NOTE DeMaster et al.: Effect of sea state on estimates of abundance of Delphmapterus leucas 
201 
Harwood, L. A., S. Innes, P. Norton, and M. C. S. Kingsley. 
1996. Distribution and abundance of beluga whales in 
the Mackenzie estuary, southeast Beaufort Sea, and west 
Amundsen Gulf during late July 1992. Can. J. Fish. 
Aquat. Sci. 53:2262-2273. 
Laake, J. L., S. T. Buckland, D. R. Anderson, and K. P. Burnham. 
1994. Distance user’s guide. Colorado Cooperative Fish 
and Wildlife Research Unit, Colorado State Univ., Ft. Col- 
lins, CO, 84 p. 
Lowry, L. F., J. J. Burns, and K. J. Frost. 
1989. Recent harvests of beluga whales, Delphinapterus 
leucas, in western and northern Alaska and their poten- 
tial impact on provisional management stocks. Rep. Int. 
Whal. Comm. 39:335-339. 
Reeves, R. R. 
1990. An overview of the distribution, exploitation and con- 
servation status of belugas, worldwide. In For the future 
of the beluga: proceedings of the international forum for 
the future of the beluga, (J. Prescott and M. Gauquelin, 
eds.), p. 47-58. Univ. Quebec Press, Quebec, Canada. 
Richard, P. R., J. R. Orr, and D. G. Barber. 
1990. The distribution and abundance of belugas, Delphi- 
napterus leucas, in eastern Canadian subarctic waters: a 
review and update. In Advances in research on the beluga 
whale, Delphinapterus leucas (T. G. Smith, D. J. St. Aubin, 
and J. R. Geraci, eds.), p. 23-38. Can. Bull. Fish. Aquat. 
Sci. 224. 
Seber, G. A. F. 
1973. The estimation of animal abundance. Hafner Press, 
New York, NY, 506 p. 
Wade, P. R. 
1998. Calculating limits to the allowable human-caused 
mortality of cetaceans and pinnipeds. Mar. Mammal Sci. 
14:1-37. 
