Microbial ecology of the newly discovered serpentinite-hosted Old City hydrothermal field (southwest Indian ridge) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The International Society of Microbiologial Ecology Journal Année : 2020

Microbial ecology of the newly discovered serpentinite-hosted Old City hydrothermal field (southwest Indian ridge)

Résumé

Abstract Lost City (mid-Atlantic ridge) is a unique oceanic hydrothermal field where carbonate-brucite chimneys are colonized by a single phylotype of archaeal Methanosarcinales, as well as sulfur- and methane-metabolizing bacteria. So far, only one submarine analog of Lost City has been characterized, the Prony Bay hydrothermal field (New Caledonia), which nonetheless shows more microbiological similarities with ecosystems associated with continental ophiolites. This study presents the microbial ecology of the ‘Lost City’-type Old City hydrothermal field, recently discovered along the southwest Indian ridge. Five carbonate-brucite chimneys were sampled and subjected to mineralogical and geochemical analyses, microimaging, as well as 16S rRNA-encoding gene and metagenomic sequencing. Dominant taxa and metabolisms vary between chimneys, in conjunction with the predicted redox state, while potential formate- and CO-metabolizing microorganisms as well as sulfur-metabolizing bacteria are always abundant. We hypothesize that the variable environmental conditions resulting from the slow and diffuse hydrothermal fluid discharge that currently characterizes Old City could lead to different microbial populations between chimneys that utilize CO and formate differently as carbon or electron sources. Old City discovery and this first description of its microbial ecology opens up attractive perspectives for understanding environmental factors shaping communities and metabolisms in oceanic serpentinite-hosted ecosystems.
Fichier principal
Vignette du fichier
s41396-020-00816-7.pdf (2.32 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03366331 , version 1 (10-11-2021)

Licence

Paternité

Identifiants

Citer

Aurélien Lecoeuvre, Bénédicte Ménez, Mathilde Cannat, Valérie Chavagnac, Emmanuelle Gérard. Microbial ecology of the newly discovered serpentinite-hosted Old City hydrothermal field (southwest Indian ridge). The International Society of Microbiologial Ecology Journal, 2020, 15 (3), pp.818-832. ⟨10.1038/s41396-020-00816-7⟩. ⟨hal-03366331⟩
37 Consultations
36 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More