La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Biotic resistance: exclusion of native rodent consumers releases populations of a weak invader
Auteurs :	Dean E. Pearson, Auteur ; Teal Potter, Auteur ; John L. Maron, Auteur
Type de document :	Article
Dans :	Journal of Ecology (100(6) NOV 2012)
Article en page(s) :	1383-1390
Langues:	Anglais
Résumé :	Biotic resistance is a commonly invoked hypothesis to explain why most exotic plant species naturalize at low abundance. Although numerous studies have documented negative impacts of native consumers on exotic plant performance, longer-term multi-generation studies are needed to understand how native consumer damage to exotics translates to their population-level suppression over large landscapes. We used rodent exclosures and embedded seed-addition experiments to evaluate the effects of rodent herbivory and granivory on populations of Tragopogon dubius, a Eurasian aster that typically occurs at low abundance across North America. Vegetation surveys encompassing 20 000 km2 of west-central Montana grasslands established that T. dubius is regionally well distributed, occurring in 81% of 16 grasslands sampled. However, it consistently occurred at low local abundance, averaging

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