Habitat use and potential interactions between the house mouse and lesser white-toothed shrew on an island undergoing habitat restoration |
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Authors: | Michel Pascal Olivier Lorvelec Frédéric Bioret Pierre Yésou Daniel Simberloff |
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Institution: | 1. INRA, équipe écologie des Invasions Biologiques, UMR écologie et Santé des écosystèmes, Campus de Beaulieu 35, 042, Rennes Cedex, France 2. Institut de Géoarchitecture, Université de Bretagne Occidentale, UFR Sciences et Techniques, CS 93837-29 238, Brest Cedex 3, France 3. Office National de la Chasse et de la Faune Sauvage, 53, Rue Russeil, 44 000, Nantes, France 4. Department of Ecology and Evolutionary Biology, University of Tennessee, 37 996, Knoxville, TN, USA
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Abstract: | To forecast the potential impact of plant community and dry-stone wall restoration on an insular population of the lesser
white-toothed shrewCrocidura suaveolens Pallas, 1811, shrew and house mouseMus musculus Linnaeus, 1758 abundances were assessed in 3 anthropogenic habitats on Béniguet Island, Brittany, France, by a standardised
annual trapping system checked yearly for 9 years and in 6 “natural” habitats by trap-lines. The standardised trapping system
showed that abundances of both species fluctuated synchronously for nine years, suggesting that interactions between the species
had little impact if any on abundances. Mice were trapped in all habitats, but shrews only in “stone” habitats except for
rare occurrences in one damp depression. Ruderal habitat was rarely used by either species. Data suggest that on Béniguet
Island: (1)M. musculus is associated with anthropogenic habitats but is not as strictly tied to them as at nearby continental sites; (2)C. suaveolens is synanthropic, as has been reported in continental northern France; (3) shingle beaches and seashore food resources are
particularly important forC. suaveolens; (4) the relationship betweenC. suaveolens andM. musculus could not be determined by the experiments and, if it exists at all, appears to be more competitive than predatory. Grassland
restoration is unlikely to affect shrew populations. Dry-stone wall restoration may temporarily affect shrews but should ultimately
benefit them. |
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