La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Physiological responses and statistical models of the environmental niche: a comparative study of two co-occurring Eucalyptus species
Auteurs :	Michael P. Austin, Auteur ; Thomas M. Smith, Auteur ; Kimberley P. Van Niel, Auteur ; A. Bruce Wellington, Auteur
Type de document :	Article
Dans :	Journal of Ecology (97(3) MAY 2009)
Article en page(s) :	496-507
Langues:	Anglais
Résumé :	Our objectives were as follows: (i) to quantify the realized environmental niche of two co-occurring species and their differences and (ii) to examine whether differences in the species niches relate to differences in water and light use efficiency and growth responses to light and water. Statistical models of the environmental niches of two Eucalyptus species were derived from presence/absence records and from environmental variables (mean annual temperature, mean summer rainfall, mean summer daily radiation) and three factors (topographic position, lithology and a nutrient index) for 10 577 plots from south-eastern New South Wales, Australia. Generalized additive models (GAM) were fitted in a backwards stepwise procedure using Aikake's Information Criterion (AIC) for model selection. Seedlings were used in two experiments: (i) a water supply gradient with

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