Consulta: creatorFacets:"Gremare, Antoine"
Registros recuperados: 14
Data/hora: 01/06/2024 09:22:29

Impact of organic matter source and quality on living benthic foraminiferal distribution on a river-dominated continental margin: A study of the Portuguese margin
Provedor de dados: 5
Autores: Dessandier, Pierre-antoine; Bonnin, Jerome; Kim, Jung-hyun; Bichon, Sabrina; Deflandre, Bruno; Gremare, Antoine; Damste, Jaap S. Sinninghe.
Living (rose Bengal stained) benthic foraminifera were investigated on surface sediments from 23 stations from the river-dominated northwestern Portuguese margin. Samples were collected in March 2011, following the period of the maximum rainfall over the Iberian Peninsula, between 20 and 2000m water depth along five cross-margin transects. Four of them are located off the Douro, Mondego, Tagus, and Sado Rivers and one off the Estremadura coast. The major objectives of this study are (1) to assess the impact of organic matter of various origin and quality on the benthic foraminifera and (2) to investigate the spatial differences of faunal distribution from coastal waters to the deep sea under river influences. To do this, sedimentological and biogeochemical...
Tipo: Text
Palavras-chave: Benthic foraminiferal ecology; Fluvial influence; Organic matter quality; Portuguese margin.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00667/77896/80083.pdf

Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database
Provedor de dados: 5
Autores: Gallon, Regis K.; Lavesque, Nicolas; Grall, Jacques; Labrune, Celine; Gremare, Antoine; Bachelet, Guy; Blanchet, Hugues; Bonifacio, Paulo; Bouchet, Vincent M. P.; Dauvin, Jean-claude; Desroy, Nicolas; Gentil, Franck; Guerin, Laurent; Houbin, Celine; Jourde, Jerome; Laurand, Sandrine; Le Duff, Michel; Le Garrec, Vincent; De Montaudouin, Xavier; Olivier, Frederic; Orvain, Francis; Sauriau, Pierre-guy; Thiebaut, Eric; Gauthier, Olivier.
This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) seaboards: English Channel, Bay of Biscay and Mediterranean Sea and 2) 0.5° latitudinal and longitudinal grid. Total observed richness, rarefaction curves and three incidence-based richness estimators (Chao2, ICE and Jacknife1) were used to compare soft bottom habitats species richness in each seaboard. Overall, the Mediterranean Sea has the highest richness and despite higher sampling effort, the English Channel...
Tipo: Text
Palavras-chave: Zoobenthos; Species richness; Regional pattern; Latitudinal pattern; Soft-bottom; France.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00376/48769/49166.pdf

Declining maerl vitality and habitat complexity across a dredging gradient: Insights from in situ sediment profile imagery (SPI)
Provedor de dados: 5
Autores: Bernard, Guillaume; Romero-ramirez, Alicia; Tauran, Adeline; Pantalos, Michael; Deflandre, Bruno; Grall, Jacques; Gremare, Antoine.
Maerl beds form complex biogenic benthic habitats, characterized by high productivity as well as diverse biological communities. Disturbances associated with extraction and/or fishing activities using mobile bottom-contacting gears such as clam-dredges induce the most severe and long-term effects on these fragile habitats. We here investigated the effects of dredge-fishing on maerl in the bay of Brest (France). We quantified maerl beds structure and vitality across a fine scale quantified dredging intensity gradient through the acquisition of in-situ images of beds cross-section using Sediment Profile Imaging system (SPI). Declines in the proxies of maerl vitality and habitat complexity were measured across the gradient, and were associated with...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00677/78861/81162.pdf

Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries
Provedor de dados: 5
Autores: Blanchet, Hugues; Gouillieux, Benoit; Alizier, Sandrine; Amouroux, Jean-michel; Bachelet, Guy; Barille, Anne-laure; Dauvin, Jean-claude; De Montaudouin, Xavier; Derolez, Valerie; Desroy, Nicolas; Grall, Jacques; Gremare, Antoine; Hacquebart, Pascal; Jourde, Jerome; Labrune, Celine; Lavesque, Nicolas; Meirland, Alain; Nebout, Thiebaut; Olivier, Frederic; Pelaprat, Corine; Ruellet, Thierry; Sauriau, Pierre-guy; Thorin, Sebastien.
Based on a parallel sampling conducted during autumn 2008, a comparative study of the intertidal benthic macrofauna among 10 estuarine systems located along the Channel and Atlantic coasts of France was performed in order to assess the level of fauna similarity among these sites and to identify possible environmental factors involved in the observed pattern at both large (among sites) and smaller (benthic assemblages) scales. More precisely this study focused on unraveling the observed pattern of intertidal benthic fauna composition and diversity observed at among-sites scale by exploring both biotic and abiotic factors acting at the among- and within-site scales. Results showed limited level of similarity at the among-site level in terms of intertidal...
Tipo: Text
Palavras-chave: Estuaries; Macrozoobenthos; Diversity; Structuring Factors; WFD.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00179/29016/27444.pdf

Experimental study of filtration activity in Ditrupa arietina (Annelida Polychaeta) using an automated image analysis system
Provedor de dados: 5
Autores: Duchene, Jean Claude; Jordana, Esther; Charles, François; Gremare, Antoine; Amouroux, Jean Michel.
An automated image analysis system designed to assess the activity of benthic organisms is described. This system is used to study filtration in the serpulid polychaete Ditrupa arietina. The video sensor of the system is composed of a black and white charged coupled device, a microprocessor, a memory and an interface board. It is driven by real-time routines, which are downloaded in permanent memory prior to each experiment. These routines control picture acquisition frequency and compute the differences in grey levels between the image recorded at a given time and a reference image (corresponding to no filtration in the case of D. arietina). These differences are used to detect numerical objects, which are stored in the memory board. At the end of each...
Tipo: Text
Palavras-chave: Polychètes; Analyse d'images; Activité; Filtration; Polychaetes; Image analysis; Activity; Filtration.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43377/42834.pdf

Etude des relations entre le phytoplancton et les phénomènes de toxicité d’origine inconnue dans le Bassin d'Arcachon
Provedor de dados: 5
Autores: Maurer, Daniele; Bec, Beatrice; Neaud-masson, Nadine; Rumebe, Myriam; Auby, Isabelle; Gremare, Antoine.
Since the introduction of the oyster Crassostrea gigas in the Arcachon Basin, the sale of oysters has been banned for the first time in 2005, based on mouse bioassay positive for lipophilic toxins. If the beginning of this episode could be related to the presence in water of microalgae of the genus Dinophysis and okadaic acid in the hepatopancreas of oyster, it has not been the same for the end of the period, which was qualified as of "atypical toxicity episode" or "toxicity of unknown origin", that is to say, "an episode of shellfish contamination, revealed in a toxic response in mice by intraperitoneal injection , whose origin can not be explained by the presence of known toxins usually sought”. Between 1993 and 2009, 7 episodes Dinophysis or okadaic...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00031/14245/11526.pdf

Experimental Assessment of the Effects of Temperature and Food Availability on Particle Mixing by the Bivalve Abra alba Using New Image Analysis Techniques
Provedor de dados: 5
Autores: Bernard, Guillaume; Duchene, Jean-claude; Romero-ramirez, Alicia; Lecroart, Pascal; Maire, Olivier; Ciutat, Aurelie; Deflandre, Bruno; Gremare, Antoine.
The effects of temperature and food addition on particle mixing in the deposit-feeding bivalve Abra alba were assessed using an experimental approach allowing for the tracking of individual fluorescent particle (luminophore) displacements. This allowed for the computations of vertical profiles of a set of parameters describing particle mixing. The frequency of luminophore displacements (jumps) was assessed through the measurement of both waiting times (i.e., the time lapses between two consecutive jumps of the same luminophore) and normalized numbers of jumps (i.e., the numbers of jumps detected in a given area divided by the number of luminophores in this area). Jump characteristics included the direction, duration and length of each jump. Particle...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00375/48615/49432.pdf

Is benthic food web structure related to diversity of marine macrobenthic communities?
Provedor de dados: 5
Autores: Sokolowski, Adam; Wolowicz, M.; Asmus, H.; Asmus, R.; Carlier, Antoine; Gasiunaite, Z.; Gremare, Antoine; Hummel, H.; Lesutiene, J.; Razinkovas, A.; Renaud, Paul; Richard, P.; Kedra, M.
Numerical structure and the organisation of food webs within macrozoobenthic communities has been assessed in the European waters (Svalbard, Barents Sea, Baltic Sea, North Sea, Atlantic Ocean and the Mediterranean Sea) to address the interactions between biodiversity and ecosystem functioning. Abundance and classical species diversity indices (S, H', J) of macrofaunal communities were related to principal attributes of food webs (relative trophic level and food chain length, FCL) that were determined from carbon and nitrogen stable isotope values. Structure of marine macrobenthos varies substantially at a geographical scale; total abundance ranges from 63 ind. m(-2) to 34,517 ind. m(-2), species richness varies from 3 to 166 and the Shannon-Weaver...
Tipo: Text
Palavras-chave: Macrobenthic communities; Biodiversity; Food web structure; Diversity-structure interactions; European waters.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00093/20378/18214.pdf

Report on the science strategy required to answer the targeted scientific questions, policy requirements, and societal challenges within JERICO-NEXT
Provedor de dados: 5
Autores: Gremare, Antoine; Durand, Dominique; Delauney, Laurent; Seppala, Jukka; Creach, Veronique; Farcy, Patrick.
This document reports on the science strategy required to answer the targeted scientific questions, policy requirements, and societal challenges linked with the observation of the European Coastal Ocean as elaborated within the framework of the WP 1 of the JERICO-NEXT project. The structuration of JERICO-RI science strategy is in line with the scientific strategies put forward by current major international initiatives regarding the observation of the ocean (i.e., GOOS, EOOS and EUROGOOS). The main elements of those general strategies are: (1) technological innovation, (2) the enhancement of integration/coordination, (3) the developments of interactions between observation initiatives acting over different spatiotemporal scales, (4) the optimisation of the...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00627/73933/73283.pdf

Benthic foraminifera from the deep-water Niger delta (gulf of Guinea): Assessing present-day and past activity of hydrate pockmarks
Provedor de dados: 5
Autores: Fontanier, Christophe; Koho, K. A.; Goni-urriza, M. S.; Deflandre, Bruno; Galaup, S.; Ivanovsky, A.; Gayet, Nicolas; Dennielou, Bernard; Gremare, Antoine; Bichon, S.; Gassie, C.; Anschutz, P.; Duran, R.; Reichart, G. J.
We present ecological and isotopic (δ18O and δ13C) data on benthic foraminifera sampled from 4 deep-sea stations in a pockmark field from the deep-water Niger delta (Gulf of Guinea, Equatorial Atlantic Ocean). In addition, a series of sedimentological and (bio)geochemical data are shown to back up foraminiferal observations. All stations are located within 1.2 km of each other, so prevailing oceanographic conditions can be assumed to be similar at each site. Two of the sites (GMMC-01 and GMMC-02) are located in a pockmark (named “pockmark A”) where current methane seepages were recorded by ROV observations. A third station (GMMC-03) is located in the topographic depression interpreted as a collapsed pockmark (named “pockmark B”). The fourth site (GMMC-04)...
Tipo: Text
Palavras-chave: Niger delta; Hydrate pockmark; Foraminifera; Stable isotopes; Bacteria.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32194/30628.pdf

Are deep-sea ecosystems surrounding Madagascar threatened by land-use or climate change?
Provedor de dados: 5
Autores: Fontanier, Christophe; Mamo, Briony; Toucanne, Samuel; Bayon, Germain; Schmidt, Sabine; Deflandre, Bruno; Dennielou, Bernard; Jouet, Gwenael; Garnier, Eline; Sakai, Saburo; Lamas, Ruth Martinez; Duros, Pauline; Toyofuku, Takashi; Sale, Aurelien; Belleney, Deborah; Bichon, Sabrina; Boissier, Audrey; Cheron, Sandrine; Pitel, Mathilde; Roubi, Angelique; Rovere, Mickael; Gremare, Antoine; Dupre, Stephanie; Jorry, Stephan.
In this short communication, we present a multidisciplinaty study of sedimentary records collected from a deep-sea interfluve proximal to the mouths of major northwestern Madagascan rivers. For the last 60 years, the seafloor has been repeatedly disturbed by the deposition of organic rich, tropical, terrestrial sediments causing marked reductions in benthic biodiversity. Increased soil erosion due to local land-use, deforestation and intensifying tropical cyclones are potential causes for this sedimentary budget and biodiversity shift. Our marine sedimentary records indicate that until now, these conditions have not occurred within the region for at least 20,000 years.
Tipo: Text
Palavras-chave: Multidisciplinary study; Benthic foraminifera; Land-use; Tropical cyclones.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00413/52488/53276.pdf

JERICO-NEXT. JRAP Synthesis and contribution to the strategy for the future
Provedor de dados: 5
Autores: Gremare, Antoine; Puillat, Ingrid; Karlson, Bengt; Artigas, Felipe; Nizzetto, Luca; Rubio, Anna; Laakso, Lauri; Mourre, Baptiste.
Six Joined Research activity Projects (JRAPS have been achieved within JERICO-NEXT. These projects have been set up to tackle some of the complex technical and scientifical issues associated with the implementation of Coastal Ocean Observing over a wide range of environmental conditions and spatiotemporal scales. The topics of these projects have been defined in relation with some of the Marine Strategy Framework Directive: JRAP 1: Biodiversity of plankton, harmful algal blooms and eutrophication, JRAP 2: Monitoring changes in microbenthic biodiversity, assessing potential environmental controls and functional consequences JRAP 3: Occurrence of contaminants in Northern coastal waters and biological responses JRAP 4: 4D characterization of trans-boundary...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00577/68871/67242.pdf

Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale
Provedor de dados: 5
Autores: Dubois, S.; Savoye, N.; Gremare, Antoine; Plus, Martin; Charlier, K.; Beltoise, A.; Blanchet, Hugues.
The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay - a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe - using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of...
Tipo: Text
Palavras-chave: Sediment organic matter; Primary producers; C and N stable isotopes; Zostera noltii; Arcachon Bay.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00073/18426/16059.pdf

Unexpected biotic resilience on the Japanese seafloor caused by the 2011 Tohoku-Oki tsunami
Provedor de dados: 5
Autores: Toyofuku, Takashi; Duros, Pauline; Fontanier, Christophe; Mamo, Briony; Bichon, Sabrina; Buscail, Roselyne; Chabaud, Gerard; Deflandre, Bruno; Goubet, Sarah; Gremare, Antoine; Menniti, Christophe; Fujii, Minami; Kawamura, Kiichiro; Koho, Karoliina Annika; Noda, Atsushi; Namegaya, Yuichi; Oguri, Kazumasa; Radakovitch, Olivier; Murayama, Masafumi; De Nooijer, Lennart Jan; Kurasawa, Atushi; Ohkawara, Nina; Okutani, Takashi; Sakaguchi, Arito; Jorissen, Frans; Reichart, Gert-jan; Kitazato, Hiroshi.
On March 11th, 2011 the Mw 9.0 2011 Tohoku-Oki earthquake resulted in a tsunami which caused major devastation in coastal areas. Along the Japanese NE coast, tsunami waves reached maximum run-ups of 40 m, and travelled kilometers inland. Whereas devastation was clearly visible on land, underwater impact is much more difficult to assess. Here, we report unexpected results obtained during a research cruise targeting the seafloor off Shimokita (NE Japan), shortly (five months) after the disaster. The geography of the studied area is characterized by smooth coastline and a gradually descending shelf slope. Although high-energy tsunami waves caused major sediment reworking in shallow-water environments, investigated shelf ecosystems were characterized by...
Tipo: Text
Palavras-chave: Palaeoceanography; Biodiversity.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00248/35914/34453.pdf