title: Distribution patterns of microbial communities in ultramafic landscape: a metagenetic approach highlights the strong relationships between diversity and environmental traits.
abstract: 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.
authors.affiliation: Laboratoire Insulaire du Vivant et de l'Environnement (LIVE), Université de la Nouvelle-Calédonie (UNC), BP R4, Avenue James Cook, 98851, Nouméa Cedex, Nouvelle-Calédonie.|Koniambo Nickel SAS (KNS), BP 696, 98860, Koné, Nouvelle-Calédonie.|IRD, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM, UMR040), TA A-82/J, 34398, Montpellier cedex 5, France.|Institut Agronomique néo-Calédonien (IAC), BPA5, 98848, Nouméa, Nouvelle-Calédonie.
authors.forename: L
authors.initials: L
authors.lastname: Bordez
authors.affiliation: IRD, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM, UMR040), TA A-82/J, 34398, Montpellier cedex 5, France.
authors.forename: P
authors.initials: P
authors.lastname: Jourand
authors.affiliation: CIRAD, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM, UMR082), TA A-82/J, 34398, Montpellier cedex 5, France.
authors.forename: M
authors.initials: M
authors.lastname: Ducousso
authors.affiliation: Institut Agronomique néo-Calédonien (IAC), BPA5, 98848, Nouméa, Nouvelle-Calédonie.
authors.forename: F
authors.initials: F
authors.lastname: Carriconde
authors.affiliation: Laboratoire Insulaire du Vivant et de l'Environnement (LIVE), Université de la Nouvelle-Calédonie (UNC), BP R4, Avenue James Cook, 98851, Nouméa Cedex, Nouvelle-Calédonie.
authors.forename: Y
authors.initials: Y
authors.lastname: Cavaloc
authors.affiliation: Laboratoire Information Génomique et Structurale (IGS), UMR7256 CNRS, Aix-Marseille Université, 13288, Marseille cedex 09, France.
authors.forename: S
authors.initials: S
authors.lastname: Santini
authors.affiliation: Laboratoire Information Génomique et Structurale (IGS), UMR7256 CNRS, Aix-Marseille Université, 13288, Marseille cedex 09, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Claverie
authors.affiliation: Laboratoire Insulaire du Vivant et de l'Environnement (LIVE), Université de la Nouvelle-Calédonie (UNC), BP R4, Avenue James Cook, 98851, Nouméa Cedex, Nouvelle-Calédonie.
authors.forename: L
authors.initials: L
authors.lastname: Wantiez
authors.affiliation: Koniambo Nickel SAS (KNS), BP 696, 98860, Koné, Nouvelle-Calédonie.
authors.forename: A
authors.initials: A
authors.lastname: Leveau
authors.affiliation: Laboratoire Insulaire du Vivant et de l'Environnement (LIVE), Université de la Nouvelle-Calédonie (UNC), BP R4, Avenue James Cook, 98851, Nouméa Cedex, Nouvelle-Calédonie.
authors.forename: H
authors.initials: H
authors.lastname: Amir
mesh_terms: D001419:Bacteria / Q000145:classification*; D044822:Biodiversity; D004269:DNA, Bacterial / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics; D017753:Ecosystem; D065928:Forests; D005658:Fungi / Q000145:classification*; D064307:Microbiota; D009510:New Caledonia; D010802:Phylogeny; D010944:Plants; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D004271:DNA, Fungal
keywords: metagenetic; microbial communities; topsoil; ultramafic ecosystems