2014 SCOR InterRidge Working Group Report

N. Le Bris 31.05.2014

The  Working Group has organized its third meeting in Vienna, Austria, in the context of the European Geosciences Union General Assembly 2014. The WG meeting was held  on April 28th, with the primary aim of discussing the review papers that are proposed as deliverables in the WG terms of references.

The primary aim of the meeting was to discuss the progress of review papers to be finalized by the end of this year. S. Sanders, L. Legendre and C.R. German have lead a first review paper focussing on hydrothermal plume interaction with the oceanic water masses. A review outline set up and was discussed for the second paper. In addition to synthesizing the current knowledge, the aim of this review is to identify gaps, which will justify the development of a large scale in situ interdisciplinary experiments and the necessary adaptation of instruments and methods to the particularly extreme conditions of these deep-sea environments in the upcoming years.

The tighly constrained agendas of most WG members who are involved intensifying at-sea programmes (IODP, GEOTRACE, ..) impede the organization of a workshop as we first planned. The EGU conference offered an alternative to present the different research activities lying behind the theme of ‘Hydrothermal energy transfer and its relation to ocean carbon cycling’. In addition to the WG meeting, on May 2nd, an oral communication and poster session were hold in the Biogeoscience programme of EGU (session abstract and presentation list below). The session also included flash poster presentations on April 30.

All these events constituted an opportunity to gather 8 of the WG members together with 6 young scientists (PhD student or post-docs) covering the various disciplinary aspect and topics of the WG theme. It was given the young scientist the opportunity to be  included in the discussion and in the preparation of the review. Their works, in collaboration with different group members, are indeed of high relevant to the review process.

Next stages involve the resubmission of the paper on the biogeochemical impacts of hydrothermal plumes, and the drafting of the six sessions of the complete review, which is considered due by September.

Participants to the meeting

Working group members : Nadine Le Bris, Sylvia Sander, Louis Legendre, Katrina Edwards, Sylvia Sander, Xiqiu Han, Loka Bharathi P.A., Chris R. German

Young scientists : Anindita Das (coll. L. Bharathi) , Gustavo Ramírez (PhD student, K. E. Edwards), Charles Vidoudez (Post-doc P. Girguis and coll. W. Bach, N. Dubillier), Mustafa Yücel (coll. G.W. Luther, and coll. N. Le Bris), Sarah Bennett (coll. C.R. German), Solveig I. Bühring (coll. S. Sievert).

EGU session BG7.2 Convener: Nadine Le Bris, Co-Convener: Chris German

Hydrothermal energy transfer and its relation to ocean carbon cycling: from mechanisms and rates to services for marine ecosystems

Hydrothermal systems in the deep ocean have been studied from the past 37 years, but their impact on the ocean biogeochemistry and related ecological processes is far from being understood. Vent ecosystems were long described as largely independent from the photosynthesis-driven biosphere, a paradigm which no longer stands. Today we have a slightly clearer picture of the role energy transfer from hydrothermal circulation could play on ecosystems across a range of depths and on subseafloor carbon sequestration. At a time the exploration and exploitation of deep-sea mineral resources is rapidly developing, with potential impacts to habitats and biodiversity, there is a urgent need to consider the potential ‘services’ that is provided by these systems to the ocean.

The aim of this session is to synthesize the most advanced knowledge on:

1) carbon-fixation pathways in the different compartments influenced by hydrothermal activity, the metabolic diversity sustaining them and their dependence on oceanic processes,

2) biotic and abiotic drivers of productivity of related seafloor and subseafloor ecosystems, their natural dynamics and sensitivity to disturbance,

3) hydrothermally-derived fluxes of micronutrients and exported DOC and their potential influence on ocean biogeochemistry at larger scale.

4) integration of these processes into conceptual models of energy transfer and carbon cycling.

Our objective is also to enlarge the discussion outside the field of vent research with a broader scientific community and determine the opportunities to bridge scientific efforts focussing on these environments with larger marine science programmes in view of a future assessment the potential contribution that they may make to the ocean ecosystems and carbon cycle at different scales. This session is organized as part of the InterRidge and SCOR WG135 working group activities.

Oral presentations


Coupled cycling of Fe and organic carbon in submarine hydrothermal systems: Impacts on Ocean Biogeochemistry?
Christopher German, Sylvia Sander, Louis Legendre, Nathalie Niquil, and Working Group 135


Ridge Flank Hydrothermal Systems and their relationship to the oceanic carbon cycle
Katrina Edwards


An Interdisciplinary And Multinational Program To Study Microbial Energy Transfer And Chemosynthetic Carbon Fixation At Deep-Sea Vents
Stefan Sievert, Dionysis Foustoukos, Jeffrey S. Seewald, Ramunas Stepanauskas, Craig D. Taylor, Costantino Vetriani, Nadine Le Bris, Niculina Musat, Thomas Schweder, and Fengping Wang


Constraining geochemistry and biological primary productivity in hydrothermal systems via in situ mass spectrometric geochemical mapping
Charles Vidoudez, Yann Marcon, Wolfgang Bach, Nadine Lebris, Nicole Dubilier, and Peter Girguis


Stabilization of dissolved trace metals at hydrothermal vent sites: Impact on their marine biogeochemical cycles. Sylvia G. Sander, Zach D. Powell, Andrea Koschinsky, Stefan Kuzmanovski, and Charlotte Kleint


Environmental controls on chemoautotrophic primary producers at deep-sea vents
Nadine Le Bris, Lauren Mullineaux, and Stefan Sievert


Previously unsuspected dietary habits of hydrothermal vent fauna: the bactivorous shrimp Rimicaris hybisae can be carnivorous or even cannibalistic
Emma Versteegh, Cindy Van Dover, and Max Coleman


Carbon fluxes from hydrothermal vents off Milos, Aegean Volcanic Arc, and the influence of venting on the surrounding ecosystem.
Paul Dando, Stefano Aliani, Nike Bianchi, Hilary Kennedy, Peter Linke, and Carla Morri


Coupled cycling of Fe and organic carbon in submarine hydrothermal systems: Modelling approach
Louis Legendre, Christopher R. German, Sylvia G. Sander, and Nathalie Niquil


The hydrothermal CH4 and δ3He anomalies along the Southwest Indian Ridge between 49°E to 56°E
Xiqiu Han, Zhongyan Qiu, Yejian Wang, and Yingyu Lu


Propidium Monoazide-based Method for Identifying Phylogenetic Association of Necromass Near Hydrothermal Systems
Gustavo Ramírez and Katrina Edwards


Geochemistry driven trends in microbial diversity and function across a temperature transect of a shallow water hydrothermal system off Milos (Greece)
Solveig I. Bühring, Jan P. Amend, Gonzalo V. Gómez Sáez, Stefan Häusler, Kai-Uwe Hinrichs, Thomas Pichler, Petra Pop Ristova, Roy E. Price, Ioulia Santi, and Miriam Sollich


Dynamic drivers of a shallow-water hydrothermal vent ecogeochemical system (Milos, Eastern Mediterranean)
Mustafa Yücel, Stefan Sievert, Donato Giovanelli, Dionysis Foustoukos, Emelia DeForce, François Thomas, Constantino Vetriani, and Nadine Le Bris


Hydrothermal energy transfer and contribution to autotrophic CO2 fixation down sediment core in Central Indian Basin
Anindita Das and LokaBharathi P.A.


The influence of vent fluid chemistry on trophic structure at two deep-sea hydrothermal vent fields on the Mid-Cayman Rise
Sarah Bennett, Cindy Van Dover, and Max Coleman