A multi-species approach for assessing the impact of land-cover changes on landscape connectivity
- First Online:
Land-cover changes (LCCs) could impact wildlife populations through gains or losses of natural habitats and changes in the landscape mosaic. To assess such impacts, we need to focus on landscape connectivity from a diachronic perspective.
We propose a method for assessing the impact of LCCs on landscape connectivity through a multi-species approach based on graph theory. To do this, we combine two approaches devised to spatialize the variation of multi-species connectivity and to quantify the importance of types of LCCs for single-species connectivity by highlighting the possible contradictory effects.
We begin with a list of landscape species and create virtual species with similar ecological requirements. We model the ecological network of these virtual species at two dates and compute the variation of a local and global connectivity metric to assess the impacts of the LCCs on their dispersal capacities.
The spatial variation of multi-species connectivity showed that local impacts range from −6.4% to +3.2%. The assessment of the impacts of types of LCCs showed a variation in global connectivity ranging from −45.1% for open-area reptiles to +170.2% for natural open-area birds with low-dispersion capacities.
This generic approach can be reproduced in a large variety of spatial contexts by adapting the selection of the initial species. The proposed method could inform and guide conservation actions and landscape management strategies so as to enhance or maintain connectivity for species at a landscape scale.
KeywordsConnectivity Dispersion Multi-species Landscape graphs Land-cover changes Impact assessment
- Baillie J, Hilton-Taylor C, Stuart SN (2004) 2004 IUCN red list of threatened species: a global species assessmentGoogle Scholar
- Forman RTT (1995) Land Mosaics. The ecology of landscapes and regions. Cambridge University Press, CambridgeGoogle Scholar
- Giplin M, Hanski I (1991) Metapopulation dynamics: empirical and theoretical investigations. Academic Press, LondonGoogle Scholar
- Millenium Ecosystem Assessment (2003) Ecosystems and human well-being: general synthesis. Island Press, WashingtonGoogle Scholar
- MNHN (2011) Trame verte et bleue. Critères nationaux de cohérence. Contribution à la définition du critère sur les espècesGoogle Scholar
- Solé RV, Bascompte J (2006) Self-organization in complex ecosystems. Princeton University Press, PrincetonGoogle Scholar
- Sordello R, Conruyt-Rogeon G, Merlet F, Houard X, Touroult J (2013) Synthèses bibliographiques sur les traits de vie de 39 espèces proposées pour la cohérence nationale de la Trame verte et bleue relatifs à leurs déplacements et besoins de continuité écologique. ParisGoogle Scholar
- Taylor PD, Fahrig L, With KA (2006) Landscape connectivity: a return to the basics. In: Crooks KR, Sanjayan M (eds) Connectivity conservation. Cambridge University Press, Cambridge, pp 29–43Google Scholar
- UN General Assembly (2012) The Future we want (Resolution adopted by the General Assembly on 27 July 2012). United Nations 53Google Scholar