Vole preference forSalix caprea,S. repens, and their F1, F2, and backcross hybrids

Abstract

In recent years, the influence of plant hybridization on plant–animal interactions has become an important issue; however, these studies have mainly focused on insects or slugs and to a large degree ignored mammalian herbivores despite their importance in many ecosystems. This study aims to determine the preference of voles for pureSalix caprea,S. repens, and their F1, F2, and backcross hybrids to evaluate whether voles select against hybrids in natural willow populations. To address this, we conducted two field studies and a cafeteria experiment in the laboratory with bank voles (Clethrionomys glareolus). We found no strong indications of reduced resistance in any of the hybrid taxa. Voles damaged moreS. repensthanS. capreaindividuals. There was a general decreasing trend of utilization from pureS. repensto pureS. caprea, hybrid taxa being intermediate between the parents. Thus, voles seemingly do not have a more detrimental effect on hybrid fitness than on the fitness of pure individuals and probably will not select against hybrids in these willows populations.