Abstract
The distribution limits ofCrocidura russula (Hermann, 1780) andC. leucodon (Hermann, 1780) were investigated during an interval of 25 years in the bottom of the Rhone valley above Lake Geneva, Switzerland (total data set: 105 spatio-temporal occurrences, 1137 shrews). In 1975, the contact zone between the two species was situated in the region of Martigny. In 1999/2000, new sampling revealed three results: (1) The contact zone showed an upward shift of about 25 km. (2) In the expanded range ofC. russula, the resident species has totally disappeared (confirmed by owl pellets analysis). (3) This demonstrates a dominance ofC. russula overC. leucodon. Three hypotheses which may explain the range expansion ofC. russula were evaluated: (1) habitat modification favouring linear dispersal due to the construction of a highway; (2) temporal event favoured by climate fluctuations, or (3) ongoing postglacial colonisation of Europe. Hypothesis 1 was rejected, because the progression of the shrews anticipated the construction. Hypothesis 3 received only weak support because range limits ofC. russula in the region of Nice have been stable for thousands of years. Therefore hypothesis 2, admitting that ongoing climate change has facilitated range expansion, is the most probable.
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Vogel, P., Jutzeler, S., Rulence, B. et al. Range expansion of the greater white-toothed shrewCrocidura russula in Switzerland results in local extinction of the bicoloured white-toothed shrewC. leucodon . Acta Theriol 47, 15–24 (2002). https://doi.org/10.1007/BF03193562
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DOI: https://doi.org/10.1007/BF03193562