Title :

Chemosynthetic ectosymbionts associated with a shallow-water marine nematode

Author(s) :

Bellec, Laure [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Laboratoire de microbiologie des environnements extrêmophiles [LM2E]
Bonavita, Marie-Anne Cambon [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Laboratoire de microbiologie des environnements extrêmophiles [LM2E]
Hourdez, Stéphane [Auteur]
Adaptation et Biologie des Invertébrés en Conditions Extrêmes [ABICE]
Jebbar, Mohamed [Auteur]
Laboratoire de microbiologie des environnements extrêmophiles [LM2E]
Tasiemski, Aurélie [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Durand, Lucile [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Laboratoire de microbiologie des environnements extrêmophiles [LM2E]
Gayet, Nicolas [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Zeppilli, Daniela [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]

Journal title :

SCIENTIFIC REPORTS

Publisher :

Nature Publishing Group

Publication date :

2019-12

ISSN :

2045-2322

HAL domain(s) :

Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE]

English abstract : [en]

Prokaryotes and free-living nematodes are both very abundant and co-occur in marine environments, but little is known about their possible association. Our objective was to characterize the microbiome of a neglected but ...
Show more >Prokaryotes and free-living nematodes are both very abundant and co-occur in marine environments, but little is known about their possible association. Our objective was to characterize the microbiome of a neglected but ecologically important group of free-living benthic nematodes of the Oncholaimidae family. We used a multi-approach study based on microscopic observations (Scanning Electron Microscopy and Fluorescence In Situ Hybridization) coupled with an assessment of molecular diversity using metabarcoding based on the 16S rRNA gene. All investigated free-living marine nematode specimens harboured distinct microbial communities (from the surrounding water and sediment and through the seasons) with ectosymbiosis seemed more abundant during summer. Microscopic observations distinguished two main morphotypes of bacteria (rod-shaped and filamentous) on the cuticle of these nematodes, which seemed to be affiliated to Campylobacterota and Gammaproteobacteria, respectively. Both ectosymbionts belonged to clades of bacteria usually associated with invertebrates from deep-sea hydrothermal vents. The presence of the AprA gene involved in sulfur metabolism suggested a potential for chemosynthesis in the nematode microbial community. The discovery of potential symbiotic associations of a shallow-water organism with taxa usually associated with deep-sea hydrothermal vents, is new for Nematoda, opening new avenues for the study of ecology and bacterial relationships with meiofauna.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL