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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Abrupt spatial and numerical responses of overabundant foxes to a reduction in anthropogenic resources
Auteurs :	Gilad Bino, Auteur ; Amit Dolev, Auteur ; Dotan Yosha, Auteur ; Amichay Guter, Auteur ; Roni King, Auteur ; David Saltz, Auteur ; Salit Kark, Auteur
Type de document :	Article
Dans :	Journal of Applied Ecology (47(6) DEC 2010)
Article en page(s) :	1262-1271
Langues:	Anglais
Résumé :	1. Carnivore overabundance that results from exploitation of human derived resources can have numerous detrimental effects on local human populations and ecological communities. Experimental studies on the responses of overabundant carnivores to reductions of such resources are necessary to understand the effectiveness and impacts of resource reduction. 2. We conducted controlled experiments in two villages in which we drastically reduced the availability of anthropogenic food sources in half of each village. Spatial and numerical responses of radio-collared red foxes Vulpes vulpes were recorded and contrasted with those of radio-collared foxes in three similar untreated villages and pristine areas in the region. In total, we looked at survival rates of 134 foxes. 3. Prior to the resource manipulation, home range sizes (0 47 and 0 56 km(2)) and population densities (30 and 36 foxes km(-2)) in the two villages were comparable to documented low and high-end values, respectively. 4. Fast and distinct spatial responses were observed in response to the resource manipulation, and were manifested in either increased home range size or home range shifts. In one village, foxes exposed to reduced resource availability more than doubled their home range size. 5. Survival rates of individuals in the treated areas were drastically reduced. Actual fox mortality in the two treated areas reached 100% and 64% within 12 months of the onset of resource manipulation. Estimated monthly survival in the two treated areas declined from 0.96-0.98 and 0.98-0.99 (similar to 0.69 and 0.78 derived annual survival) before treatment to 0.80-0.83 and 0.92-0.94 (similar to

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