurred in the southern parts of the island.

Author Biography

J.A. Nagy

 

 

Published
1996-01-01
How to Cite
NagyJ., LarterN., & FraserV. (1996). Population demography of Peary caribou and muskox on Banks Island, N.W.T., 1982-1992. Rangifer, 16(4), 213-222. https://doi.org/10.7557/2.16.4.1245