| Summary: | Radio-collared moose (Alces alces) in central Sweden were tracked during fall and spring migrations from 1980 through 1984. Moose were located within an average of ± 6 days (SD=5.6) of 163 migration onsets. Adult moose (>2 yr) began fall migration at an average snow depth of 42 cm (SD=9.2) and approximately one month after the first snow accumulated on the summer range. Snow depth and days of snow accumulation at onset of fall migration were similar between years (p>0.05), however, adult moose migrated at significantly different seasonal dates in different years (p<0.05). Adult moose began spring migration at an average snow depth of 6 cm (SD=12.4). However, timing in relation to snowmelt was different in different years (p<0.05) as were seasonal dates of spring migration (p<0.01). Subadults (1-2 yr) had earlier fall, but similar spring migration onsets (p>0.05), than older moose. Unlike adult moose, yearlings and two year olds had fall and spring migration onsets that appeared to be related to the seasonal date.
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