Small urban woodlands as biodiversity conservation hot-spot: a multi-taxon approach |
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| Authors: | Solène Croci Alain Butet Anita Georges Rahim Aguejdad Philippe Clergeau |
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| Institution: | (1) INRA SCRIBE, Campus de Beaulieu, Av. Général Leclerc, 35042 Rennes Cedex, France;(2) CAREN UMR CNRS 6553 ECOBIO, Université Rennes 1, Campus de Beaulieu, Av. Général Leclerc, 35042 Rennes Cedex, France;(3) UMR CNRS 6554 COSTEL LETG, Université Rennes 2, Place du Recteur H. Le Moal, 35043 Rennes Cedex, France;(4) Muséum National d’Histoire Naturelle, Ecologie et gestion de la biodiversité, UMR 5173, 55 rue Buffon, 75005 Paris, France |
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| Abstract: | To evaluate the importance of urban woodlands to serve as potential sites for biodiversity conservation, we analysed bird,
carabid beetle and small mammal community responses to urbanisation at different spatial scales. We analysed the relationships
between the variations of the structure (species richness S, diversity H′ and dominance D) of animal communities of woodlands
distributed along a rural–urban gradient, and the variations along this same gradient of (1) the vegetation within woodlands,
(2) the landscape at 100 m and (3) 600 m around the woodlands. We identified the spatial scales whose variations along the
gradient most affected each animal community structure, and characterised community responses to these variations. Our results
showed that urbanisation affected taxa differently according to their dispersal ability. Carabid beetles, less mobile, seem
to be sensitive to increasing fragmentation and built surfaces from periurban to town centre which could make their movement
within the urban landscape difficult. Birds, mobile species, seem to be more sensitive to variations of the vegetation structure
within woodlands from periurban to town centre that could affect their capacity to maintain in habitat patches. Although our
study did not allow relating the small mammal community structure to urbanisation, it suggests that this taxa is sensitive
to urban local disturbances. A relevant management scale of woodlands can be specified for each taxa conservation. Urban woodlands
accommodate over 50% of the species present in periurban woodlands, and effective management could enhance this number. Woodlands
seem to be a good choice for promoting biodiversity conservation in towns. |
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| Keywords: | Birds Carabid beetles Dispersal abilities Habitat Landscape Small mammals Urbanisation |
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