LITERATURE CITED 



American Ornithologists' Union. 1983. Check-list of North American birds, 6th edition. Allen 

 Press, Lawrence, Kans. 877 pp. 



Ashley, J. 1992. A summary of documented harlequin duck observations in Glacier National Park, 

 1874-1992. Unpubl. Report, Glacier Natl. Park, West Glacier, Mont. 19 pp. 



Bellrose, F.C. 1976. Ducks, geese and swans of North America. Stackpole Books, Harrisburg, 

 Penn. 540 pp. 



Bengtson, S.A. 1966. Field studies on the harlequin duck in Iceland. Wildfowl Trust Ann. Rep. 

 17:79-94. 



Bengtson, S.A. 1972. Breeding ecology of the harlequin duck Histrionicus histrionicus (L.) in 

 Iceland. Omis Scand. 3:1-19. 



Bengtson, S.A. and S. Ulfstrand. 1971. Food resources and breeding frequency of the hariequin 

 duck, Histrionicus histrionicus, in Iceland. Oikos 22:235-239. 



Carlson, J.C. 1990. Results of hariequin duck (Histrionicus histrionicus) surveys in 1990 on the 

 Flathead National forest, Montana. Mont. Nat. Heritage Prog., Helena. 32 pp. 



Cassirer, E.F., A. Breault, P. Clarkson, D.L. Genter, R.I. Goudie, B. Hunt, S. C. Latta, G.H. 

 Mittelhauser, M. McCoUough, G. Schirato, and R.L. Wallen. 1993. Status of hariequin 

 ducks (Histrionicus histrionicus) in North America. Report of the Harlequin Duck 

 Working Group. 83 pp. 



Cassirer, E.F. and C.R. Groves. 1989. Breeding ecology of harlequin ducks (Histrionicus 



histrionicus) on the Kaniksu National Forest, Idaho. Idaho Dept. Fish Game, Nongame 

 Endangered Wildl. Prog. 48 pp. 



Cassirer, E.F. and C.R. Groves. 1990. Distribution, habitat use, and status of hariequin ducks in 

 northern Idaho, 1990. Idaho Dept. Fish Game, Nongame Endangered Wildl. Prog. 54 pp. 



Cassirer, E.F. and C.R. Groves. 1991. Harlequin duck ecology in Idaho: 1987-1990. Idaho 

 Dept. Fish Game, Nongame Endangered Wildl. Prog. 93 pp. 



Clarkson, P. 1992. A preliminary investigation into the status and distribution of harlequin ducks 

 in Jasper National Park. Unpubl. Tech. Rep. Heritage Resource Conservation, Jasper 

 National Park. 65 pp. 



Diamond, S. and P. Finnegan. 1992. Harlequin duck ecology on Montana's Rocky Mountain 



Front. USDA, Lewis and Clark Natl. For., Rocky Mountain Ranger Dist., Choteau, MT. 

 45 pp. 



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