@book{fdi:010058485, title = {{E}ctotrophic mycorrhizal symbioses are dominant in natural ultramafic forest ecosystems of {N}ew {C}aledonia}, author = {{P}rin, {Y}. and {D}ucousso, {M}. and {T}assin, {J}. and {B}{\'e}na, {G}illes and {J}ourand, {P}hilippe and {D}umontet, {V}. and {M}oulin, {L}ionel and {C}ontesto, {C}. and {A}mbrosi, {J}ean-{P}aul and {C}haintreuil, {C}l{\'e}mence and {D}reyfus, {B}ernard and {L}ebrun, {M}ichel}, editor = {}, language = {{ENG}}, abstract = {{I}nsularity, geological history and biogeography have made from {N}ew-{C}aledonia a hot spot of biodiversity where extremely diversified ecosystems occupies ultramafic terrains with drastic edaphic conditions in terms of fertility and metallic toxicity. {I}n the framework of the mine project of the {K}oniambo {M}assif, a large nickel deposit, we tried to explore the diversity of ectomycorrhizal symbioses within these poorly explored natural ultramafic ecosystems. {F}loristic inventories along an altitudinal gradient ranging from 700 to 900 m evidenced 4 different plant communities. {T}he 2 lower plant communities, 3 and 4, were dominated by 2 endemic tree genera, {T}ristaniopsis ({L}eptospermoideae) and {N}othofagus ({N}othofagaceae) respectively, whose ectomycorrhizal ({ECM}) status was shown and explored through molecular methods on sporocarps, mycorrhizae and soil mycelium. {W}e evidenced a diversified fungal community in the basal plant community dominated by two tree species of the genus {N}othofagus. {T}he molecular characterization of these {ECM} fungi was established on the total ribosomal inter transcribed spacer ({ITS}) by {PCR}-sequencing and {BLAST}n analysis, revealing the relative abundance of the {C}ortinariaceae among our samples. {S}amples belonging to this fungal family were phylogenetically analyzed on the same {ITS}, in reference to sequences of samples with geographically different origins, including countries derived from the {G}ondwanaland fragmentation. {I}f no clear phylogenetical relationships were evidenced, our study confirmed the same relative dominance of {ECM} {N}othofagaceae, as well as the relative abundance of associated {C}ortinariaceae, in {N}ew {C}aledonia as in several of the {G}ondwanaland-originating countries.}, keywords = {{ECTOMYCORHIZE} ; {DIVERSITE} {SPECIFIQUE} ; {SYMBIOSE} ; {ROCHE} {ULTRABASIQUE} ; {FACTEUR} {EDAPHIQUE} ; {PLANTE} {HOTE} ; {INVENTAIRE} {DE} {VEGETATION} ; {ARBRE} {FORESTIER} ; {ESPECE} {ENDEMIQUE} ; {PHYLOGENIE} ; {BIOGEOGRAPHIE} ; {EVOLUTION} ; {NOUVELLE} {CALEDONIE} ; {ZONE} {MEDITERRANEENNE} ; {KONIAMBO}}, address = {{N}ew {Y}ork}, publisher = {{N}ova {S}cience}, series = {{E}nvironmental {S}cience, {E}ngineering and {T}echnology}, pages = {25-48}, year = {2012}, ISBN = {978-1-62081-278-5}, URL = {https://www.documentation.ird.fr/hor/fdi:010058485}, }