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Bernard Quéguiner

Bernard Quéguiner
Université Publique de France

PhD

About

188
Publications
33,114
Reads
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8,770
Citations
Citations since 2016
38 Research Items
3060 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Introduction
Bernard Queguiner is a biological oceanographer involved in plankton studies. He has got experience in coastal (NE Atlantic coast) and offshore pelagic ecosystems (incl. Atlantic, Pacific, Southern Ocean and Mediterranean ecosystems. Main research subjects include biological oceanography, marine biogeochemistry, global silicon cycle, interactions between carbon, nitrogen, phosphorus, silicon and trace-elements in the regulation of phytoplankton productivity and food web community structure.
Additional affiliations
September 1998 - present
Aix-Marseille Université
July 1995 - August 1996
University of California Santa Barbara
Position
  • Sabbatical
January 1986 - September 1998
Université de Bretagne Occidentale
Education
September 1975 - November 1982
Université de Bretagne Occidentale
Field of study
  • Oceanography

Publications

Publications (188)
Article
Full-text available
In this review article, plankton community structure observations are analyzed both for artificial iron fertilization experiments and also for experiments dedicated to the study of naturally iron-fertilized systems in the Atlantic, Indian and Pacific sectors of the Southern Ocean in the POOZ (Permanently Open Ocean Zone) and the PFZ (Polar Frontal...
Article
Full-text available
The Green Edge project was designed to investigate the onset, life, and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in Arctic Ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocea...
Preprint
The Green Edge project was designed to investigate the onset, life and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in arctic ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocean...
Article
Particles located at the interface between the surface ocean layer and the top of the mesopelagic domain are the initial vector of the biological pump yet, their nature is still largely unknown. During the MOBYDICK cruise in the vicinity of the Kerguelen Islands (Indian sector of the Southern Ocean) we deployed a recently available device that conc...
Article
Full-text available
This study aimed to quantify the impact of copepod grazing on the productivity of phytoplankton during an under sea-ice spring phytoplankton bloom (USPB) in western Baffin Bay. To quantify positive and/or negative impacts of copepod grazing on primary production and the interaction between copepod grazing and phytoplankton species, we sampled seawa...
Article
Full-text available
In the context of climate change, understanding the ecological processes controlling the functioning and the efficiency of the biological pump is of primary importance. Plankton community structure and species-specific properties are often invoked as likely to affect biogeochemistry and the export of organic and biogenic material to the ocean inter...
Article
Full-text available
The Green Edge initiative was developed to investigate the processes controlling the primary productivity and fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Two field campaigns were conducted in 2015 and 2016 at an ice camp located on landfast sea ice southeast of Qikiq...
Article
Full-text available
The Arctic Ocean is particularly affected by climate change, with changes in sea ice cover expected to impact phytoplankton primary production. During the Green Edge expedition, the development of the late spring–early summer diatom bloom was studied in relation with the sea ice retreat by multiple transects across the marginal ice zone. Biogenic s...
Article
Full-text available
The Arctic Ocean is particularly affected by climate change, with changes in sea ice cover expected to impact phytoplankton primary production. During the Green Edge expedition, the development of the late spring–early summer diatom bloom was studied in relation with the sea ice retreat by multiple transects across the marginal ice zone. Biogenic s...
Article
Full-text available
The Green Edge initiative was developed to investigate the processes controlling the primary productivity and the fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Two field campaigns were conducted in 2015 and 2016 at an ice camp located on landfast sea ice southeast of Q...
Presentation
Full-text available
Results acquired over more than two decades now make it possible to outline the functioning of the pelagic ecosystem off the Kerguelen Islands. Although the structuring role of natural iron fertilization has been demonstrated both in terms of productivity and the structuring of pelagic communities, recent results raise questions about the paradigm...
Poster
Full-text available
The MOBYDICK program runs from 2017 to 2021. The major milestone has been the oceanographic cruise, which took place from 18 February to 27 March 2018 in the Indian sector of the Southern Ocean, off the Kerguelen Islands, onboard the N.O. Marion Dufresne. The MOBYDICK team studies end-to-end food webs in contrasted environments under HNLC context i...
Article
Full-text available
This article presents data regarding the Si biogeochemical cycle during two oceanographic cruises conducted in the tropical South Pacific (BIOSOPE and OUTPACE cruises) in 2005 and 2015. It involves the first Si stock measurements in this understudied region, encompassing various oceanic systems from New Caledonia to the Chilean upwelling between 8...
Article
Full-text available
This article presents data regarding the Si biogeochemical cycle during two oceanographic cruises conducted in the Southern Tropical Pacific (BIOSOPE and OUTPACE cruises) in 2005 and 2015. It involves the first Si stock measurements in this understudied region, encompassing various oceanic systems from New Caledonia to the Chilean upwelling between...
Poster
Full-text available
The Southern Ocean is a major component of the Earth system undergoing rapid transitions due to global change. With regards to the CO 2 problem, part of the response of the Earth system is controlled by the oceanic biological carbon pump, which is responsible for establishing the pCO 2 gradient between atmosphere and surface waters, while being als...
Article
Full-text available
Diatoms are one of the major primary producers in the ocean, responsible annually for ~20% of photosynthetically fixed CO2 on Earth. In oceanic models, they are typically represented as large (>20 µm) microphytoplankton. However, many diatoms belong to the nanophytoplankton (2–20 µm) and a few species even overlap with the picoplanktonic size-class...
Article
Full-text available
Competition is a central part of the evolutionary process, and silicification is no exception: between biomineralized and non-biomineralized organisms, between siliceous and non-siliceous biomineralizing organisms, and between different silicifying groups. Here we discuss evolutionary competition at various scales, and how this has affected biogeoc...
Presentation
Silicifiers are among the most important organisms on planet Earth. Among them, diatoms play a key role in the trophic networks of the most productive coastal and open-ocean ecosystems, as well as in the biology-mediated transfer of CO 2 from the surface to the ocean interior. However, many gaps remain regarding their quantification at global scale...
Presentation
Full-text available
Presentation of first results from the 2015 Qikiqtarjuaq Ice Camp - Green Edge Project
Presentation
Full-text available
Presentation of first results from the Baffin Bay Expedition 2016 (NGCC Amundsen) - Green Edge Project
Article
Full-text available
Accepted: 5th August 2016. Abstract: In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the High Nutrient Low Chlorophyll (HNLC) surrounding waters. The large iron-induced blooms were...
Data
In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the High Nutrient Low Chlorophyll (HNLC) surrounding waters (October-November 2011, KEOPS 2). The large iron-induced blooms were domin...
Chapter
Although silicification is a widespread process for many marine organisms, the cellular mechanisms of biogenic silica deposition were principally described for the group of diatoms. This is directly related to the capacity of the diatoms to modulate the width of the frustule according to the availability of orthosilicic acid. Riedel and Nelson had...
Chapter
In the early 1980s, the first estimates of biogenic silica production in the Global Ocean resulted in relatively similar values. The relative contribution of diatoms in the production of marine ecosystems is extremely variable and always quite poorly quantified. The molar ratios Si/C were subsequently measured on the living diatoms grown under non-...
Chapter
All marine waters are undersaturated with biogenic silica. As with other inorganic macronutrients, increased concentrations of orthosilicic acid in deep waters reflect a regeneration process. This is essentially physicochemical in nature, mainly controlled by temperature, pressure and structure of the siliceous matrix and the ambient concentration...
Chapter
Natural silicon is a metalloid that actually corresponds to a mixture of three stable isotopes. Dissolved silicon in seawater is present in various chemical forms, eventually available to living organisms. The most abundant form is orthosilicic acid, which has the molecular formula orthosilicic acid and is a tetraprotonated acid. At a pH value clos...
Chapter
The determination of orthosilicic acid is generally carried out by spectrophotometry according to the colorimetric method of Mullin and Riley, adapted by Strickland and Parsons. Early techniques that have been implemented (X-ray diffraction, infrared spectroscopy, digestion with hydrofluoric acid (HF) and colorimetric analysis of orthosilicic acid)...
Chapter
The study of silicon biogeochemistry makes sense only insofar as it helps to understand the relationship with other major elements involved in marine biogeochemistry, particularly in relation to climate change and the modulatory role of living organisms. The preservation of calcite in the ocean is determined by the large-scale circulation of deep w...
Chapter
In the marine environment, silicification is a process that occurs in many unicellular and pluricellular organisms. Silicification, long considered as the only privilege of diatoms, radiolarians and sponges, seems today much more widespread within the planktonic organisms, independent of their size class. The radiolarians can be classified into two...
Book
Full-text available
In the biogeochemical dynamics of marine ecosystems, silicon is a major element whose role has, for a long time, been underestimated. It is however indispensable to the activity of several biomineralizing marine organisms, some of which play an essential role in the biological pump of oceanic carbon.This book presents notions indispensable to the k...
Book
Dans la dynamique biogéochimique des écosystèmes marins, le silicium est un élément majeur dont le rôle a longtemps été sousestimé. Il est pourtant indispensable à l’activité de plusieurs organismes biominéralisateurs marins, dont certains jouent un rôle essentiel dans la pompe biologique du carbone océanique. Cet ouvrage apporte les notions indis...
Article
Full-text available
In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the high nutrient, low chlorophyll (HNLC) surrounding waters. The large iron-induced blooms were dominated by small diatom species bel...
Article
Full-text available
Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Circumpolar Current and the local bathymetry. Net primary prod...
Article
Full-text available
The dispersion of a patch of the tracer sulfur hexafluoride (SF6) is used to assess the lateral diffusivity in the coastal waters of the western part of the Gulf of Lion (GoL), northwestern Mediterranean Sea, during the Latex10 experiment (September 2010). Immediately after the release, the spreading of the patch is associated with a strong decreas...
Article
Full-text available
The biological composition of the material exported to a moored sediment trap located under the winter mixed layer of the naturally fertilized Kerguelen Plateau in the Southern Ocean was studied over an annual cycle. Despite iron availability in spring, the annual particulate organic carbon (POC) export (98.2 mmol m −2) at 289 m was low, but annual...
Conference Paper
Full-text available
Priority Sheet on Arctic oceanography towards the 3rd International Conference on Arctic Research Planning (ICARPIII)
Article
Full-text available
We examined phytoplankton community responses to natural iron fertilisation at 32 sites over and downstream from the Kerguelen Plateau in the Southern Ocean during the austral spring bloom in October–November 2011. The community structure was estimated from chemical and isotopic measurements (particulate organic carbon – POC; 13C-POC; particulate n...
Article
Full-text available
The chemical (particulate organic carbon and nitrogen, biogenic silica) and biological (diatoms and faecal pellets) composition of the material exported to a moored sediment trap located under the winter mixed layer of the naturally-fertilized Kerguelen Plateau in the Southern Ocean was studied over an annual cycle. Despite iron availability in spr...
Article
Full-text available
Although the Southern Ocean is considered a High Nutrient Low Chlorophyll area (HNLC), massive and recurrent blooms are observed over and downstream the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Circumpolar Current and the local bathymetry. Net primary producti...
Article
Full-text available
A massive diatom-bloom is observed each year in the surface waters of the naturally Fe fertilized Kerguelen Plateau (Southern Ocean). We measured biogenic silica production and dissolution fluxes (ρSi and ρDiss respectively) in the mixed layer in the vicinity of the Kerguelen Plateau during austral spring 2011 (KEOPS-2 cruise). We compare results f...
Article
Full-text available
A massive diatom bloom is observed each year in the surface waters of the naturally Fe-fertilized Kerguelen Plateau (Southern Ocean). We measured biogenic silica production and dissolution fluxes (ρSi and ρDiss, respectively) in the mixed layer in the vicinity of the Kerguelen Plateau during austral spring 2011 (KEOPS-2 cruise). We compare results...
Conference Paper
Full-text available
This work aims at assessing the role of plankton in the transfer of PCBs to higher trophic levels in the Gulf of Lions by coupling biogeochemical and hydrodynamical processes and taking into account the physico-chemical properties of PCBs (PCB153 and PCB28). Plankton plays a key role in biogeochemical cycles of PCBs in aquatic environments. Since p...
Article
Full-text available
We examined phytoplankton community responses to natural iron fertilisation at 32 sites over and downstream from the Kerguelen Plateau in the Southern Ocean during the austral spring bloom in October–November 2011. Community structure was estimated from chemical and isotopic measurements (particulate organic carbon POC, 13C-POC, particulate nitroge...
Article
Full-text available
The particulate matter distribution and phytoplankton community structure of the iron-fertilized Kerguelen region were investigated in early austral spring (October-November 2011) during the KEOPS2 cruise. The iron-fertilized region was characterized by a complex mesoscale circulation resulting in a patchy distribution of particulate matter. Integr...
Article
Full-text available
The particulate matter distribution and phytoplankton community structure of the iron-fertilized Kerguelen region were investigated in early austral spring (October–November 2011) during the KEOPS2 cruise. The iron-fertilized region was characterized by a complex mesoscale circulation resulting in a patchy distribution of particulate matter. Integr...
Technical Report
Full-text available
« La géo‐ingénierie de l’environnement correspond à l’ensemble des techniques et pratiques mises en oeuvre ou projetées dans une visée corrective à grande échelle d’effets de la pression anthropique sur l’environnement. Il importe de bien distinguer la géo‐ingénierie qui met en jeu des mécanismes ayant un impact global sur le système planétaire ter...
Article
Full-text available
Mean currents, horizontal diffusivity and upwelling on the Kerguelen Plateau and the deep basin east of the Kerguelen Islands were studied using 48 World Ocean Circulation Experiment (WOCE) Standard Surface Velocity Program (SVP) drifters deployed during the 2011 austral spring KEOPS II (KErguelen Ocean Plateau compared Study II) cruise. These drif...
Technical Report
Full-text available
Engagé en septembre 2012, l’ARP REAGIR est consacré à la géo-ingénierie environnementale. La réflexion a été menée par des chercheurs, en sciences sociales et naturelles, et des experts des secteurs publics et privés. Les solutions imaginées de géo-ingénierie ont été analysées à différentes échelles spatio-temporelles avec une vision large et aussi...
Article
Full-text available
The 3D hydrodynamic Model for Applications at Regional Scale (MARS3D) was coupled with a biogeochemical model developed with the Ecological Modular Mechanistic Modelling (Eco3M) numerical tool. The three-dimensional coupled model was applied to the NW Mediterranean Sea to study the dynamics of the key biogeochemical processes in the area in relatio...
Conference Paper
Full-text available
This work aims at assessing the role of plankton in the transfer of PCBs to higher trophic levels in the Gulf of Lions by coupling biogeochemical and hydrodynamical processes and taking into account the physico-chemical properties of PCBs (PCB153 and PCB28). Plankton plays indeed a key role in biogeochemical cycles of PCBs in aquatic environments....
Conference Paper
Full-text available
This work aims at assessing the role of plankton in the transfer of PCBs to higher trophic levels in the Gulf of Lions by coupling biogeochemical and hydrodynamical processes and taking into account the physico-chemical properties of PCBs (PCB153 and PCB28). Plankton plays indeed a key role in biogeochemical cycles of PCBs in aquatic environments....