Ecological succession leads to chemosynthesis in mats colonizing wood in sea water

Kalenitchenko Dimitri, Dupraz Marlene, Le Bris Nadine, Peletin Carole, Rose Christophe, West Nyree J., Galand Pierre E.. 2016. Ecological succession leads to chemosynthesis in mats colonizing wood in sea water. ISME Journal, 10 : 2246-2258.

https://doi.org/10.1038/ismej.2016.12

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
Kalenitchenko et al. - 2016 - Ecological succession leads to chemosynthesis in m.pdf
Télécharger (1MB) | Demander une copie

Quartile : Outlier, Sujet : ECOLOGY / Quartile : Outlier, Sujet : MICROBIOLOGY

Résumé : Chemosynthetic mats involved in cycling sulfur compounds are often found in hydrothermal vents, cold seeps and whale falls. However, there are only few records of wood fall mats, even though the presence of hydrogen sulfide at the wood surface should create a perfect niche for sulfide-oxidizing bacteria. Here we report the growth of microbial mats on wood incubated under conditions that simulate the Mediterranean deep-sea temperature and darkness. We used amplicon and metagenomic sequencing combined with fluorescence in situ hybridization to test whether a microbial succession occurs during mat formation and whether the wood fall mats present chemosynthetic features. We show that the wood surface was first colonized by sulfide-oxidizing bacteria belonging to the Arcobacter genus after only 30 days of immersion. Subsequently, the number of sulfate reducers increased and the dominant Arcobacter phylotype changed. The ecological succession was reflected by a change in the metabolic potential of the community from chemolithoheterotrophs to potential chemolithoautotrophs. Our work provides clear evidence for the chemosynthetic nature of wood fall ecosystems and demonstrates the utility to develop experimental incubation in the laboratory to study deep-sea chemosynthetic mats.

Mots-clés Agrovoc : synthèse chimique, succession naturelle, écosystème marin, fond marin, sulfure d'hydrogène, aptitude à coloniser, Pinus pinea, eaux profondes

Mots-clés géographiques Agrovoc : mer Méditerranée

Mots-clés complémentaires : Arcobacter

Mots-clés libres : Biofilms

Classification Agris : M40 - Écologie aquatique

Champ stratégique Cirad : Hors axes (2014-2018)

Auteurs et affiliations