%0 Conference Proceedings
%9 ACTI : Communications avec actes dans un congrès international
%A Mc Coy, S.
%A Jaffré, Tanguy
%A Ash, J.
%A Rigault, Frédéric
%T Successional patterns in Gymnostoma maquis on ultramafics in southern New Caledonia : the role of fire
%S Deuxième conférence internationale sur l'écologie des milieux serpentiniques, Nouméa, 31 juillet-5 août 1995 : résumés = Second international conference on serpentine ecology, Noumea, july 31-august 5, 1995 : abstracts
%C Nouméa
%D 1995
%L fdi:010005647
%G ENG
%I ORSTOM
%K FORMATION VEGETALE ; MAQUIS ; ROCHE ULTRABASIQUE ; ADAPTATION ; FEU DE BROUSSE ; PHYTOSOCIOLOGIE ; PHYTOECOLOGIE ; ESPECE ENDEMIQUE ; RESTAURATION
%K NOUVELLE CALEDONIE SUD
%P 28
%U https://www.documentation.ird.fr/hor/fdi:010005647
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers10-09/010005647.pdf
%W Horizon (IRD)
%X In many regions of New Caledonia, the ultramafic maquis appears to possess fire adapted traits in addition to being adapted to substrate conditions (Morat et al, 1986 b). Selection of species in these communities may favour fire adapted taxa over ultramafic species. A phytosociological survey was conducted in #Gymnostoma deplancheanum$ communities in southern New Caledonia to identify floristic changes which may suggest a fire related succession pattern. Fire adapted responses of the more common species were also recorded for these communities to both quantify the succession pattern and possibly identify the biogeographic origins of fire tolerance in New Caledonia. MDS ordination of the floristic survey combined with a succession index best explains the variance in the data suggesting the pattern is successional. There appears to be 4 different floristic groups which occur at different times since fire. The first early colonist phase is dominated by vegetative regenerating genera shared largely with the Australian region. Later succession steps are dominated by obligate seeders which facilitate subsequent colonisation of sensitive maquis and forest taxa. It appears that fire adaptation in New Caledonian maquis originated from ancestral Gondwanan tax prior its separation. These sclerophyllous taxa may have increased their radiation on ultramafics during fire promoting dry periods. A second evolution possibly took place in New Caledonian forest taxa in response to dry conditions and led to the creation of fire adapted endemic genera. (Résumé d'auteur)
%B Ecologie des Milieux Serpentiniques : Conférence Internationale = Serpentine Ecology : International Conference
%8 1995/07/31; 1995/08/05
%$ 082VEGET02