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In two field experiments the feeding preference of voles (Microtus agrestis and Clethrionomys glareolus) and hares (Lepus timidus), offered winter dormant shoots/branches of three deciduous tree species, were determined and related to nutritional quality and concentration of phenolics. Both the voles and the hares consumed more rowan (Sorbus aucuparia)/aspen (Populus tremula) (vole and hare experiment, respectively) than birch in the patches containing birch (Betula pubescens) together with rowan/aspen and slightly but not significantly more birch than alder (Alnus incana) in the birch/alder patches. Further-more, the overall concumption in both patch types was highest in rowan/aspen (vole and hare experiment, respectively) and lowest in alder, with birch being intermediate
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Hjältén et al. (1992) studied this question.
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