La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Divergence from the growth-survival trade-off and extreme high growth rates drive patterns of exotic tree invasions in closed-canopy forests
Auteurs :	Patrick H. Martin, Auteur ; Charles D. Canham, Auteur ; Richard K. Kobe, Auteur
Type de document :	Article
Dans :	Journal of Ecology (98(4) JUL 2010)
Article en page(s) :	778-789
Langues:	Anglais
Résumé :	P>1. The study of invasiveness typically emphasizes early successional life-history traits in exotic plants, which enable the capture of high resources in disturbed environments and rapid growth. A key issue in invasion dynamics is whether such behaviours come at the expense of traits such as low-light survivorship, which allow species to become more dominant later in succession. 2. We used maximum-likelihood analysis to compare the growth and survivorship of two exotic trees, Ailanthus altissima and Acer platanoides, with nine dominant native tree species in closed-canopy forests in Connecticut, USA. Growth was modelled as a function of light and survivorship as a function of recent growth; combining models yielded estimates of light-dependent mortality. 3. The exotic species had strikingly high growth rates, exceeding all native species at light levels >= 10% full sun, and growing 2.6 times faster than the fastest-growing native species at 80% full sun. At low-light levels (

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