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Habitat fragmentation and amphibian conservation: building a tool for assessing landscape matrix connectivity

by: Pierre Joly, Claire Morand, Aurélie Cohas
Comptes Rendus Biologies, Vol. 326 (August 2003), pp. 132-139, doi:10.1016/s1631-0691(03)00050-7  Key: citeulike:12053643

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Abstract

We have attempted modelling biological connectivity for a toad population in a floodplain in the combined framework of population dynamics and landscape ecology. We took advantage of the GIS package for establishing friction maps for the focal species by attributing to each habitat type a resistance index. This approach made it possible to draw migration zones around each pond the area and the shape of which depended on landscape structure. We included mortality from road traffic by assigning a virtual population to each pond. The resulting map shows the potentiality of such an approach in the assistance of landscape management. To cite this article: P. Joly et al., C. R. Biologies 326 (2003). Nous avons tenté de construire un modèle spatialement explicite de connexité pour les populations de crapauds d'une plaine alluviale. Nous avons utilisé les potentialités d'un logiciel SIG pour établir une carte de friction basée sur la résistance de chaque type d'habitat aux mouvements de l'espèce. Cette démarche a permis de construire des zones de migration autour de chaque étang, dont la superficie et la forme dépendent de la structure du paysage. Nous avons aussi inclus la mortalité due au trafic routier en attribuant à chaque étang une population virtuelle. La carte ainsi produite démontre les vertus de cette approche pour assister les politiques de gestion du paysage. Pour citer cet article : P. Joly et al., C. R. Biologies 326 (2003).


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