Type Oceanographic cruise
Set This cruise is part of the set MOMARSAT : MONITORING THE MID ATLANTIC RIDGE
Ship Pourquoi pas ?
Ship owner Ifremer
Dates 08/07/2017 - 28/07/2017
Chief scientist(s) SARRADIN Pierre-Marie ORCID, CANNAT Mathilde


IFREMER Centre de Bretagne

ZI Pointe du diable

CS 10070


+33 (0)2

DOI 10.17600/17000500
Objective The MoMARSAT cruise ensure annual maintenance of the EMSO-Azores observatory in the Lucky Strike hydrothermal field. This seafloor observatory has been operated since 2010 and aims to acquire >=10 years of time series on hydrothermal, tectonic and volcanic processes and the ecosystems of an active hydrothermal site on the Mid-Atlantic Ridge. It is part of the European EMSO (European Multidisciplinary Seafloor and water column Observatory) network, supported in France by the EMSO-FR MESR infrastructure which is led by Ifremer-CNRS collaboration and which is a component of the European FIXO3 Fixed point Open Ocean Observatory network. The array has an observatory infrastructure stricto sensu: a buoy (BOREL) providing data transfer to a server on shore as well as communications with connected instruments, and two junction boxes (SEAMON) on the seabed which communicate acoustically with the surface buoy. The instruments are connected to these junction boxes. The array also includes autonomous instruments providing internal data storage. In its current configuration (after MOMARSAT 2017 maintenance) the observatory comprises a connected seismometer (OBS), a connected bottom pressure probe, a connected biological observation module (TEMPO - with an HDTV video camera and 4 projectors, temperature, oxygen, dissolved iron and turbidity sensors), 20 autonomous temperature probes for hydrothermal fluids and mixing zones, 3 autonomous current-meters set on the seabed, 1 generic EGIM module, 1 array of 4 hydrophones (Hydroctopus), 1 temperature and chlorinity sensor, 4 microbiological colonization units and an oceanographic mooring. The 2017 cruise also made it possible to change the BOREL buoy in place since the beginning of the experiment (and whose mooring broke in April 2017) and to deploy a brand new autonomous prototype for sequential sampling of hydrothermal fluids (DEAFS). In-situ measurements as well as fluid and biological samples were taken to complement the set of parameters and integrate a spatial component at each maintenance operation. This year two significant experiments were also carried out: one experiment for a chronobiological study in the Bathymodiolus azoricus horse mussel and another to study the restoration of assemblages of this horse mussel after disturbance. Maintenance operations included retrieving the BOREL-SEAMON infrastructure and connected instruments, reconditioning them on board, then redeploying them. Recovery and redeployment of autonomous instruments are done either during the ROV inter-dives for the oceanographic mooring or on dedicated ROV dives for other sensors and sampling. Experience gained from previous maintenance enabled an optimised cruise strategy to be proposed for 15 to 17 days in the zone, taking account of possible technical and meteorological hazards. There are 31 people on the maintenance team, including 10 staff for the BOREL and SEAMON infrastructure and sensors and 21 scientific staff to operate the sensors and coordinate sampling. Coordination of maintenance operations and the initial use of data is ensured by Mathilde Cannat. Operations on board were led by two of the four experienced co-head scientists mobilised for the project (Pierre Marie Sarradin, Jérôme Blandin, Mathilde Cannat and Javier Escartin). Satellite-transmitted data are immediately available on an EMSO server ( The team involves Ifremer (REM RTD and EEP), 5 INSU laboratories (IPGP, LOPS, OMP-GET, IUEM, and LIENs-la Rochelle), two Portuguese entities (University of Azores and University of Lisbon), and colleagues from the University of Washington in Seattle and the University of Bergen. The study zone is part of Portugal's EEZ and a "Marine Protected Area" (OSPAR). On this year's cruise, a team of artists and video makers took part in the framework of the Deep thoughts "arts and sciences" project whose objective is to create collaborative work between artists and scientist for a show on deep sea environments in 2019. The ship's log for the cruise was published on this project's blog (

Published data

Matabos Marjolaine, Brulport Jean-Pierre, Rodier Philippe, Sarrazin Jozee, Sarradin Pierre-Marie, Cannat Mathilde (2021). Autonomous ibuttons temperature data from the EMSO-Azores observatory, 2017-2018.

Marticorena Julien, Matabos Marjolaine, Sarrazin Jozee, Ramirez-Llodra Eva (2020). Reproductive biology and population structure of Protolira valvatoides and Pseudorimula midatlantica.

Data managed by SISMER

Sampling operations





Marticorena JulienORCID, Matabos MarjolaineORCID, Ramirez-Llodra E., Cathalot CecileORCID, Laes AgatheORCID, Leroux Romain, Hourdez S., Donval Jean-Pierre, Sarrazin JozeeORCID (2021). Recovery of hydrothermal vent communities in response to an induced disturbance at the Lucky Strike vent field (Mid-Atlantic Ridge). Marine Environmental Research, 168, 105316 (14p.).

Marticorena JulienORCID, Matabos MarjolaineORCID, Sarrazin JozeeORCID, Ramirez-Llodra E. (2020). Contrasting reproductive biology of two hydrothermal gastropods from the Mid-Atlantic Ridge: implications for resilience of vent communities. Marine Biology, 167(8), 109 (19p.). Publisher's official version : , Open Access version :

Mat Audrey, Sarrazin JozeeORCID, Markov Gabriel V., Apremont Vincent, Dubreuil ChristineORCID, Eché Camille, Fabioux Caroline, Klopp Christophe, Sarradin Pierre-MarieORCID, Tanguy Arnaud, Huvet ArnaudORCID, Matabos MarjolaineORCID (2020). Biological rhythms in the deep-sea hydrothermal mussel Bathymodiolus azoricus. Nature Communications, 11(1), 3454 (12p.). Publisher's official version : , Open Access version :

Cowart DominiqueORCID, Matabos MarjolaineORCID, Brandt Miriam, Marticorena JulienORCID, Sarrazin JozeeORCID (2020). Exploring Environmental DNA (eDNA) to Assess Biodiversity of Hard Substratum Faunal Communities on the Lucky Strike Vent Field (Mid-Atlantic Ridge) and Investigate Recolonization Dynamics After an Induced Disturbance. Frontiers In Marine Science, 6(783), 21p. Publisher's official version : , Open Access version :

Piquet Bérénice, Lallier François H., André Coralie, Shillito Bruce, Andersen Ann C., Duperron Sebastien (2020). Regionalized cell proliferation in the symbiont-bearing gill of the hydrothermal vent mussel Bathymodiolus azoricus. Symbiosis, 82, 225-233.

References of Technical Reports

Cowart DominiqueORCID (2018). Monitoring recolonization dynamics of benthic invertebrate communities at the Lucky Strike hydrothermal vent field using Environmental DNA (eDNA). Postdoctoral Progress Report.

Alix Anne-Sophie, Besson FlorianORCID, Chu Nan-Chin, Fouquet Yves, Lacroix Denis, Le Gall Morgane, Pelleter EwanORCID, Sarradin Pierre-MarieORCID, Ybert Sebastien (2018). Rapport de veille scientifique et technologique relative aux ressources minerales non energetiques des grands fonds. Convention référence 18/2102427980 entre le Ministère de la Transition Ecologique et Solidaire – Direction de l’Eau et de la Biodiversité et l’Institut français de recherche pour l’exploitation de la mer – Action 6.2. REM/2018-016. Rapport n°6.

Le Merdy Abel (2018). Evaluation de l'abondance et de la diversité de la macrofaune associée aux assembalges de modiols de l'édifice hydrothermal Montségur.

Damy Gilbert, Duchi Christophe (2018). Opération simultanée de 2 engins par câble. Analyse des données de la campagne Momarsat (Juillet 2017). REM/RDT/LCSM 2018-058.

Laes AgatheORCID, Sarradin Pierre-MarieORCID, Cathalot CecileORCID, Rimmelin-Maury Peggy, Ouisse VincentORCID, Davy Romain, Munaron DominiqueORCID, Repecaud Michel, Mazeas Florence, Delauney LaurentORCID, Thomas Lena, Salvetat Florence, Waeles Mathieu, Colas FlorentORCID (2018). CR Réunion bilan Chemini Pepito : 13 ans de développement. RDT/LDCM/18-004-ALH/CR.

Blandin Jerome, Coail Jean-Yves, Davy Romain, Fontaine Fabrice, Laes AgatheORCID, Kerboul Andre, Legrand JulienORCID, Moreau Bertrand, Podeur Christian, Sarradin Pierre-MarieORCID (2017). MOMARSAT 2017. N/O Pourquoi pas? Horta – 08/07/2017 - Horta 28/07/2017. Infrastructure d'observation et de transmission de données de l’observatoire EMSO Açores. Compte rendu de mission. REM/RDT/I2M/17-R052.

Sarradin Pierre-MarieORCID, Cannat Mathilde, Blandin Jerome (2017). Compte-rendu opérationnel de la campagne. Momarsat 2017. Zone de travail : Lucky Strike. Insfrastructure de recherche : EMSO-Açores. Navire : Pourquoi Pas? ROV Victor6000. REM/EEP/2017-04.

Thesis using campaign data

Francois David (2021). Dynamique spatiale et temporelle des communautés microbiennes dans les édifices hydrothermaux actifs / Spatial and temporal dynamics of microbial communities in active hydrothermal vents. PhD Thesis, Université de Bretagne Occidentale.