Bordez L. auteur aut IRD Jourand Philippe auteur aut IRD Ducousso M. auteur aut IRD Carriconde F. auteur aut IRD Cavaloc Y. auteur aut IRD Santini S. auteur aut IRD Claverie J.M. auteur aut IRD Wantiez L. auteur aut IRD Leveau A. auteur aut IRD Amir H. auteur aut IRD text journalArticle eng text/pdf born digital access Microbial species richness and assemblages across ultramafic ecosystems were investigated to assess the relationship between their distributional patterns and environmental traits. The structure of microorganism communities in the Koniambo massif, New Caledonia, was investigated using a metagenetic approach correlated with edaphic and floristic factors. Vegetation cover and soil properties significantly shaped the large phylogenetic distribution of operational taxonomic unit within microbial populations, with a mean per habitat of 3.477 (±317) for bacteria and 712 (±43) for fungi. Using variance partitioning, we showed that the effect of aboveground vegetation was the most significant descriptor for both bacterial and fungal communities. The floristic significant predictors explained 43% of the variation for both the bacterial and fungal community structures, while the edaphic significant predictors explained only 32% and 31% of these variations, respectively. These results confirm the previous hypothesis that the distribution of microorganisms was more structured by the vegetation cover rather than the edaphic characteristics and that microbial diversity is not limited in ultramafic ecosystems. specialized NOUVELLE CALEDONIE 074 084 082 068 25 10 2258-2272 2016 0962-1083 https://www.documentation.ird.fr/hor/fdi:010067185 10.1111/mec.13621 0962-1083 [F B010067185] https://www.documentation.ird.fr/hor/fdi:010067185 https://www.documentation.ird.fr/intranet/publi/depot/2016-05-27/010067185.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-05-27 2016-07-12 fdi:010067185 fre