%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES
%A Read, J.
%A Jaffré, Tanguy
%T Population dynamics of canopy trees in New Caledonian rain forests : are monodominant Nothofagus (Nothofagaceae) forests successional to mixed rain forests ?
%D 2013
%L fdi:010060215
%G ENG
%J Journal of Tropical Ecology
%@ 0266-4674
%K FORET SECONDAIRE ; ARBRE FORESTIER ; CANOPEE FORESTIERE ; DOMINANCE ; DYNAMIQUE DE POPULATION ; STRUCTURE DE POPULATION ; REGENERATION ; DENSITE DE POPULATION ; EVOLUTION ; CYCLONE TROPICAL ; ALTITUDE
%K TAILLE ; FEU ; ANALYSE DE COHORTES
%K NOUVELLE CALEDONIE ; ZONE TROPICALE HUMIDE
%N 5
%P 485-499
%R 10.1017/S0266467413000576
%U https://www.documentation.ird.fr/hor/fdi:010060215
%> https://www.documentation.ird.fr/intranet/publi/depot/2013-12-16/010060215.pdf
%V 29
%W Horizon (IRD)
%X In New Caledonia, rain forests with an upper canopy dominated by single species of Nothofagus occur next to mixed-canopy forests, without discernible environmental cause. A potential explanation is that they are different successional stages. To test this hypothesis and predict long-term change in canopy dominance, population size structures of 61 canopy species were analysed in six Nothofagus-dominated forests and three adjacent mixed rain forests. Weibull analysis suggests that these Nothofagus forests are secondary forests, with recruitment insufficient to maintain monodominance, except at a high-altitude site. At low- to mid-altitudes the Nothofagus canopy is predicted to develop into amixed canopy, unlessmoderate to severe disturbance occurs within its reproductive lifespan. However, adjacent mixed rain forests are also secondary, with 85% of analysed species showing no evidence of continuous regeneration. Fifteen species from both forest types showed reverse-J curves suggesting continuous regeneration, but only Calophyllum caledonicum did so consistently. Since few canopy species showed evidence of high shade tolerance and persistence, a small number of shade-tolerant species is predicted to dominate both forests in the long term, in the hypothetical absence of disturbance. Hence, temporal factors associated with disturbances play a key role in determining dominance in these forests.
%$ 082VEGET02 ; 076BOTA02