Harlequin Duck Histrionicus histrionicus distribution and stonefly nymph availability in the Maligne Valley watershed – a preliminary study
نویسنده
چکیده
The relationship between Harlequin Duck Histrionicus histrionicus distribution and stonefly (Plecoptera) nymph availability in the Maligne Valley watershed, Jasper National Park, Canada, was investigated from 1999 to 2000. Invertebrate sampling and duck counts were concentrated in the Maligne Lake Outlet (MLO), Middle Maligne River and Lower Maligne River. Harlequin Ducks were more likely to use the two sites with high nymph availability (MLO and Lower Maligne) than the site with low nymph availability (Middle Maligne). The relationship between Harlequin Duck distribution and other invertebrates was less consistent. These results suggest that stonefly nymphs play an important role in the distribution of Harlequin Ducks in the Maligne watershed.
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