La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Trophic cascades in Yellowstone: The first 15 years after wolf reintroduction
Auteurs :	William J. Ripple, Auteur ; Robert L. Beschta, Auteur
Type de document :	Article
Dans :	Biological Conservation (145(1) JAN 2012)
Article en page(s) :	205-213
Langues:	Anglais
Résumé :	The 1995/1996 reintroduction of gray wolves (Canis lupus) into Yellowstone National Park after a 70 year absence has allowed for studies of tri-trophic cascades involving wolves, elk (Cervus elaphus), and plant species such as aspen (Populus tremuloides), cottonwoods (Populus spp.), and willows (Salix spp.). To investigate the status of this cascade, in September of 2010 we repeated an earlier survey of aspen and measured browsing and heights of young aspen in 97 stands along four streams in the Lamar River catchment of the park's northern winter range. We found that browsing on the five tallest young aspen in each stand decreased from 100% of all measured leaders in 1998 to means of

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