What causes the seasonal shift in the diet of voles from green vegetation to bark and roots?
Answer
The scarcity of soft green material during autumn and winter
Voles are opportunists that prioritize easy-to-access green matter whenever it is available during the warmer months. As temperatures drop and autumn progresses, this preferred soft vegetation becomes scarce. This environmental change forces the voles to adapt their feeding strategy. To survive the lean winter period, they must switch to tougher, more durable food items like woody bark and subsurface items, which require more exertion to obtain but provide the necessary energy density to survive cold conditions.
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