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How does the mule deer migration respond to snowfall in mountain habitats?
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Migration
A herd of common wildebeest (Connochaetes taurinus) migrating across a dusty savanna in Africa. The animal is a keystone species (i.e., a species with a disproportionately large effect on its biological community) in plains and acacia savanna ecosystems from southeastern Africa to central Kenya.
Mule deer (Odocoileus hemionus) populations that inhabit mountainous regions engage in seasonal migrations to optimize their access to food resources throughout the year.1
Their movement is directly influenced by snowfall patterns:
- Autumn Departure: As the first snow falls in high-altitude summer pastures, the deer migrate to lower elevations to avoid the harsh conditions and limited forage availability associated with winter snow cover.1
- Spring Return: The deer return to their higher-altitude summer ranges at the end of winter, typically several weeks after the snow has melted and the new vegetation has become accessible.1
This migratory behavior allows mule deer to exploit seasonal changes in different habitats, ultimately supporting larger populations than would be possible if they remained in a single area year-round.1