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Ecological corridors also operate in an urban matrix: A test case with garden shrews

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Abstract

The fragmentation of landscapes, induced by the growing urbanisation, is a major cause of biodiversity loss. Ecological corridors are landscape elements that make up for the negative effects of habitat fragmentation in agricultural or natural landscapes. However, their effectiveness have been rarely assess in an urban context. To do so, we analysed shrews in woodlots, corridors and domestic gardens that are connected or disconnected from a corridor. Indeed, these mammals are very sensitive to fragmentation and could play an important ecological role even in small and isolated areas such as domestic gardens. Ninety-seven shrews, from three species were trapped. In our study, Sorex coronatus, Sorex minutus and Crocidura russula were not widely distributed and mainly occurred in woodlots, corridors and connected gardens. In gardens, shrew occurrences were mainly determined by landscape configuration with negative effects of the distance to the corridor and the distance to the woodlot, stronger for C.russula than Sorex species. At the local scale, garden management and vegetation showed a positive effect mainly for Sorex species. The quality of gardens seems good enough to permit the co-occurrence of several species of shrews and thus competition was not identified as a major process for determining the occurrence. We showed that, as in other ecosystems, ecological corridors in urban context can play an effective role for the distribution of organisms with low dispersal capabilities and should be develop in planning strategies.

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Acknowledgments

We thank Ms Fiona Pujalte-Johnson for the language revision. We also thank François Chiron for his help in determination. The Study was supported by the French ministry of the environment and by the ANR “Trame Verte Urbaine”.

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Correspondence to Alan Vergnes.

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ESM 1

Details of the Principal Component Analysis (PCA) computed on the local and landscape variables (DOCX 77.0 KB)

ESM 2

Table of correlations between environmental variables (DOC 67.0 KB)

ESM 3

List and details of all the Generalized Liner Models computed on the occurrence of all shrews and on each species separately (XLS 39.0 KB)

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Vergnes, A., Kerbiriou, C. & Clergeau, P. Ecological corridors also operate in an urban matrix: A test case with garden shrews. Urban Ecosyst 16, 511–525 (2013). https://doi.org/10.1007/s11252-013-0289-0

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