ABSTRACT 



Breeding pair surveys for Harlequin Ducks were done on 409 km of 20 streams during rJ 

 May and June, 1993; a total of 42 Harlequins (27 males, 15 females) were seen on 6 streams. 

 Brood surveys were done on 377 km of 21 streams during July and August, 1993; a total of 78 

 Harlequins (19 females, 59 young in 21 broods) were seen on 9 streams. Harlequins were 

 reported on an additional 4 streams. Reproductive success, on streams surveyed both for pairs 

 and broods, averaged 0.40 broods per female. Success in the North Fork Flathead drainage was 

 substantially lower (0.32 broods per female) than in the lower Clark Fork drainage (0.60 broods 

 per female). Brood size at or near fledging (Class III) averaged 2.86; August brood sizes were 

 consistent among all drainages. No new breeding streams were confirmed in 1993. No birds 

 were seen during pair (May) or brood (August) surveys of Sullivan Creek, which had Harlequins 

 in 1992. 



We continued banding Harlequin Ducks in the Flathead and Clark Fork drainages. Sixty- 

 eight Harlequins (13 adult males, 14 adult females, and 41 juveniles) were marked on 7 streams. 

 This brings the total number of Harlequin Ducks banded in Montana since 1991 to 159 (22 adult 

 males, 34 adult females, and 103 juveniles). We observed 20 previously marked birds on streams. 

 The banding program, while small in scale for waterfowl, is providing a significant tool for local 

 monitoring and identifying coastal areas where Montana breeding birds molt and winter. 



Six movements detected in 1993 were interesting. A male marked on McDonald Creek, 

 Glacier National Park, on 6 May 1993, was captured on Hornby Island, along the east coast of 

 Vancouver Island, British Columbia on 5 August 1993. This was the first record of a bird marked 

 in Montana being relocated on the coast. On 14-15 March 1994 three Harlequins were observed 



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