The Seasonality of a Migratory Moose Population in Northern Yukon
THE SEASONALITY OF A MIGRATORY MOOSE POPULATION IN NORTHERN YUKON Dorothy Cooley1,5, Heather Clarke1, Shel Graupe2,6, Manuelle Landry-Cuerrier3, Trevor Lantz4, Heather Milligan1, Troy Pretzlaw3,7, Guillaume Larocque3,8, and Murray M. Humphries3 1Department of Environment, Yukon Government, Whitehorse, YT, Canada, Y1A 2C6; 2Vuntut Gwitchin Government, Old Crow, YT, Canada, Y0B 1N0; 3Natural Resource Sciences, Macdonald Campus, McGill University, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9; 4Environmental Studies, University of Victoria, Victoria, BC, Canada, V8W 2Y2; 5Teslin Tlingit Council, Teslin, YT, Canada, YOA 1B0; 6SGS Canada Inc, Edmonton, AB, Canada, T6E 4N1; 7Parks Canada, Annapolis, NS, Canada, B0T 1B0; 8Québec Centre for Biodiversity Science, Montréal, QC, Canada, H3A 1B1 ABSTRACT: At the northern edge of their North American range, moose (Alces alces) occupy treeline and shrub tundra environments characterized by extreme seasonality. Here we describe aspects of the seasonal ecology of a northern Yukon moose population that summers in Old Crow Flats, a thermokarst wetland complex, and winters in surrounding alpine habitat. We collared 19 moose (10 adult males and 9 adult females) fitted with GPS radio-collars in Old Crow Flats during summer, and monitored their year-round habitat use, associated environmental conditions, and movements for 2 years. Seventeen of 19 moose were classified as migratory, leaving Old Crow Flats between August and November and returning in April to July, and spent winter in alpine habitats either northwest (n = 8), west (n = 4), or southeast (n = 5) of Old Crow Flats. The straight-line migration distance between summer and winter ranges ranged from 59 to 144 km, averaging 27 km further for bulls than cows.
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