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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Response of recruitment to light availability across a tropical lowland rain forest community
Auteurs :	Nadja Rueger, Auteur ; Andreas Huth, Auteur ; Stephen P. Hubbell, Auteur ; Richard Condit, Auteur
Type de document :	Article
Dans :	Journal of Ecology (97(6) NOV 2009)
Article en page(s) :	1360-1368
Langues:	Anglais
Résumé :	P> Many hypotheses about species coexistence involve differential resource use and trade-offs in species' life-history traits. Quantifying resource use across most species in diverse communities, although, has seldom been attempted. We use a hierarchical Bayesian approach to quantify the light dependence of recruitment in 263 woody species in a 50-ha long-term forest census plot in Panama. Data on sapling recruitment were obtained using the 1985-1990 and 1990-1995 census intervals. Available light was estimated for each recruit from yearly censuses of canopy density. We use a power function (linear log-log relationship) to model the light effect on recruitment. Different responses of recruitment to light are expressed by the light effect parameter b. The distribution of b had a central mode at 0.8, suggesting that recruitment of many species responds nearly linearly to increasing light. Nearly every species showed increases in recruitment with increasing light. Just nine species (3%) had recruitment declining with light, while 198 species (75%) showed increasing recruitment in both census intervals. Most of the increases in recruitment were decelerating, i.e. the increase was less at higher light (b

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