Distribution And Status of the Harlequin Duck Histrionicus Histionicus Sic On
Distribution And Status of the Harlequin Duck Histrionicus Histionicus Sic On
Darrell Markum
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Boulder Gallatin year mean^ max (mo)'' min(mo)'^ mean^ max (mo)'' min(mo)'^ 1981 532 2722 (jun) 76(sep) 860 3211(jun) 466(sep) 1982 626 2916(jun) 288 (sep) * * * 1983 543 2419(jun) 221(sep) * * * 1984 622 2628(jun) 212 (sep) * * * 1985 383 1441(jun) 172 (aug) 717 2048 (may) 506(sep) 1986 471 2692(jun) 110 (aug) 884 3691(jun) 522 (sep) 1987 330 1152 (may) 111 (sep) 587 1565 (may) 426(sep) 1988 393 2020(jun) 28 (sep) 655 2191 (may) 364 (sep) 1989 455 2366(jun) 111 (sep) 672 2477(jun) 401(sep) 199...0 474 2206(jun) 119 (sep) 785 2904 (jun) 418(sep) a- annual mean (all days), b- highest monthly mean for period May - Sept. , c- lowest monthly mean for period May - Sept. , * - no data. DISCUSSION The number of harlequin duck observations was too small to make meaningful comparisons or predictions of habitat use patterns. However, the observations that were made compare favorably with the results obtained from a study in GTNP (Wallen 1987) . For example, no observations were made in locations where both stream banks approached the water at >45 degree angle or 17 where bank vegetation was open.
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