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Counts of Harlequin Ducks breeding on the upper Torrent River increased throughout the 1990s, and the estimated population growth rate for the Torrent River birds was very similar to the growth rate for birds wintering at Cape St. Young remain in the upper watershed until fledging in late August to mid-September. Nesting and brood rearing appear to take place primarily in proximity to spring-pair activity, although movements of more than ten km were observed.
Pairs concentrate in the upper watershed that drains the Long Range Barrens ecoregion. Harlequin Ducks arrive on the Torrent River as soon as ice-out permits in early to late May. This reach of the watershed was proposed for hydro-electrical development in the 1990s. Harlequin Ducks ( Histrionicus histrionicus) breeding on the upper Torrent River of the northern peninsula of Newfoundland were studied from 1993 to 2002.
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