A5082522606- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Flow Measurement and Analysis
- Analytical Chemistry and Sensors
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Marine Bivalve and Aquaculture Studies
- Microbial Community Ecology and Physiology
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Elemental Analysis
- Mercury impact and mitigation studies
- Ocean Acidification Effects and Responses
- Geological and Geophysical Studies
- Marine and fisheries research
- Marine and coastal plant biology
- Oceanographic and Atmospheric Processes
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Fluid Dynamics and Mixing
- Coastal wetland ecosystem dynamics
Ifremer
2016-2025
Centre National de la Recherche Scientifique
2010-2025
Université de Bretagne Occidentale
2023-2025
Institut de physique du globe de Paris
2024
Brest State A.S. Pushkin University
2024
Laboratoire des Sciences du Climat et de l'Environnement
2008-2016
Royal Netherlands Institute for Sea Research
2014-2015
Laboratoire de Biotechnologie et Chimie Marines
2015
Université de Versailles Saint-Quentin-en-Yvelines
2010-2012
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2010-2012
Cold-water coral reefs and adjacent sponge grounds are distributed widely in the deep ocean, where only a small fraction of surface productivity reaches seafloor as detritus. It remains elusive how these hotspots biodiversity can thrive such food-limited environment, data on energy flow organic carbon utilization critically lacking. Here we report situ community respiration rates for cold-water ecosystems obtained by non-invasive aquatic Eddy Correlation technique. Oxygen uptake over Træna...
Abstract. River deltas are particularly important in the marine carbon cycle as they represent transition between terrestrial and carbon: linked to major burial zones, reprocessing zones where large fluxes can be mineralized. In order estimate this mineralization, sediment oxygen uptake rates were measured continental shelf sediments river prodelta over different seasons near outlet of Rhône Mediterranean Sea. On a selected set 10 stations nearby shelf, situ diffusive (DOU) laboratory total...
Abstract. Estuarine regions are generally considered a major source of atmospheric CO2, as result the high organic carbon (OC) mineralization rates in their water column and sediments. Despite this, intensity anaerobic respiration processes sediments tempered by reoxidation reduced metabolites near sediment–water interface controls flux benthic alkalinity. This alkalinity may partially buffer metabolic CO2 generated OC Thus, with could contribute less to local acidification than previously...
Ecosystems face various pressures, often leading to loss of biodiversity. Understanding how biodiversity is spatially structured, what are the driving factors, and ecological evolutionary processes involved essential assess communities' resilience disturbances guide efficient conservation measures. Hydrothermal vents from national waters West Pacific targeted by mining industries for their mineral resources that include metals used in high-tech equipment. Although exploitation has not yet...
Hydrothermal vents are oceanic sources of biogeochemical constituents. Some these constituents, such as iron, significantly contribute to global cycles. Yet, their fate, i.e., transport and mixing through physical processes, modification concentration bio-geochemical remains poorly quantified. Using state-of-the-art physical-biogeochemical (CROCO-PISCES) model simulations that resolve submesoscale internal gravity waves parameterized we analyse the processes involved in dispersion passive...
Ifremer is the French research institute entirely dedicated to ocean. As part of its mission public policy support, Ifremer, sponsored by France, holds two contracts for exploration deep-sea minerals in Area with International Seabed Authority (ISA), one polymetallic nodules Pacific Ocean, other sulphides along Mid-Atlantic Ridge.As per ISA regulations minerals, an contract involves: assessing mineral resources; defining environmental baseline; and monitoring impact activities that could...
With the world’s growing demand for metals, Seafloor Massive Sulfides (SMS) deposits are now seen as a possible mineral resource that could contributes to secure metal supply human needs. Although inactive or extinct SMS likely be main target potential exploitation, only few studies have been devoted them so far. Relict in Trans-Atlantic Geotraverse (TAG) hydrothermal field known since mid-1980s but these so-called sites recently further investigated [1,2,3]. High-resolution acoustic surveys...
Abstract. In situ oxygen microprofiles, sediment organic carbon content, and pore-water concentrations of nitrate, ammonium, iron, manganese, sulfides obtained in sediments from the Rhône River prodelta its adjacent continental shelf were used to constrain a numerical diagenetic model. Results showed that (1) matter is composed fraction fresh material associated high first-order degradation rate constants (11–33 yr−1); (2) burial efficiency (burial/input ratio) (within 3 km river outlet) can...
In the last decade, aquatic eddy correlation (EC) technique has proven to be a powerful approach for non-invasive measurements of oxygen fluxes across sediment water interface. Fundamental EC is turbulent velocity and concentration fluctuations measured with high frequencies in same sampling volume. Oxygen concentrations are commonly fast responding electrochemical microsensors. However, due their own consumption, microsensors sensitive changes diffusive boundary layer surrounding probe thus...
Abstract. In the context of French research project CHACCRA (Climate and Human-induced Alterations in Carbon Cycling at River-seA connection), living (rose Bengal-stained) benthic foraminifera were investigated two stations (24 67 m depth) Rhône prodelta (NW Mediterranean, Gulf Lions). The aim this study was to precise response foraminiferal faunas temporal changes River inputs (e.g. organic terrigeneous material). Each site sampled April 2007, September May 2008 December 2008, permitting...
Abstract The quantification of benthic fluxes with the aquatic eddy correlation (EC) technique is based on simultaneous measurement current velocity and a targeted bottom water parameter (e.g., O 2 , temperature). High-frequency measurements (64 Hz) are performed at single point above seafloor using an acoustic Doppler velocimeter (ADV) fast-responding sensor. advantages EC that 1) it noninvasive, 2) integrates over large area, 3) accounts for in situ hydrodynamics. has gained acceptance as...
The assessment and comparison of food webs across various hydrothermal vent sites can enhance our understanding ecological processes involved in the structure function biodiversity. Menez Gwen, Lucky Strike Rainbow fields are located on Azores triple junction Mid-Atlantic Ridge. These have distinct depths (from 850 to 2320 m) geological contexts (basaltic ultramafic), but share similar faunal assemblages defined by presence foundation species that include Bathymodiolus azoricus, alvinocarid...
Among the endemic and specialized fauna from hydrothermal vents, Rimicaris shrimps constitute one of most important emblematic components these ecosystems. On Mid-Atlantic Ridge, 2 species belonging to this genus co-occur: R. exoculata chacei that differ in their morphology, trophic regime abundance. forms large dense aggregations on active vent chimney walls close proximity fluid emissions, whereas is much less conspicuous, living mostly scattered groups or solitary further away fluids....
Abstract Methylmercury is a potent toxin threatening the global population mainly through consumption of marine fish. Hydrothermal venting directly delivers natural mercury to ocean, yet its flux remains poorly constrained. To determine extent which anthropogenic inputs have increased oceanic levels, it crucial estimate levels. Here we combine observations vent fluids, plume waters, seawater and rock samples quantify release from Trans-Atlantic Geotraverse hydrothermal at Mid-Atlantic Ridge....
The submarine canyons of the Brittany continental slope (Bay Biscay—Northeast Atlantic) were studied to describe conditions in which cold‐water corals occur these areas and their consequences for coral metabolism. Near‐bottom current, oxygen, temperature, particle flux, simultaneously measured 2 yr at 850 m depth, revealed by spectral analysis presence several frequencies with a dominant semidiurnal tidal cycle current direction determined exclusively canyon topography. Sediment trap data...
Ecosystems in the tropical coastal zone exchange particulate organic matter (POM) with adjacent systems, but differences this function among ecosystems remain poorly quantified. Seagrass beds are often a relatively small section of zone, have potentially much larger ecological influence than suggested by their surface area. Using stable isotopes as tracers oceanic, terrestrial, mangrove and seagrass sources, we investigated origin nine bays around island Phuket (Thailand). We used linear...
Abstract Here we report the discovery of a high-temperature hydrothermal vent field on Woodlark Ridge, using ship-borne multibeam echosounding and Remotely Operated Vehicle (ROV) exploration. La Scala Vent Field comprises two main active areas several inactive zones dominated by variably altered basaltic rocks, indicating that an stable circulation has been maintained over long period time. The Pandora Site, at depth 3380 m, is mainly composed diffuse vents. Corto site, 3360 characterized...