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Distribution patterns of microbial communities in ultramafic landscape: A metagenetic approach highlights the strong relationships between diversity and environmental traits

Bordez L., Jourand P., Ducousso M., Carriconde F., Cavaloc Y., Santini S., Claverie J.M., Wantiez L., Leveau A., Amir H.. 2016. Molecular Ecology, 25 (10) : p. 2258-2272.

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 both for 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.

Mots-clés : génomique; Écosystème; sol minéral; métal lourd; type de sol; biologie du sol; biodiversité; champignon du sol; bacteria; taxonomie; phylogénie; facteur édaphique; facteur du milieu; couverture végétale; Écologie microbienne; fertilité du sol; dynamique des populations; flore du sol; nouvelle-calédonie

Thématique : Biologie du sol; Fertilité du sol; Erosion, conservation et récupération des sols; Ecologie végétale

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