Ecology and trophic role of Oncholaimus dyvae sp. nov. (Nematoda: Oncholaimidae) from the lucky strike hydrothermal vent field (Mid-Atlantic Ridge)

Zeppilli, Daniela; Bellec, Laure; Cambon-Bonavita, Marie-Anne; Decraemer, Wilfrida; Fontaneto, Diego; Fuchs, Sandra; Gayet, Nicolas; Mandon, Perrine; Michel, Loïc; Portail, Marie; Smol, Nic; Sørensen, Martin V.; Vanreusel, Anne; Sarrazin, Jozée

doi:10.1186/s40850-019-0044-y

Article (Scientific journals)

Ecology and trophic role of Oncholaimus dyvae sp. nov. (Nematoda: Oncholaimidae) from the lucky strike hydrothermal vent field (Mid-Atlantic Ridge)

Zeppilli, Daniela; Bellec, Laure; Cambon-Bonavita, Marie-Anne et al.

2019 • In BMC Zoology, 4 (6)

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/242208

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10.1186/s40850-019-0044-y

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Keywords :

Oncholaimus dyvae sp. nov; hydrothermal vents; deep sea; carbon and nitrogen isotopic ratios

Abstract :

[en] Background Nematodes are an important component of deep-sea hydrothermal vent communities, but only few nematode species are able to cope to the harsh conditions of the most active vent sites. The genus Oncholaimus is known to tolerate extreme geothermal conditions and high sulphide concentrations in shallow water hydrothermal vents, but it was only occasionally reported in deep-sea vents. In this study, we performed morphological, genetic and ecological investigations (including feeding strategies) on an abundant species of Oncholaimus recently discovered at Lucky strike vent field on the Mid-Atlantic Ridge at 1700 m water depth. Results We described this species as Oncholaimus dyvae sp. nov.. This new species differs from all other members of the genus by the combination of the following characters: body length (up to 9 mm), the presence of a long spicule (79 μm) with a distally pointed end, a complex pericloacal setal ornamentation with one precloacal papilla surrounded by short spines, and a body cuticule with very fine striation shortly posterior to the amphid opening. Overall, O. dyvae sp. nov. abundance increased with increasing temperature and vent emissions. Carbon isotopic ratios suggest that this species could consume both thiotroph and methanotrophic producers. Furthermore sulfur-oxidizing bacteria related to Epsilonproteobacteria and Gammaproteobacteria were detected in the cuticle, in the digestive cavity and in the intestine of O. dyvae sp. nov. suggesting a potential symbiotic association. Conclusions This study improves our understanding of vent biology and ecology, revealing a new nematode species able to adapt and be very abundant in active vent areas due to their association with chemosynthetic micro-organisms. Faced by the rapid increase of anthropogenic pressure to access mineral resources in the deep sea, hydrothermal vents are particularly susceptible to be impacted by exploitation of seafloor massive sulfide deposits. It is necessary to document and understand vent species able to flourish in these peculiar ecosystems.

Disciplines :

Aquatic sciences & oceanology
Environmental sciences & ecology
Zoology

Author, co-author :

Zeppilli, Daniela

Bellec, Laure

Cambon-Bonavita, Marie-Anne

Decraemer, Wilfrida

Fontaneto, Diego

Fuchs, Sandra

Gayet, Nicolas

Mandon, Perrine

Michel, Loïc ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution

Portail, Marie

More authors (4 more)

Language :

English

Title :

Ecology and trophic role of Oncholaimus dyvae sp. nov. (Nematoda: Oncholaimidae) from the lucky strike hydrothermal vent field (Mid-Atlantic Ridge)

Publication date :

26 July 2019

Journal title :

BMC Zoology

eISSN :

2056-3132

Publisher :

BMC, London, United Kingdom

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://doi.org/10.1186/s40850-019-0044-y

Available on ORBi :

since 12 December 2019

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