La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Evaluation of predator numerical responses
Auteurs :	Jim Hone, Auteur ; Charles Krebs, Auteur ; Mark O'Donoghue, Auteur ; Stan Boutin, Auteur
Type de document :	Article
Dans :	Wildlife Research (34(5) 2007)
Article en page(s) :	335-341
Langues:	Anglais
Résumé :	We evaluated hypotheses of the dynamics of predators ( lynx) relative to prey ( snowshoe hares) and predator abundance in the Yukon, Canada. The hypotheses were that predator ( lynx) dynamics are influenced by prey density, or by both prey and predator densities. Annual lynx population growth rate ( r), estimated from lynx counts, was positively related to previous hare density and negatively related to previous lynx density, as described by the best-fitting additive model ( R-2 = 0.85). Annual lynx growth rate ( r) estimated from lynx tracks was positively related to the ratio of hares per lynx in the best-fitting model ( R-2 = 0.55). There was most support for the prey- and predator-dependent hypothesis of predator dynamics. Projected lynx tracks showed similar trends to observed abundance but lagged one year, emphasising the need for evaluation of projected predator trends.

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