SUMMARY 



Harlequin duck surveys were conducted on 12 streams in the 

 Gallatin National Forest and two streams in the Custer National 

 Forest during the period May - August, 1990. Most stream sections 

 were surveyed at least twice, once during the early part of the 

 season and a second time later in the season. Survey sections were 

 selected by size and gradient. Harlequin ducks were observed only 

 on a short section of the Boulder River on three separate days. A 

 total of 18 harlequins were seen but these probably represent only 

 15 individual ducks as some probably were seen more than once. The 

 breakdown of observations is as follows: 19 May - one pair; 6 June 

 - five adult males, one pair, and one adult female; 23 August - 

 eight individuals of undetermined sex and age. Behavioral 

 observations included swimming, loafing, preening, feeding, and 

 mating. The number of harlequin observations was too small to make 

 meaningful comparisons or predictions of habitat use patterns. The 

 observations that were made compare favorably with results obtained 



