A Nematode of the Mid-Atlantic Ridge Hydrothermal Vents Harbors a Possible Symbiotic Relationship

Type Article
Date 2018-09
Language English
Author(s) Bellec Laure1, 2, 3, 4, Cambon-Bonavita Marie-AnneORCID2, 3, 4, Cueff-Gauchard ValerieORCID2, 3, 4, Durand Lucile2, 3, 4, Gayet Nicolas1, Zeppilli DanielaORCID1
Affiliation(s) 1 : IFREMER, Ctr Brest, REM,EEP,LEP, ZI Pointe Diable, CS10070, Plouzane, France.
2 : IFREMER, Ctr Brest, UMR 6197, REM,EEP,LM2E,ZI Pointe Diable, CS10070, Plouzane, France.
3 : IUEM, CNRS, UMR LM2E 6197, Technopole Brest Iroise, Plouzane, France.
4 : UBO, IUEM, UMR LM2E 6197, Technopole Brest Iroise, Plouzane, France.
Source Frontiers In Microbiology (1664-302X) (Frontiers Media Sa), 2018-09 , Vol. 9 , N. 2246 , P. 12p.
DOI 10.3389/fmicb.2018.02246
WOS© Times Cited 11
Keyword(s) sulfur-oxidizing bacteria, Lucky Strike vent field, meiofauna, nematode, endosymbiont

Deep-sea hydrothermal vent meiofauna have been the focus of recent research and the discovery of an abundant well-adapted free-living marine nematode on the Mid-Atlantic Ridge offers new perspectives on adaptations to the vent environment. Indeed, knowledge concerning biological interactions of microbes and meiofauna in marine extreme environments is scarce, especially for nematodes. In this study, we used microscopic observations [fluorescence in situ hybridization (FISH) and scanning electron microscopy (SEM)] and metabarcoding of 16S rRNA to characterize the bacterial community of the nematode species Oncholaimus dyvae, an overlooked but ecologically important vent organism. Detection of bacteria in the buccal cavity and on the cuticle (SEM) and epibionts in its intestine (FISH) suggests that O. dyvae harbors its own bacterial community. Molecular results and phylogenetic analysis show that bacteria associated with this species are related to symbiotic lineages typical of hydrothermal vent fauna, such as sulfur-oxidizing bacteria related to Epsilonproteobacteria and Gammaproteobacteria. This multi-approach study suggests a potential symbiotic role of bacteria with its nematode host and opens new research perspectives on vent meiofauna.

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