Descriptor: "UBO" / Topic: acl - Searchworks@Jio Institute Digital Library Search Results

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28 results on '"UBO"'

1. Mass-independent and mass-dependent Cr isotopic composition of the Rumuruti (R) chondrites: Implications for their origin and planet formation

Author: Martin Schiller, Jean-Alix Barrat, Frédéric Moynier, Conel M. O'd. Alexander, Martin Bizzarro, Addi Bischoff, Ke Zhu, Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Centre for Star and Planet Formation (STARPLAN), Globe Institute, Faculty of Health and Medical Sciences, University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Health and Medical Sciences, University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH), Carnegie Institution for Science, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut für Planetologie [Münster], Westfälische Wilhelms-Universität Münster = University of Münster (WWU), F. M. acknowledges funding from the European Research Council under the H2020 framework program/ERC grant agreement (ERC starting grant, #637503-PRISTINE) and financial support of the UnivEarthS Labex program at Université de Paris (#ANR-10-LABX-0023 and #ANR-11-IDEX-0005-02), and the IPGP platform PARI, and the Region Île-de-France Sesame grant no. 12015908. M. S. acknowledges funding from the Villum Fonden (#00025333). M. B. acknowledges funding from the Carlsberg Foundation (#CF18-1105), the Danish National Research Foundation (#DNRF97) and the European Research Council (ERC Advanced Grant Agreement, #833275-DEEPTIME). A. B. thanks the support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, #263649064) – TRR 170 (subproject B05). This is TRR170 Publication No. 116. K. Z. thanks the China Scholarship Council (CSC) for the PhD fellowship (#201706340161) and IPGP for the funding support of traveling, 'Aide à la MOBILITE INTERNATIONALE des doctorants de l’IPGP' (2019), to visit Earth and Planetary Laboratory, Carnegie Institution for Science., ANR-10-LABX-0023,UnivEarthS,Earth - Planets - Universe: observation, modeling, transfer(2010), ANR-11-IDEX-0005,USPC,Université Sorbonne Paris Cité(2011), European Project: 637503,H2020,ERC-2014-STG,PRISTINE(2015), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU)-Faculty of Health and Medical Sciences, University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), Carnegie Institution for Science [Washington], Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Westfälische Wilhelms-Universität Münster (WWU)
Subjects: chondrules, cr-54, 010504 meteorology & atmospheric sciences, oxygen-isotope, Geochemistry, EARLY SOLAR-SYSTEM, earth, Ureilite, engineering.material, CHEMICAL-COMPOSITION, 010502 geochemistry & geophysics, 01 natural sciences, Cosmochemistry, CR-54, Geochemistry and Petrology, Chondrite, Cr stable isotopes, QUANTITATIVE MODELS, EARTH, fractionation, UBO, 0105 earth and related environmental sciences, Isotope, Chemistry, FRACTIONATION, ACL, METEORITE, Chondrule, Cr-54 nucleosynthetic anomalies, CHONDRULES, Rumuruti Chondrites, meteorite, OXYGEN-ISOTOPE, Mn-53-Cr-53 chronometry, Planetary science, 13. Climate action, DISCOVERY, Enstatite, engineering, Chondritic clast, quantitative models, chemical-composition, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, early solar-system, Planetary differentiation
Abstract: WOS:000600550100030; International audience; Chromium (Cr) isotopes play an important role in cosmochemistry and planetary science because they are powerful tools for dating (Mn-53-Cr-53 short-lived chronometry), tracing (Cr-54 nucleosynthetic anomalies) the origins of the materials, and studying the processes involved in volatile element fractionation and planetary differentiation (Cr stable isotopic fractionation). To use Cr isotopes for these purposes, it is essential to precisely know the compositions of the various chondritic reservoirs. However, the Cr isotope composition of Rumuruti (R) chondrites remains unknown. Here, we report high-precision mass-independent (average 2SE uncertainty of similar to 0.02 and similar to 0.06 for epsilon Cr-53 and epsilon Cr-54, respectively; epsilon indicates 10,000 deviation) and mass-dependent (uncertainty of average 0.03 parts per thousand for delta Cr-53; .delta indicates 1000 deviation) Cr isotope data for 12 bulk R chondrites of petrologic types 3-6 (including R chondrite breccias), and one R chondrite-like clast (MS-CH) in the Almahata Sitta polymict ureilite. All the R chondrites show homogeneous bulk epsilon Cr-54 values, -0.06 +/- 0.08 (2SD), similar only to those of the Earth-Moon system and enstatite chondrites. This first epsilon Cr-54 dataset for R chondrites provides significant addition to the epsilon Cr-54-A, Delta O-17 diagram, and positions them as a potential endmember for planetary precursors. The R chondrites possess a higher Mn-55/Cr-52 of 0.68 +/- 0.04 relative to most of carbonaceous chondrites and higher epsilon Cr-53 values 0.23 +/- 0.05 (2SD) relative to most of chondrite groups. This likely results from the lower chondrule abundance in R chondrites compared to that of ordinary and enstatite chondrites. The stable Cr isotope composition of R chondrites is homogeneous with a delta Cr-53 = -0.12 +/- 0.03%e (2SD). Combined with previous data of other groups of chondrites, we show that the stable Cr isotopic composition of all the chondrites is homogeneous with delta Cr-53 of -0.12 +/- 0.04%e (2SD, N = 42) and is independent of the petrologic type and redox conditions. The lack of mass-dependent fractionation between all groups of chondrites suggests that the average chondrite delta Cr-53 value is also representative for the initial composition of all differentiated planets in the Solar System. Finally, the MS-CH clast in Almahata Sitta has a Cr isotopic composition (epsilon Cr-53 = 0.18 +/- 0.04, epsilon Cr-54 = 0.16 +/- 0.07, and delta Cr-53 = -0.11 +/- 0.05%e) that is consistent (within error) with it being an R chondrite-like clast. (C) 2020 Elsevier Ltd. All rights reserved.
Published: 2021
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2. Ultra‐diluted bioactive compounds enhance energy storage and oocyte quality during gonad conditioning of Pacific calico scallop Argopecten ventricosus (Sowerby II, 1842)

Author: Fernando Abasolo-Pacheco, Guadalupe Fabiola Arcos-Ortega, Jesús Antonio López-Carvallo, José Manuel Mazón-Suástegui, Carmen Rodríguez-Jaramillo, José Luis García-Corona, Centro de Investigaciones Biologicas del Noroeste [Mexico] (CONACYT-CIBNOR), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Universidad Técnica Estatal de Quevedo (UTEQ)
Subjects: Gonad, antioxidant response, homeopathic medicines, panorama, aquacultural homeopathy, Aquatic Science, Biology, survival, Argopecten ventricosus, Energy storage, gametogenesis, 03 medical and health sciences, 0302 clinical medicine, Botany, medicine, oxidative stress, 14. Life underwater, lion-paw scallop, SUD, UBO, pecten-maximus, 030304 developmental biology, Calico, 0303 health sciences, ACL, Oocyte, 030205 complementary & alternative medicine, scallop, medicine.anatomical_structure, nutrient management, physiology, Scallop, tilapia oreochromis-niloticus, oocyte quality, bioenergetics of reproduction, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, performance
Abstract: WOS:000591249000001; Ultra-diluted bioactive compounds have emerged as an alternative to enhance marine organism performance and to improve broodstock gonad maturation. This study evaluated for the first time the effect of three homeopathically ultra-diluted bioactive compounds (HUBC's) authorized by the health authority as medicines for humans, on the general reproductive physiology of Argopecten ventricosus, a commercially important scallop species. The experiment included three HUBC's treatments at centesimal dilution assessed in triplicate under laboratory conditions, T1: PaV-30C + PhA-30C, T2: PaV-30C + SiT-30C, and T3: ViT-30C, and a non-treated field reference group (FRG) maintained in aquaculture facilities as reference. The bioenergetics of scallop reproduction and oocyte quality increased with the three HUBC treatments, but particularly in those treated with T2. The organisms treated with T3 showed not only the highest proliferation of vitellogenic and post-vitellogenic oocytes but also the greatest oxidative damage in tissues and oocytes. In contrast, the scallops from T1 and T2 showed less oxidative damage. The results suggest that ultra-diluted formula T2 is a potential alternative to optimize A. ventricosus gonad ripening, food-nutrient management and oocyte quality because although T3 allowed accelerating the gametogenesis process, it increased oxidative damage. This study could help to improve gonad broodstock condition and larval yield of this species in hatcheries.
Published: 2020
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3. A 45-year sub-annual reconstruction of seawater temperature in the Bay of Brest, France, using the shell oxygen isotope composition of the bivalve Glycymeris glycymeris

Author: Melita Peharda, Bernd R. Schöne, Julien Thébault, Amy M. Featherstone, Paul G. Butler, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Bioscience [Aarhus], University of Exeter, Institute of Geosciences [Mainz], Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Institute of Oceanography and Fisheries, European Project: 604802,EC:FP7:PEOPLE,FP7-PEOPLE-2013-ITN,ARAMACC(2013), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Johannes Gutenberg - Universität Mainz (JGU)
Subjects: Archeology, 010504 meteorology & atmospheric sciences, SPG, aragonite, 01 natural sciences, Isotopes of oxygen, Sclerochronology, nao, pecten-maximus, Global and Planetary Change, Ecology, biology, spg, Stable isotope ratio, high-resolution proxy records, EAP, temperature reconstruction, Oceanography, climate-change, northern-hemisphere temperatures, Geology, 010506 paleontology, growth, forecast, ARAMACC_FP7-PEOPLE-2013-ITN, dog cockle, stable isotopes, engineering.material, climate signals, NAO, sclerochemistry, sclerochronology, eap, 14. Life underwater, UBO, 0105 earth and related environmental sciences, Earth-Surface Processes, Glycymeris, variability, ACL, Aragonite, marine, resolution, Paleontology, atlantic subpolar gyre, biology.organism_classification, 13. Climate action, DISCOVERY, engineering, Seawater, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Bay, Dog cockle
Abstract: A reconstruction of sea surface temperature (SST) spanning 45 years (1966–2011) was developed from δ18O obtained from the aragonitic shells of Glycymeris glycymeris, collected from the Bay of Brest, France. Bivalve sampling was undertaken monthly between 2014 and 2015 using a dredge. In total, 401 live specimens and 243 articulated paired valves from dead specimens were collected, of which 24 individuals were used to reconstruct SST. Temperatures determined using the palaeotemperature equation of Royer et al. compared well with observed SST during the growing season between 1998 and 2010 (Pearson’s correlation: p = 0.002, r = 0.760). Furthermore, a significant negative correlation was found between the reconstructed SST and the North Atlantic Subpolar Gyre (SPG) index ( p = 0.001, r = −0.50), and a significant positive correlation was found with the East Atlantic Pattern (EAP) index when the reconstructed SST was lagged by 1 year ( p = 0.002, r = 0.46). This led to the conclusion that EAP and SPG are major influences on SSTs in the Bay of Brest. As the SPG controls air temperature in Northern Europe and the EAP controls water temperature in Southern Europe, this suggests that the Bay of Brest is an interaction area between these two climate systems. As such, this locality is interesting as the δ18O of the shells can be used as a proxy for both the SPG and EAP, and temperature reconstructions can provide a unique insight into how these climate systems interacted prior to the instrumental era.
Published: 2019
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4. Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage: insights from mercury stable isotopes

Author: Raul Octavio Martinez Rincon, James T. Ketchum, Gaël Le Croizier, David Point, Felipe Galván-Magaña, Lucien Besnard, Gauthier Schaal, Edouard Kraffe, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Instituto Politecnico Nacional [Mexico] (IPN), Pelagios Kakunjá, Centro de Investigaciones Biologicas del Noroeste [Mexico] (CONACYT-CIBNOR), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Lucien Besnard doctoral grant was funded by the École Doctorale des Sciences de la Mer et du Littoral (EDSML) and by the Université de Bretagne Occidentale (UBO). The project is supported by ISblue project, interdisciplinary graduate school for the blue planet (ANR-17-EURE-0015) and co-funded by a grant from the French government under the program 'Investissements d’Avenir'. It is also backed by MIC ERASMUS+ and Ecos Annuies projects. Gaël Le Croizier was supported by a postdoctoral grant from the French National Research Institute for Sustainable Development (IRD). Mercury concentration and stable isotopic analyses were financially supported by the French National Research Agency (project ANR-17-CE34-0010 MERTOX, PI David Point). Felipe Galván-Magaña thanks the Instituto Politecnico Nacional for fellowships (COFAA, EDI)., ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017), ANR-17-CE34-0010,MERTOX,Découvrir l'origine de la toxine methylmercure dans les écosystèmes marins(2017), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)
Subjects: Isurus, Food Chain, 010504 meteorology & atmospheric sciences, Top predator, Mesopelagic zone, Health, Toxicology and Mutagenesis, Mercury accumulation, Foraging, Foraging depth, 010501 environmental sciences, Toxicology, 01 natural sciences, Hammerhead shark, Trophic ecology, Animals, 14. Life underwater, Resource partitioning, SUD, UBO, Ecosystem, 0105 earth and related environmental sciences, Apex predator, Trophic level, Carbon Isotopes, Nitrogen Isotopes, biology, ANR-17-EURE-0015, Ecology, ACL, Prionace glauca, Mercury, General Medicine, biology.organism_classification, Pollution, Mercury stable isotopes, Mercury Isotopes, Seafood, Shortfin mako shark, DISCOVERY, Sharks, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, MERTOX_ ANR-17-CE34-0010
Abstract: International audience; The decline of shark populations in the world ocean is affecting ecosystem structure and function in an unpredictable way and new ecological information is today needed to better understand the role of sharks in their habitats. In particular, the characterization of foraging patterns is crucial to understand and foresee the evolution of dynamics between sharks and their prey. Many shark species use the mesopelagic area as a major foraging ground but the degree to which different pelagic sharks rely on this habitat remains overlooked. In order to depict the vertical dimension of their trophic ecology, we used mercury stable isotopes in the muscle of three pelagic shark species (the blue shark Prionace glauca, the shortfin mako shark Isurus oxyrinchus and the smooth hammerhead shark Sphyrna zygaena) from the northeastern Pacific region. The Δ199Hg values, ranging from 1.40 to 2.13‰ in sharks, suggested a diet mostly based on mesopelagic prey in oceanic habitats. We additionally used carbon and nitrogen stable isotopes (δ13C, δ15N) alone or in combination with Δ199Hg values, to assess resource partitioning between the three shark species. Adding Δ199Hg resulted in a decrease in trophic overlap estimates compared to those based on δ13C/δ15N alone, demonstrating that multi-isotope modeling is needed for accurate trophic description of the three species. Mainly, it reveals that they forage at different average depths and that resource partitioning is mostly expressed through the vertical dimension within pelagic shark assemblages. Concomitantly, muscle total mercury concentration (THg) differed between species and increased with feeding depth. Overall, this study highlights the key role of the mesopelagic zone for shark species foraging among important depth gradients and reports new ecological information on trophic competition using mercury isotopes. It also suggests that foraging depth may play a pivotal role in the differences between muscle THg from co-occurring high trophic level shark species.
Published: 2021
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5. Amino-nanopolystyrene exposures of oyster (Crassostrea gigas) embryos induced no apparent intergenerational effects

Author: A. Huvet, Christophe Lambert, C. Bourdon, Bruno Petton, Claudie Quéré, Anne-Laure Cassone, Philippe Soudant, Myrina Boulais, Ika Paul-Pont, I. Bernardini, Antoine Bideau, Marianne Alunno-Bruscia, Caroline Fabioux, N. Le Goïc, F. Le Grand, Kevin Tallec, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Universita degli Studi di Padova, Department of Physical Sciences, Earth and Environment [Siena] (DSFTA), Università degli Studi di Siena = University of Siena (UNISI), This study was supported by the Agence Nationale de la Recherche (ANR) – Nanoplastics project (ANR-15-CE34-0006)., ANR-15-CE34-0006,Nanoplastics,Microplastiques, nanoplastiques dans l'environnement marin: caractérisation, impacts et évaluation des risques sanitaires.(2015), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Università degli Studi di Padova = University of Padua (Unipd)
Subjects: Oyster, animal structures, CNRS, Biomedical Engineering, Zoology, panorama, 02 engineering and technology, larval performances, Toxicology, 03 medical and health sciences, biology.animal, 14. Life underwater, UBO, 030304 developmental biology, 0303 health sciences, embryonic exposure, biology, offspring, ACL, fungi, Pelagic zone, Embryo, Marine invertebrates, 021001 nanoscience & nanotechnology, biology.organism_classification, Early life, nanoplastics, Crassostrea, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, 0210 nano-technology, Ifremer, human activities
Abstract: WOS:000616240600001; International audience; Early life stages (ELS) of numerous marine invertebrates mustcope with man-made contaminants, including plastic debris, during their pelagic phase. Among the diversity of plastic particles, nano-sized debris, known as nanoplastics, can induce effects with severe outcomes in ELS of various biological models, including the Pacific oyster Crassostrea gigas. Here, we investigated the effects of a sub-lethal dose (0.1 mu g mL(-1)) of 50 nm polystyrene nanobeads (nano-PS) with amine functions on oyster embryos (24 h exposure) and we assessed consequences on larval and adult performances over two generations of oysters. Only a few effects were observed. Lipid analyses revealed that first-generation (G1) embryos exposed to nano-PS displayed a relative increase in cardiolipin content (+9.7%), suggesting a potential modification of mitochondrial functioning. G1-larvae issued from exposed embryos showed decreases in larval growth (-9%) and lipid storage (-20%). No effect was observed at the G1 adult stage in terms of growth, ecophysiological parameters (clearance and respiration rates, absorption efficiency), or reproductive outputs (gonadic development, gamete quality). Second generation (G2) larvae issued from control G1 displayed a significant growth reduction after G2 embryonic exposure to nano-PS (-24%) compared to control (as observed at the first generation), while no intergenerational effect was detected on G2 larvae issued from G1 exposed embryos. Overall, the present experimental study suggests a low incidence of a short embryonic exposure to nano-PS on oyster phenotypes along the entire life cycle until the next larval generation.
Published: 2021
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6. The silent spring of Sargassum

Author: Ronan Pierre, Valérie Stiger-Pouvreau, Damien A. Devault, Victoire Cottereau, Alexandra Coynel, Franck Dolique, Emma Modestin, Fabien Vedie, Centre Universitaire de Formation et de Recherche de Mayotte (CUFR), Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Migrations internationales, espaces et sociétés (MIGRINTER UMR 7301), Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, DEAL Martinique, MEDDTL, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude et de Valorisation des Algues (CEVA), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Health, Toxicology and Mutagenesis, panorama, 010501 environmental sciences, 01 natural sciences, Spring (hydrology), Environmental Chemistry, Ecotoxicology, alginate, seafood, UBO, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, biology, Ecology, 010604 marine biology & hydrobiology, ACL, carbon, Sargassum, General Medicine, biology.organism_classification, Pollution, Outremer, speciation, seaweed, transport, extraction, Environmental science, Seasons, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: WOS:000607369700001
Published: 2021
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7. Extending community trajectory analysis: New metrics and representation

Author: Nicolas Desroy, Martina Sánchez-Pinillos, M. De Cáceres, P. Le Mao, Gauthier Schaal, A. Ponsero, A. Sturbois, Olivier Gauthier, VivArmor Nature, Réserve Naturelle Nationale Baie St-Brieuc, Réserves Naturelles de France-Réserves Naturelles de France, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Environnement Ressource Bretagne Nord (LERBN), LITTORAL (LITTORAL), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Joint Research Unit CTFC – AGROTECNIO, Solsona, Spain, Centre for Forest Research (CEF), Department of Chemistry, University of Québec in Montréal, Faculty of Forestry and Environmental Management, University of New Brunswick (UNB), Centre De Recherche et d'Enseignement sur les Systèmes Côtiers (CRESCO), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Initial state, Computer science, Impact assessment, Trajectory analysis, Space (commercial competition), Machine learning, computer.software_genre, 010603 evolutionary biology, 01 natural sciences, Ecological variability, EU-FEAMP 621-B, Baseline (configuration management), Set (psychology), UBO, Community dynamics, Complement (set theory), business.industry, 010604 marine biology & hydrobiology, Ecological Modeling, ACL, Representation (systemics), 15. Life on land, Toolbox, Complementarity (molecular biology), DISCOVERY, Trajectory, Artificial intelligence, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, business, computer, Representation tools
Abstract: WOS:000614806200005; Ecological research focuses on the spatio-temporal patterns of ecosystems and communities. The recently proposed framework of Community Trajectory Analysis considers community dynamics as trajectories in a chosen space of community resemblance and utilizes geometrical properties of trajectories to compare and analyse temporal changes. Here, we extend the initial framework, which focused on consecutive trajectory segments, by considering additional metrics with respect to initial or baseline states. Addressing questions about community dynamics and more generally temporal and spatial ecological variability requires synthetic and efficient modes of representation. Hence, we propose a set of innovative maps, charts and trajectory roses to represent trajectory properties and complement the panel of traditional modes of representation used in community ecology. We use four case studies to highlight the complementarity and the ability of the new metrics and innovative figures to illustrate ecological trajectories and to facilitate their interpretation. Finally, we encourage ecologists skilled in multivariate analysis to integrate CTA into their toolbox in order to quantitatively evaluate spatio-temporal changes.
Published: 2021
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8. A New Protocol Using Acidification for Preserving DMSP in Macroalgae and Comparison with Existing Protocols

Author: Solène Connan, Valérie Stiger-Pouvreau, Eva Bucciarelli, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, macroalgae, CNRS, chibido, Sulfonium Compounds, panorama, Plant Science, Common method, Aquatic Science, Biology, Dimethylsulfoniopropionate, freezing, 010603 evolutionary biology, 01 natural sciences, Ulva, Hydrolysis, chemistry.chemical_compound, acidification, Chondrus crispus, storage protocol, Bifurcaria bifurcata, drying, DMSP, UBO, 010604 marine biology & hydrobiology, ACL, Significant difference, Ulva compressa, Hydrogen-Ion Concentration, Seaweed, biology.organism_classification, dmsp, chemistry, Environmental chemistry, DISCOVERY, Gas chromatography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: WOS:000614643900001; Dimethylsulfoniopropionate (DMSP) plays many important physiological and ecological roles in macroalgae. The most common method to measure DMSP is by gas chromatography analysis of the dimethylsulfide (DMS) produced after NaOH hydrolysis (pH \textgreater 12). Storage of DMS, however, is not recommended for more than a week. We investigated if acidification can be a suitable method to preserve DMSP in macroalgal samples over three months of storage, compared to widely used protocols such as drying and freezing at -20 degrees C. The DMSP content of green (Ulva sp. and Ulva compressa), red (Chondrus crispus), and brown (Bifurcaria bifurcata) macroalgae were analyzed: 24 h after NaOH addition (control values); and after acidification (0.2 mol center dot L HCl-1) for 24 h of fresh material, followed by NaOH addition for 24 h. These values were compared to measurements after 3-month storage of samples that had been either dried in a heater (60 degrees C for a night, and storage at room temperature), or frozen at -20 degrees C, or kept in 0.2 mol center dot L HCl-1. There was no significant difference between DMSP measurements on freshly collected material and after acidification of the samples, whether 24 h later or after 3 months of storage. This was in contrast to 3-month storage protocols involving overnight drying at 60 degrees C (75-98% DMSP loss), and to a lesser degree freezing at -20 degrees C (37-80% DMSP loss). We thus advise to acidify macroalgal samples for preservation over long periods of time rather than drying or freezing, when assaying DMSP content.
Published: 2021
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9. Phidianidine A and Synthetic Analogues as Naturally Inspired Marine Antifoulants

Author: Karine Réhel, Lindon W. K. Moodie, Johan Svenson, Jannie Staffansson, Christophe Labriere, Hugo Denardou, Gunnar Cervin, Jørn H. Hansen, Henrik Pavia, Claire Hellio, Vijayaragavan Elumalai, Tiffany Le Norcy, Department of Chemistry [Tromsø], University of Tromsø (UiT), Department of Marine Sciences [Gothenburg], University of Gothenburg (GU), Laboratoire de Biotechnologie et Chimie Marines (LBCM), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Uppsala Universitet [Uppsala], Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), RISE Bioscience and Materials/Chemistry and Materials, and RISE Research Institutes of Sweden
Subjects: Biofouling, Pharmaceutical Science, panorama, 01 natural sciences, Analytical Chemistry, Indole Alkaloids, chemistry.chemical_compound, Marine bacteriophage, Ascomycota, Drug Discovery, Ic50 values, Animals, Seawater, 14. Life underwater, UBO, Pharmacology, Oxadiazoles, Natural product, 010405 organic chemistry, Chemistry, ACL, Organic Chemistry, Thoracica, Combinatorial chemistry, 0104 chemical sciences, 010404 medicinal & biomolecular chemistry, Complementary and alternative medicine, Molecular Medicine, Chemical defense, Pharmacophore, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: Stationary and slow-moving marine organisms regularly employ a natural product chemical defense to prevent being colonized by marine micro- and macroorganisms. While these natural antifoulants can be structurally diverse, they often display highly conserved chemistries and physicochemical properties, suggesting a natural marine antifouling pharmacophore. In our current report, we investigate the marine natural product phidianidine A, which displays several chemical properties found in highly potent marine antifoulants. Phidianidine A and synthetic analogues were screened against the settlement and metamorphosis of Amphibalanus improvisus cyprids, and several of the compounds displayed inhibitory activities at low micromolar concentrations with IC50 values down to 0.7 μg/mL observed. The settlement study highlights that phidianidine A is a potent natural antifoulant and that the scaffold can be tuned to generate simpler and improved synthetic analogues. The bioactivity is closely linked to the size of the compound and to its basicity. The study also illustrates that active analogues can be prepared in the absence of the natural constrained 1,2,4-oxadiazole ring. A synthetic lead analogue of phidianidine A was incorporated in a coating and included in antifouling field trials, where it was shown that the coating induced potent inhibition of marine bacteria and microalgae settlement.
Published: 2020
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10. The Antarctic Circumpolar Current as a dispersive agent in the Southern Ocean: evidence from bivalves

Author: Eleonora Puccinelli, Marina Güller, Diego G. Zelaya, Departamento de Biodiversidad y Biología Experimental [Buenos Aires] (DBBE), Facultad de Ciencias Exactas y Naturales [Buenos Aires] (FCEyN), Universidad de Buenos Aires [Buenos Aires] (UBA)-Universidad de Buenos Aires [Buenos Aires] (UBA), Department of Oceanography [Cape Town], University of Cape Town, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, long-distance dispersal, islands, panorama, Gaimardia trapesina, Aquatic Science, Biology, marine biogeography, 010603 evolutionary biology, 01 natural sciences, patterns, 14. Life underwater, species richness, UBO, Ecology, Evolution, Behavior and Systematics, Invertebrate, drake passage, Ecology, macrocystis-pyrifera, ACL, 010604 marine biology & hydrobiology, Hiatella, kelp rafts, Circumpolar star, Marine invertebrates, biology.organism_classification, Current (stream), Taxon, transport, Biological dispersal, west-wind-drift, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: WOS:000569774900003; Over the past decades, several studies have revealed that the traditional view of the Antarctic Circumpolar Current (ACC) as an agent for species dispersal in the Southern Ocean is not applicable to all taxa. Some species are actually circum-Antarctically or circum-sub-Antarctically distributed, but some other species actually comprise species' complexes, with cryptic taxa occurring at different areas. However, to date, few of the invertebrate species formerly reported as widespread in the Southern Ocean have been re-analyzed using genetic techniques. This study examined whether two geographically distant areas of the sub-Antarctic region under the influence of the ACC, the Southern tip of South America (SSA) and the Prince Edward Islands (PEI), share some marine invertebrate species. For that, members of two genera of bivalves, Gaimardia and Hiatella, were selected. As part of this study, we found extremely low genetic differentiation between specimens from SSA and PEI. In addition, shared haplotypes were found between these two areas. Our results confirm that Gaimardia trapesina and one same species of Hiatella ("Hiatella O") are present in both areas. Given that these two species are found on macroalgae, natural rafts appear as the most plausible means of dispersal of juveniles and adults, although in the case of Hiatella O, additional larval dispersion cannot be discarded. In any of these cases, dispersion should be facilitated (or even determined) by the ACC. Thus, this study provides new evidence in favour of considering the ACC as an effective dispersive agent in the Southern Ocean.
Published: 2020
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11. Benefit-risk associated with the consumption of fish bycatch from tropical tuna fisheries

Author: Rona Arrisol, Antoine Bideau, Emmanuel Chassot, François Le Loc'h, Nathalie Bodin, Fany Sardenne, Marisa Antha, Jean-Marie Munaron, Anaïs Médieu, Fabienne Le Grand, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Seychelles Fishing Authority (SFA) (SFA), Université des Seychelles, Institut de Recherche pour le Développement (IRD), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010504 meteorology & atmospheric sciences, Health, Toxicology and Mutagenesis, 010501 environmental sciences, Toxicology, 01 natural sciences, Pelagic fish, Hazard quotient, Western Indian ocean, selenium, Child, trace-elements, Fishes, health, General Medicine, Pollution, Eicosapentaenoic acid, methyl mercury, Docosahexaenoic acid, Child, Preschool, IRD, Adult, Fisheries, chemistry.chemical_element, Biology, Diversity of fish, long-chain, Risk Assessment, Animals, Humans, 14. Life underwater, UBO, 0105 earth and related environmental sciences, ciguatera, Tuna, ACL, toxicity, Pelagic zone, food security, Mercury, Contaminant, essential fatty-acids, Mercury (element), Bycatch, Fishery, chemistry, Seafood, DISCOVERY, mercury concentrations, Sharks, Polyunsaturated fatty acids, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: WOS:000593966600014; International audience; Mercury, omega-3 (docosahexaenoic acid, DHA and eicosapentaenoic acid, EPA) and macronutrients (fat and proteins) were quantified on a wet weight (ww) basis in 20 species of fish taken as bycatch in tropical tuna fisheries. Based on a hazard quotient taking into account mercury and omega-3 contents, a benefit-risk assessment for the consumption of these pelagic species was conducted for three people categories: young children, children and adults. All fish bycatch were found to be an excellent source of proteins (min -max = 14.4-25.2 g/100 g fillet), had low omega-6/omega-3 ratios (\textless1, except for silky shark), and had mercury content below the safety limits defined by sanitary agencies. Silky shark and Istiophoridae had the highest mercury contents (min -max = 0.029-0.317 ppm ww). Omega-3 contents were the lowest in silky shark (0.2 0.2 mg/100 g fillet) and the highest in striped marlin (3.6 +/- 3.2 g/ 100 g fillet). Billfishes (Istiophoridae, including striped marlin), minor tunas (Scombridae), and Carangidae had the highest omega-3 contents (min -max = 0.68-7.28 g/100 g fillet). The highest hazard quotient values obtained for silky shark and great barracuda reflected a lower nutritional benefit (i.e., low omega-3 source) than risk (i.e., mercury exposure), making them not advisable for consumption. Eight species had low hazard quotients, and among them cottonmouth jack and flat needlefish were found of high health interest (high protein, moderate fat contents, and low omega-6/omega-3 ratio). A daily serving portion of 85-200 g (according to people category) can be recommended for these species. Batfish, and to a lower extent pompano dolphinfish and brassy chub, can also be consumed safely and would provide greater health benefits than risks. These results advocate for a better access of these species to local populations. (C) 2020 Elsevier Ltd. All rights reserved.
Published: 2020
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12. Short-term effects of increased CO2, nitrate and temperature on photosynthetic activity in Ulva rigida (Chlorophyta) estimated by different pulse amplitude modulated fluorometers and oxygen evolution

Author: Rafael M. Conde-Álvarez, Erik-J Malta, Solène Connan, Francisco Arenas, José Bonomi-Barufi, Maria H. Abreu, Dagmar B. Stengel, Udo Nitschke, Fungyi Chow, Paula S.M. Celis-Plá, Félix L. Figueroa, O. Meyerhoff, Daniel Robledo, María Teresa Mata, Universidad de Málaga [Málaga] = University of Málaga [Málaga], Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis] (UFSC), Universidad de Playa Ancha, Martin Ryan Institute, National University of Ireland [Galway] (NUI Galway), Interdisciplinary Centre of Marine and Environmental Research [Matosinhos, Portugal] (CIIMAR), Universidade do Porto, Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), I.F.A.P.A. Centro 'Agua del Pino', Consejería de Agricultura y Pesca, University of São Paulo (USP), Universidad de Antofagasta, and CIVESTAV-IPN
Subjects: 0106 biological sciences, Chlorophyll, Photoinhibition, Physiology, Analytical chemistry, Quantum yield, Plant Science, Chlorophyta, Photosynthetic efficiency, Photosynthesis, 010603 evolutionary biology, 01 natural sciences, photosystem I and II, Acidification, chemistry.chemical_compound, Ulva, Nitrate, nitrate, UBO, Photosystem, Nitrates, biology, Chemistry, electron transport rates, 010604 marine biology & hydrobiology, ACL, Oxygen evolution, Temperature, temperature, Carbon Dioxide, biology.organism_classification, Oxygen, climate change, in vivo chlorophyll a fluorescence, 13. Climate action, DISCOVERY, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, CHLOROPHYTA
Abstract: Short-term effects of pCO2 (700–380 ppm; High carbon (HC) and Low carbon (LC), respectively) and nitrate content (50–5 µM; High nitrogen (HN) and Low nitrogen (LN), respectively on photosynthesis were investigated in Ulva rigida (Chlorophyta) under solar radiation (in-situ) and in the laboratory under artificial light (ex-situ). After six days of incubation at ambient temperature (AT), algae were subjected to a 4 °C temperature increase (AT+4 °C) for 3 d. Both in-situ and ex-situ maximal electron transport rate (ETRmax) and in situ gross photosynthesis (GP), measured by O2 evolution, presented highest values under HCHN, and lowest under HCLN, across all measuring systems. Maximal quantum yield (Fv/Fm), and ETRmax of photosystem (PS) II [ETR(II)max] and PSI [ETR(I)max], decreased under HCLN at AT+4 °C. Ex situ ETR was higher than in situ ETR. At noon, Fv/Fm decreased (indicating photoinhibition), whereas ETR(II)max and maximal non-photochemical quenching (NPQmax) increased. ETR(II)max decreased under AT+ 4 °C in contrast to Fv/Fm, photosynthetic efficiency (α ETR) and saturated irradiance (EK). Thus, U. rigida exhibited a decrease in photosynthesis under acidification, changing LN, and AT+4 °C. These results emphasize the importance of studying the interaction between environmental parameters using in-situ versus ex-situ conditions, when aiming to evaluate the impact of global change on marine macroalgae.
Published: 2020
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13. Active phlorotannins from seven brown seaweeds commercially harvested in Brittany (France) detected by(1)H NMR and in vitro assays: temporal variation and potential valorization in cosmetic applications

Author: Stéphane Cérantola, Leslie Gager, Jean-François Arbona, Solène Connan, Magali Molla, Céline Couteau, Laurence Coiffard, Valérie Stiger-Pouvreau, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Mer, molécules et santé EA 2160 (MMS), Université de Nantes - UFR des Sciences Pharmaceutiques et Biologiques, Université de Nantes (UN)-Université de Nantes (UN)-Le Mans Université (UM)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN), plateforme technologique RMN-RPE-SM, and Université de Brest (UBO)
Subjects: 0106 biological sciences, antioxidant, Monitoring, Fucus serratus, Alaria esculenta, Brown algae, antioxidant activity, panorama, Plant Science, Aquatic Science, Epigallocatechin gallate, 01 natural sciences, Phlorotannin, 20% Panorama HCERES 2020, ACTI, chemistry.chemical_compound, biological-activities, Himanthalia elongata, Maceration (wine), sargassaceae, 14. Life underwater, Food science, fucus-vesiculosus, UBO, chemistry.chemical_classification, algae, biology, 010604 marine biology & hydrobiology, ACL, Polyphenols, Cosmeceutical, Seasonality, biology.organism_classification, NMR analysis, chemistry, ascophyllum-nodosum, DISCOVERY, total phenolic content, nutrient availability, seasonal-variation, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Fucales, Ascophyllum, Proceedings Paper, 010606 plant biology & botany, b radiation
Abstract: WOS:000569919500022; This study was focused on the phenolic content and associated cosmetic activities of seven brown marine macroalgae:Alaria esculenta,Ascophyllum nodosum,Bifurcaria bifurcata,Fucus serratus,Halidrys siliquosa,Himanthalia elongata, andLaminaria ochroleuca, selected for their abundance in Brittany and their phlorotannin production. Phlorotannins were extracted by maceration followed by a liquid/liquid purification to obtain fractions enriched in phlorotannins. Seasonal and yearly variations in phenolic contents were investigated thanks to the Folin-Ciocalteu assay to find the best harvesting season for each species.H-1 nuclear magnetic resonance (NMR) was used to validate the presence of phenolic compounds and to compare the species in terms of phenolic signals, as they produce different phlorotannin molecules. Activities required for cosmetic applications (i.e., radical scavenging, antioxidant, photoprotective, and anti-aging activities) were assessed by in vitro tests. Fucales, especiallyA. nodosum,F. serratus,H. elongata, andH. siliquosa, showed higher phenolic contents than Laminariales.Temporal variations were apparent for five seaweeds with the highest phenolic content, notably in autumn. The phenolic content was high regardless of the season and antioxidant and photoprotective activities were similar to those of commercial molecules, allowing year-round algal harvesting. The anti-aging activity ofA. nodosumandF. serratusfractions was higher than the active tea flavonol, epigallocatechin gallate. These results are promising for the use of abundant marine macroalgae as a source of natural active ingredients for cosmetic applications.
Published: 2020
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14. Acoustic behaviour of male European lobsters (Homarus gammarus) during agonistic encounters

Author: Julien Bonnel, Laurent Chauvaud, Youenn Jézéquel, Jennifer Coston-Guarini, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Woods Hole Oceanographic Institution (WHOI)
Subjects: 0106 biological sciences, Passive acoustics, Physiology, CNRS, Zoology, Aquatic Science, Biology, dominance, 010603 evolutionary biology, 01 natural sciences, Acoustic communication, Intraspecific competition, sound production, Homarus gammarus, BeBest, Agonistic behaviour, Buzzing sound, Carapace, Molecular Biology, UBO, Dominance, Ecology, Evolution, Behavior and Systematics, mechanisms, american lobster, communication, 010604 marine biology & hydrobiology, ACL, Tank, carapace vibrations, biology.organism_classification, sensitivity, urine, Accelerometer, Dominance (ethology), Sound attenuation, Algorithmic complexity, particle motion, Insect Science, DISCOVERY, Animal Science and Zoology, recognition, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Carapace vibration, Acoustic attenuation, High attenuation
Abstract: Previous studies have demonstrated that male European lobsters (Homarus gammarus) use chemical and visual signals as a means of intra-specific communication during agonistic encounters. In this study, we show that they also produce buzzing sounds during these encounters. This result was missed in earlier studies because low frequency buzzing sounds are highly attenuated in tanks, and are thus difficult to detect with hydrophones. To address this issue, we designed a behavioural tank experiment with hydrophones, and accelerometers placed on the lobsters to directly detect their carapace vibrations (i.e. the sources of the buzzing sounds). While we found that both dominant and submissive individuals produced carapace vibrations during every agonistic encounter, very few of the associated buzzing sounds (15 %) were recorded by the hydrophones. This difference is explained by their high attenuations in tanks. We then used the method of algorithmic complexity to analyze the carapace vibration sequences as call-and-response signals between dominant and submissive individuals. Even if some intriguing patterns appeared for closely size-matched pairs (< 5 mm carapace length difference), the results of the analysis did not permit to conclude that the processes underlying these sequences could be differentiated from random ones. Thus, such results prevented any conclusion about acoustic communication at this time. This concurs with both the high attenuation of the buzzing sounds during the experiments and the poor understanding of acoustic perception by lobsters. New approaches that circumvent tank acoustic issues are now required to validate the existence of acoustic communication in lobsters.
Published: 2020
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15. Effect of thermal and nutritional conditions on fatty acid metabolism and oxidative stress response in juvenile European sea bass (Dicentrarchus labrax)

Author: Lauriane Madec, José-Luis Zambonino-Infante, Céline Audet, David Mazurais, Loïck Ducros, Denis Chabot, Clémence Gourtay, Guy Claireaux, Christine Huelvan, Institut des Sciences de la MER de Rimouski (ISMER), Université du Québec à Rimouski (UQAR), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), and Fisheries and Oceans Canada (DFO)
Subjects: 0106 biological sciences, enzyme-activities, panorama, Aquatic Science, Biology, medicine.disease_cause, 010603 evolutionary biology, 01 natural sciences, chemistry.chemical_compound, lipid-peroxidation, cytochrome-c-oxidase, temperature adaptation, antioxidant defenses, medicine, 14. Life underwater, Food science, Sea bass, UBO, Ecology, Evolution, Behavior and Systematics, dietary fish-oil, chemistry.chemical_classification, Ecology, Fatty acid metabolism, 010604 marine biology & hydrobiology, ACL, Fatty acid, Lipid metabolism, Malondialdehyde, biology.organism_classification, chemistry, growth-performance, marine fish, climate-change, Dicentrarchus, lipids (amino acids, peptides, and proteins), oxygen-consumption, sense organs, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Ifremer, Oxidative stress, Polyunsaturated fatty acid
Abstract: WOS:000569774900004; Coastal nursery areas are subjected to a wide range of natural and anthropogenic stressors, including global warming, which indirectly influence trophic food webs. A global rarefaction of n-3 polyunsaturated fatty acids (PUFA) in trophic networks is in progress. The aim of this study was to assess the effect of a reduction in the dietary availability of n-3 PUFA on some molecular and biochemical parameters related to lipid metabolism and oxidative stress response in juvenile European sea bass (Dicentrarchus labrax) raised at two temperatures (15 degrees C and 20 degrees C). Fish were fed for five months with a reference diet (RD; 1.65% n-3 PUFA on a dry matter basis, DM), used as a proxy of trophic networks where n-3 PUFA is plentiful, and a lower n-3 PUFA diet (LD; 0.73% n-3 PUFA DM), designed to mimic a decrease in n-3 PUFA resulting from global changes (the n-3 PUFA levels tested remained above the nutritional minimum required for this species). Results showed that diet did not affect the hepatic expression of some mRNA coding for transcriptional factors involved in regulating the metabolic pathways related to fatty acid bioconversion. Although our molecular analysis was limited to transcript expression, these data suggest the presence of a threshold in the nutritional supply of PUFA above which the activation of these molecular pathways does not occur. However, the expression for most of the transcripts tested was up-regulated at 20 degrees C. Despite the high peroxidation index in fish fed RD, very few modifications of the oxidative stress response were associated with diet. At 20 degrees C, an increase of the enzymatic antioxidant response was observed, but there was no correlation with the peroxidation index or malondialdehyde products.
Published: 2020
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16. Strong constitutive expression divergence among strains but no evidence of differential expression associated with sexual reproduction in Alexandrium minutum

Author: Yasmine Even, Mickael Le Gac, Julie Seveno, Laboratoire d'Ecologie Pélagique (PELAGOS), Dynamiques des Écosystèmes Côtiers (DYNECO), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Unité Dyneco, Laboratoire Pelagos, Dynamiques de l'Environnement Côtier (DYNECO), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Mating type, Mating in fungi, Alexandrium minutum, panorama, Plant Science, 010501 environmental sciences, Aquatic Science, Biology, Cyanobacteria, 01 natural sciences, Homology (biology), chemistry.chemical_compound, Gene expression, medicine, Sexual reproduction, UBO, 0105 earth and related environmental sciences, Genetics, Saxitoxin, Mating, 010604 marine biology & hydrobiology, Reproduction, ACL, Dinoflagellate, dinophyceae, sequence, biology.organism_classification, medicine.anatomical_structure, chemistry, Dinoflagellida, Gamete, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, protein, roles, life-cycles
Abstract: WOS:000599869000004; Sexual reproduction remains poorly characterized in dinoflagellates. This is especially the case at the molecular level. Here crossing experiments were performed among strains of the toxic dinoflagellate Alexandrium minutum belonging to two genetically divergent groups. Gene expression was compared between sexually compatible and incompatible crosses at the time of gamete fusion and resting cyst (similar to zygote) formation. Not a single transcript was identified as differentially expressed between compatible and incompatible crosses at these two crucial time points of the dinoflagellate life cycle. However, several thousands of transcripts displayed constitutive expression differences between strains. This was especially the case between the strains belonging to the genetically divergent groups. A few hundreds of transcripts were also identified as differentially expressed between strains belonging to opposite mating types. Some of these transcripts displayed homology with the SxtA protein, known to be involved in saxitoxin production in cyanobacteria, as well as with proteins potentially involved in mating in fungi.
Published: 2020
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17. Unique combinations of coral host and algal symbiont genotypes reflect intraspecific variation in heat stress responses among colonies of the reef-building coral, Montipora digitata

Author: Javid Kavousi, Takashi Nakamura, John Everett Parkinson, Vianney Denis, Victoria Sharp, James Davis Reimer, University of the Ryukyus [Okinawa], National Taiwan Normal University (NTNU), Pennsylvania State University (Penn State), Penn State System, Japan Science and Technology Agency (JST), and University of South Florida [Tampa] (USF)
Subjects: 0106 biological sciences, Coral, Population, specificity, ocean acidification, panorama, Aquatic Science, 010603 evolutionary biology, 01 natural sciences, Intraspecific competition, Montipora digitata, diversity, natural sciences, 14. Life underwater, education, Reef, UBO, resilience, Ecology, Evolution, Behavior and Systematics, education.field_of_study, Phenotypic plasticity, geography, geography.geographical_feature_category, Ecology, biology, Host (biology), 010604 marine biology & hydrobiology, ACL, fungi, technology, industry, and agriculture, temperature, biochemical phenomena, metabolism, and nutrition, biology.organism_classification, mortality, Holobiont, plasticity, climate-change, bleaching susceptibility, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, growth-rate, geographic locations
Abstract: WOS:000514604600007; High temperatures disrupt coral-algal symbioses in multiple ways, with negative impacts on the physiology of the coral host, the algal symbiont, and the combined holobiont. Most heat stress studies on hard corals have understandably focused on species trends based on the combined observation of multiple individuals to account for phenotypic plasticity among colonies. As the "average coral" continues to decline while sea temperatures rise, the outlier colonies that exhibit neutral or positive responses to heat stress are coming to represent larger proportions of marginal coral populations. These colonies are those most likely to guide the future trajectory of reef ecosystems, but their dynamics are often obscured by aggregate analyses. To directly measure and analyze intraspecific variation in heat stress responses within a natural coral population, we performed aquarium experiments on sixteen colonies of the structurally important branching coral Montipora digitata from Okinawa Island, Japan. We resolved host and symbiont genotypes, exposed replicate coral fragments to ambient or elevated temperature, and monitored stress-driven differences in host calcification, symbiont photochemistry, and colony mortality. Over the 6-month experiment, six colonies appeared to tolerate stress (exhibiting no major physiological changes), seven were sensitive to stress (exhibiting reduced growth), and three expired. Both host and symbiont genotype contributed to this variation. These results demonstrate the degree to which unique M. digitata holobionts may differentially respond to thermal stress in warming oceans and highlight the important role of intraspecific variation in shaping future reef assemblages.
Published: 2020
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18. Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes

Author: Chistaki, Urania, Guenegues, Audrey, Liu, Yan, Blain, Stéphane, Catala, Philippe, Colombet, Jonathan, Debeljak, Pavla, Jardillier, Ludwig, Irion, Solène, Planchon, Frédéric, Sassenhagen, Ingrid, Sime-Ngando, Télesphore, Obernosterer, Ingrid, Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Océanographie Microbienne (LOMIC), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Microorganismes : Génome et Environnement - Clermont Auvergne (LMGE), Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Ecologie Systématique et Evolution (ESE), Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Université Paris-Sud - Paris 11 (UP11), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), Université du Littoral Côte d'Opale (ULCO), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB), Laboratoire Microorganismes : Génome et Environnement (LMGE), Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), We thank B. Queguiner, the PI of the MOBYDICK project, for providing us the opportunity to participate to this cruise, the captain and crew of the R/V Marion Dufresne for their enthusiasm and support aboard during the MOBYDICK-THEMISTO cruise (https://doi.org/10.17600/18000403) and the chief scientist I. Obernosterer. This work was supported by the French oceanographic fleet ('Flotte oceanographique francaise'), the French ANR ('Agence Nationale de la Recherche', AAPG 2017 program, MOBYDICK Project number: ANR-17-CE01-0013), and the French Research program of INSU-CNRS LEFE/CYBER ('Les enveloppes fluides et l'environnement'-'Cycles biogeochimiques, environnement et ressources'). This work was also supported by ULCO (Universite du Littoral) and CPER MARCO (https://marco.univ-littoral.fr/).We thank three anonymous reviewers and the editors for their comments which helped to improve this work., Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO)
Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ekologi, kerguelen area, Ecology, ACL, chibido, marine, phytoplankton bloom, Microbial food web, fluxes, natural iron fertilization, viral-infection, inverse relationship, [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology, carbon export, productivity regimes, export efficiency, community structure, crozet plateau, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Southern Ocean, UBO, ANR-17-CE01-0013, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract: International audience; Spatial and seasonal dynamics of microbial loop fluxes were investigated in contrasting productivity regimes in the Indian sector of the Southern Ocean. Observations carried out in late summer (February-March 2018; project MOBYDICK) revealed higher microbial biomasses and fluxes in the naturally iron-fertilized surface waters of Kerguelen island in comparison to surrounding off-plateau waters. Differences were most pronounced for bacterial heterotrophic production (2.3-fold), the abundance of heterotrophic nanoflagellates (HNF; 2.7-fold). Independent of site, grazing by HNF was the main loss process of bacterial production (80-100%), while virus-induced mortality was low (\textless 9%). Combining these results with observations from previous investigations during early spring and summer allowed us to describe seasonal patterns in microbial food web fluxes and to compare these to carbon export in the iron-fertilized and high-nutrient, low-chlorophyll (HNLC) Southern Ocean. Our data suggest an overall less efficient microbial food web during spring and summer, when respiration and viral lysis, respectively, represent important loss terms of bacterially-mediated carbon. In late summer, primary production is more efficiently transferred to bacterial biomass and HNF and thus available for higher trophic levels. These results provide a new insight into the seasonal variability and the quantitative importance of microbial food web processes for the fate of primary production in the Southern Ocean.
Published: 2020
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19. Temporal variation in pigment and mycosporine-like amino acid composition of the red macroalga Palmaria palmata from Brittany (France): hypothesis on the MAA biosynthesis pathway under high irradiance

Author: Fanny Lalegerie, Solène Connan, Valérie Stiger-Pouvreau, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Pigments, panorama, Plant Science, hplc, Aquatic Science, Synthesis pathway, 01 natural sciences, Nutrient storage, induced dna-damage, Nutrient, kelp macrocystis-pyrifera, Botany, otorhinolaryngologic diseases, liquid-chromatography, Photo-protection, MAAs, photosynthetic pigments, Carotenoid, UBO, chemistry.chemical_classification, biology, 010604 marine biology & hydrobiology, Phycobiliprotein, ACL, gelidium-sesquipedale, Plant physiology, gracilaria-tenuistipitata rhodophyta, solar uv-radiation, ultraviolet-radiation, biology.organism_classification, Salinity, Mycosporine-like amino acid, Palmaria palmata, chemistry, 13. Climate action, Photoprotection, DISCOVERY, Rhodophyta, seasonal-variation, light-intensity, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, 010606 plant biology & botany
Abstract: WOS:000520805600001; Changes in pigment (chlorophyll-a, carotenoids and phycobiliproteins) and mycosporine-like amino acid (MAA) composition were studied in the red edible macroalga Palmaria palmata, harvested between February 2018 and February 2019 at 2 sites from Brittany (France). The results occuring in natural conditions revealed a high seasonal variability that can be related to a combination of environmental parameters, including light, nutrients, temperature, salinity and pH, which may have synergistic or antagonistic effects. A decrease in pigments was observed in summer, matching with the increase in irradiance at the same period. On the contrary, the increase in light from February to May has caused an increase in the total MAA content, confirming the UV-photoprotective role attributed to these compounds. Analysis of the results coupled with the biosynthesis pathway suggests that some MAAs are favoured in the occurrence of high irradiance. In this sense, asterina-330 was synthetized only between March and July and not the rest of the year, supporting its importance in photoprotection. In addition, analysis revealed that nutrient availibility could have a significant influence on MAAs since their synthesis seemed to be limited in summer, despite significant exposure to light. However, this decrease could be due to another potential role of MAAs as a nitrogen source for macroalgae. Thus, the diversity of these compounds and the different synthesis pathways could be explained by different roles including photo-protection and nitrogen source, making MAA multi-purpose protective agents which could play a key role in the adaptation of this species to its changing environment.
Published: 2020
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20. From legacy pollutants to emerging contaminants: recent inputs from the 2018 conference of EcoBIM network

Author: Jérôme Cachot, Michel Auffret, Richard Saint-Louis, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), and Université du Québec à Rimouski (UQAR)
Subjects: Pollutant, Health, Toxicology and Mutagenesis, ACL, panorama, General Medicine, Contamination, Congresses as Topic, Ecotoxicology, Pollution, Environmental protection, Environmental Chemistry, Environmental science, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, UBO, Water Pollutants, Chemical, Environmental Monitoring
Published: 2020
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21. Nanoplastics exposure modulate lipid and pigment compositions in diatoms

Author: Ika Paul-Pont, Arnaud Huvet, Fabienne Le Grand, Philippe Soudant, Carmen González-Fernández, Antoine Bideau, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Murcia, Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
Subjects: Pigments, Aquatic Organisms, microplastics, 010504 meteorology & atmospheric sciences, CNRS, Health, Toxicology and Mutagenesis, Membrane lipids, panorama, 010501 environmental sciences, Toxicology, 01 natural sciences, Thylakoids, phaeodactylum-tricornutum, Pigment, Algae, membrane, UBO, 0105 earth and related environmental sciences, particles, Diatoms, biology, Chemistry, ACL, microalgae, polystyrene nanoparticles, Lipid composition, marine, toxicity, Galactolipids, plastic nanoparticles, General Medicine, fatty-acids, biology.organism_classification, Pollution, Lipids, Diatom, Biochemistry, 13. Climate action, Photoprotection, visual_art, Thylakoid, visual_art.visual_art_medium, Polystyrenes, Composition (visual arts), Nanoplastics, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Ifremer
Abstract: WOS:000533524300107; The impact of nanoplastics (NP) using model polystyrene nanoparticles amine functionalized (PS-NH2) has been investigated on pigment and lipid compositions of the marine diatom Chaetoceros neogracile, at two growth phases using a low (0.05 mu g mL(-1)) and a high (5 mu g mL(-1)) concentrations for 96 h. Results evidenced an impact on pigment composition associated to the light-harvesting function and photo-protection mainly at exponential phase. NP also impacted lipid composition of diatoms with a readjustment of lipid classes and fatty acids noteworthy. Main changes upon NP exposure were observed in galactolipids and triacylglycerol's at both growth phases affecting the thylakoids membrane structure and cellular energy reserve of diatoms. Particularly, exponential cultures exposed to high NP concentration showed an impairment of long chain fatty acids synthesis. Changes in pigment and lipid content of diatom' cells revealed that algae physiology is determinant in the way cells adjust their thylakoid membrane composition to cope with NP contamination stress. Compositions of reserve and membrane lipids are proposed as sensitive markers to assess the impact of NP exposure, including at potential predicted environmental doses, on marine organisms. (C) 2020 Elsevier Ltd. All rights reserved.
Published: 2019
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22. Sources, quality and transfers of organic matter in a highly-stratified sub-Arctic coastal system (Saint-Pierre-et-Miquelon, NW Atlantic)

Author: Tarik Meziane, Sebastien Donnet, Laurent Chauvaud, Jacques Grall, Guillaume Bridier, Pascal Lazure, Frédéric Olivier, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Fisheries and Oceans Canada (DFO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN), Station de Biologie Marine de Concarneau, Direction générale déléguée à la Recherche, à l’Expertise, à la Valorisation et à l’Enseignement-Formation (DGD.REVE), Muséum national d'Histoire naturelle (MNHN)-Muséum national d'Histoire naturelle (MNHN), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), and Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0106 biological sciences, Subarctic ecosystems, 010504 meteorology & atmospheric sciences, CNRS, Stratification (water), Seasonal stratification, Aquatic Science, 01 natural sciences, temporal variation, continental-shelf, BeBest, Phytoplankton, Sedimentary organic matter, fatty-acid-composition, Organic matter, Marine ecosystem, 14. Life underwater, Fatty acids, UBO, Newfoundland shelf, Stable isotopes, 0105 earth and related environmental sciences, Total suspended solids, chemistry.chemical_classification, trophic markers, ACL, zooplankton fecal pellets, 010604 marine biology & hydrobiology, Pelagic-benthic coupling, Geology, stable-isotopes, Spring bloom, Saint-Pierre et Miquelon archipelago, spring bloom, sand dollar, Oceanography, chemistry, 13. Climate action, Benthic zone, DISCOVERY, Environmental science, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, cell-size, settling matter
Abstract: WOS:000604182000002; In response to ongoing global climate change, marine ecosystems in the northwest Atlantic are experiencing one of the most drastic increases in sea surface temperatures in the world. This warming can increase water column stratification and decrease surface nutrient concentrations, in turn impacting primary productivity and phytoplankton assemblages. However, the exact impacts of these changes on sources and quality of organic matter as well as its transfers to the benthic compartment remain uncertain. This survey characterized organic matter sources and quality within a highly-stratified sub-Arctic coastal system (Saint-Pierre and Miquelon) and described its transfer towards a biomass-dominant primary consumer, the sand dollar Echinarachnius parma. This study analyzed fatty acid and stable isotope (delta C-13 and delta N-15) composition of surface and bottom Particulate Organic Matter (s-POM and b-POM, respectively), Sedimentary Organic Matter (SOM) and sand dollar tissue along a near shore to offshore gradient during two contrasting seasons associated either with sharp or weak water column stratification (i.e. High vs Low Stratification Periods). Results revealed high relative abundances of polyunsaturated fatty acids (notably macro- and microalgae markers) in POM during the Low Stratification Period while the High Stratification Period was characterized by elevated relative abundance of saturated fatty acids indicating a higher organic matter degradation state. In addition, strong seasonal differences were also observed in food availability with four-fold higher concentrations in total suspended solids during Low vs High Stratification Periods. These results suggested thus multiple negative effects of stratification on pelagic-benthic coupling and POM quality. Lower nutrient repletion of surface waters during period of sharp stratification diminishes pelagic-benthic coupling by reducing food availability, POM quality and vertical transfer of organic matter. By contrast, the sediment-based diet of E. parma showed a low spatiotemporal variability reflecting the homogenous composition of the SOM. This study suggests that intensified water column stratification due to increasing sea surface temperatures may modify the pelagic-benthic coupling and future quality and composition of POM pools.
Published: 2021
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23. Stable mercury concentrations of tropical tuna in the south western Pacific ocean: An 18-year monitoring study

Author: Olivier Gauthier, Aurore Receveur, Christopher J. Somes, Christophe E. Menkès, Anaïs Médieu, David Point, David P. Gillikin, Jeremy Collin, Valerie Allain, Anne Lorrain, Heidi Pethybridge, Andrew T. Revill, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Pacific community (SPC), CSIRO Marine and Atmosphere Research [Hobart], Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), Ecologie marine tropicale des océans Pacifique et Indien (ENTROPIE [Nouvelle-Calédonie]), Ifremer - Nouvelle-Calédonie, Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Université de la Nouvelle-Calédonie (UNC), Union College, Helmholtz Centre for Ocean Research [Kiel] (GEOMAR), Funding was provided by the Pacific Fund VACOPA project and ANR-17-CE34-0010 MERTOX from the French Agence Nationale de la Recherche. The U.S. National Science Foundation funded Union College’s isotope ratio mass spectrometer and peripherals (NSF-MRI #1229258)., ANR-17-CE34-0010,MERTOX,Découvrir l'origine de la toxine methylmercure dans les écosystèmes marins(2017), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Ifremer - Nouvelle-Calédonie, and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Nouvelle-Calédonie (UNC)
Subjects: Skipjack tuna, Health, Toxicology and Mutagenesis, Biomagnification, 0208 environmental biotechnology, Bigeye tuna, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Yellowfin tuna, chemistry.chemical_compound, subtropical gyre, SUD, Methylmercury, Trophic level, fixation, biology, New Caledonia-Fiji region, General Medicine, Pollution, nitrogen deposition, bioaccumulation, in-situ, Environmental chemistry, IRD, Environmental Monitoring, Food Chain, Environmental Engineering, Oceans and Seas, Stable isotope data, trophic position, thunnus-albacares, Phytoplankton, Animals, Environmental Chemistry, 14. Life underwater, UBO, 0105 earth and related environmental sciences, Pacific Ocean, Tuna, ACL, yellowfin tuna, Public Health, Environmental and Occupational Health, atmospheric mercury, risk-assessment, Mercury, General Chemistry, biology.organism_classification, 020801 environmental engineering, chemistry, 13. Climate action, Environmental science, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Water Pollutants, Chemical
Abstract: WOS:000595802200153; International audience; Global anthropogenic mercury (Hg) emissions to the atmosphere since industrialization are widely considered to be responsible for a significant increase in surface ocean Hg concentrations. Still unclear is how those inputs are converted into toxic methylmercury (MeHg) then transferred and biomagnified in oceanic food webs. We used a unique long-term and continuous dataset to explore the temporal Hg trend and variability of three tropical tuna species (yellowfin, bigeye, and skipjack) from the southwestern Pacific Ocean between 2001 and 2018 (n - 590). Temporal trends of muscle nitrogen (delta N-15) and carbon (delta C-13) stable isotope ratios, amino acid (AA) delta N-15 values and oceanographic variables were also investigated to examine the potential influence of trophic, biogeochemical and physical processes on the temporal variability of tuna Hg concentrations. For the three species, we detected significant inter-annual variability but no significant long-term trend for Hg concentrations. Inter-annual variability was related to the variability in tuna sampled lengths among years and to tuna muscle delta N-15 and delta C-13 values. Complementary AA- and model-estimated phytoplankton delta N-15 values suggested the influence of baseline processes with enhanced tuna Hg concentrations observed when dinitrogen fixers prevail, possibly fuelling baseline Hg methylation and/or MeHg bioavailability at the base of the food web. Our results show that MeHg trends in top predators do not necessary capture the increasing Hg concentrations in surface waters suspected at the global oceanic scale due to the complex and variable processes governing Hg deposition, methylation, bioavailability and biomagnification. This illustrates the need for long-term standardized monitoring programs of marine biota worldwide. (C) 2020 Elsevier Ltd. All rights reserved.
Published: 2021
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24. Determination of rare earth elements in gadolinium-based contrast agents by ICP-MS

Author: Douraied Ben Salem, Jean-Alix Barrat, CCSD, Accord Elsevier, Laboratoires d'excellence - LabexMER Marine Excellence Research: a changing ocean - - LabexMER2010 - ANR-10-LABX-0019 - LABX - OLD, Laboratoire de Traitement de l'Information Medicale (LaTIM), Université de Brest (UBO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre Hospitalier Régional Universitaire de Brest (CHRU Brest)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010), Institut National de la Santé et de la Recherche Médicale (INSERM)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre Hospitalier Régional Universitaire de Brest (CHRU Brest)-Université de Brest (UBO)-Institut Brestois Santé Agro Matière (IBSAM), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: chibido, Gadolinium, Rare earth, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Analytical Chemistry, BeBest, ICP-MS, samples, Magnetic resonance imaging (MRI), UBO, Rare earth elements, Inductively coupled plasma mass spectrometry, Trace elements, ACL, 010401 analytical chemistry, Trace element, icp-ms, 021001 nanoscience & nanotechnology, 0104 chemical sciences, 3. Good health, Gadolinium based contrast agent (GBCA), [SDE.BE] Environmental Sciences/Biodiversity and Ecology, chemistry, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, 0210 nano-technology, ANR-10-LABX-19
Abstract: WOS:000579910600080; International audience; A simple ICP-MS procedure for the determination of trace element concentrations in GBCAs is described here. Abundances of most of the REEs, Y, Ba and Pb concentrations were determined. We confirm that GBCAs contain traces of non-Gd REEs, Y, Ba and Pb. REE patterns of the five GBCAs actually administered in France have been obtained. They display specific shapes that make it possible to identify the different Gd oxides oxides used by pharmaceutical laboratories to produce them. Our method enables us to quickly evaluate the quantities of impurities in these products and, if necessary, to follow the evolution of their quality in the future. The presence of small but not negligible quantities of Y and REEs other than Gd cannot be ignored in these products, and their behaviour in the human body must be considered. The concentrations measured for Pb and Ba, on the other hand, are much lower and do not pose any particular problems.
Published: 2021
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25. Impact of fishing gears and fishing intensities on maerl beds: An experimental approach

Author: Julien Dubreuil, Benjamin Guyonnet, Jacques Grall, Adeline Tauran, Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Inconnu, TBM environnement, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: ecosystem, 0106 biological sciences, ACL, 010604 marine biology & hydrobiology, Fishing, Aquatic Science, Biology, 010603 evolutionary biology, 01 natural sciences, Fishery, shelf, bay, DISCOVERY, habitats, 14. Life underwater, Maerl, community structure, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, rhodoliths, UBO, trawl disturbance, Ecology, Evolution, Behavior and Systematics
Abstract: WOS:000588286500005
Published: 2020
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26. Légalité de la plus grande réserve naturelle française

Author: Nicolas Boillet, Aménagement des Usages des Ressources et des Espaces marins et littoraux - Centre de droit et d'économie de la mer (AMURE), Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), and Julien, Séverine
Subjects: [SHS.DROIT]Humanities and Social Sciences/Law, [SHS.DROIT] Humanities and Social Sciences/Law, ACL, droit, ubo
Published: 2019

27. Links between size fractionation, chemical speciation of dissolved copper and chemical speciation of dissolved organic matter in the Loire estuary

Author: Ricardo Riso, Matthieu Waeles, Johann Breitenstein, Gabriel Dulaquais, Joël Knoery, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer - Atlantique (IFREMER Atlantique), and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
Subjects: 010504 meteorology & atmospheric sciences, chibido, Fluorescence spectrometry, chemistry.chemical_element, Bioconcentration, 010501 environmental sciences, 01 natural sciences, Geochemistry and Petrology, Dissolved organic carbon, Environmental Chemistry, UBO, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, ACL, Soil chemistry, Estuary, Copper, 6. Clean water, Chemical oceanography, chemistry, 13. Climate action, Chemistry (miscellaneous), Environmental chemistry, Seawater, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract: Environmental contextThe toxicity of copper to aquatic life is highly dependent on its chemical form. In the vineyards of the Loire valley, mixtures of copper compounds are increasingly being used as fungicides. Our study investigating the origin and behaviour of dissolved copper on the land-sea continuum of the Loire advances our understanding of the chemical forms and fate of copper in estuarine systems. AbstractWe present data on the organic speciation of dissolved copper (dCu) in the Loire estuary for the soluble (
Published: 2020
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28. Parallel evolution of local adaptation and reproductive isolation in the face of gene flow

Author: Butlin, RK, Saura, M, Charrier, G, Jackson, B, André, C, Caballero, A, Coyne, JA, Galindo, J, Grahame, JW, Hollander, J, Kemppainen, P, Martínez-Fernández, M, Panova, M, Quesada, H, Johannesson, K, Rolán-Alvarez, E, University of Gothenburg (GU), Department of Animal and Plant Sciences [Sheffield], University of Sheffield [Sheffield], Universidade de Vigo, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Ecology and Evolution [Chicago], University of Chicago, University of Leeds, Lund University [Lund], Faculty of Life Sciences [Manchester], University of Manchester [Manchester], University of California [Irvine] (UCI), and University of California
Subjects: E1, parallel evolution, speciation, ACL, WOS, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, UBO, local adaptation, Gene flow
Abstract: Parallel evolution of similar phenotypes provides strong evidence for the operation of natural selection. Where these phenotypes contribute to reproductive isolation, they further support a role for divergent, habitat-associated selection in speciation. However, the observation of pairs of divergent ecotypes currently occupying contrasting habitats in distinct geographical regions is not sufficient to infer parallel origins. Here we show striking parallel phenotypic divergence between populations of the rocky-shore gastropod, Littorina saxatilis, occupying contrasting habitats exposed to either wave action or crab predation. This divergence is associated with barriers to gene exchange but, nevertheless, genetic variation is more strongly structured by geography than by ecotype. Using approximate Bayesian analysis of sequence data and amplified fragment length polymorphism markers, we show that the ecotypes are likely to have arisen in the face of continuous gene flow and that the demographic separation of ecotypes has occurred in parallel at both regional and local scales. Parameter estimates suggest a long delay between colonization of a locality and ecotype formation, perhaps because the postglacial spread of crab populations was slower than the spread of snails. Adaptive differentiation may not be fully genetically independent despite being demographically parallel. These results provide new insight into a major model of ecologically driven speciation. © 2013 The Authors. Evolution published by Wiley Periodicals, Inc.
Published: 2014
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28 results on '"UBO"'

1. Mass-independent and mass-dependent Cr isotopic composition of the Rumuruti (R) chondrites: Implications for their origin and planet formation

2. Ultra‐diluted bioactive compounds enhance energy storage and oocyte quality during gonad conditioning of Pacific calico scallop Argopecten ventricosus (Sowerby II, 1842)

3. A 45-year sub-annual reconstruction of seawater temperature in the Bay of Brest, France, using the shell oxygen isotope composition of the bivalve Glycymeris glycymeris

4. Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage: insights from mercury stable isotopes

5. Amino-nanopolystyrene exposures of oyster (Crassostrea gigas) embryos induced no apparent intergenerational effects

6. The silent spring of Sargassum

7. Extending community trajectory analysis: New metrics and representation

8. A New Protocol Using Acidification for Preserving DMSP in Macroalgae and Comparison with Existing Protocols

9. Phidianidine A and Synthetic Analogues as Naturally Inspired Marine Antifoulants

10. The Antarctic Circumpolar Current as a dispersive agent in the Southern Ocean: evidence from bivalves

11. Benefit-risk associated with the consumption of fish bycatch from tropical tuna fisheries

12. Short-term effects of increased CO2, nitrate and temperature on photosynthetic activity in Ulva rigida (Chlorophyta) estimated by different pulse amplitude modulated fluorometers and oxygen evolution

13. Active phlorotannins from seven brown seaweeds commercially harvested in Brittany (France) detected by(1)H NMR and in vitro assays: temporal variation and potential valorization in cosmetic applications

14. Acoustic behaviour of male European lobsters (Homarus gammarus) during agonistic encounters

15. Effect of thermal and nutritional conditions on fatty acid metabolism and oxidative stress response in juvenile European sea bass (Dicentrarchus labrax)

16. Strong constitutive expression divergence among strains but no evidence of differential expression associated with sexual reproduction in Alexandrium minutum

17. Unique combinations of coral host and algal symbiont genotypes reflect intraspecific variation in heat stress responses among colonies of the reef-building coral, Montipora digitata

18. Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes

19. Temporal variation in pigment and mycosporine-like amino acid composition of the red macroalga Palmaria palmata from Brittany (France): hypothesis on the MAA biosynthesis pathway under high irradiance

20. From legacy pollutants to emerging contaminants: recent inputs from the 2018 conference of EcoBIM network

21. Nanoplastics exposure modulate lipid and pigment compositions in diatoms

22. Sources, quality and transfers of organic matter in a highly-stratified sub-Arctic coastal system (Saint-Pierre-et-Miquelon, NW Atlantic)

23. Stable mercury concentrations of tropical tuna in the south western Pacific ocean: An 18-year monitoring study

24. Determination of rare earth elements in gadolinium-based contrast agents by ICP-MS

25. Impact of fishing gears and fishing intensities on maerl beds: An experimental approach

26. Légalité de la plus grande réserve naturelle française

27. Links between size fractionation, chemical speciation of dissolved copper and chemical speciation of dissolved organic matter in the Loire estuary

28. Parallel evolution of local adaptation and reproductive isolation in the face of gene flow

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28 results on '"UBO"'

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