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| Registros recuperados: 21,797 | |
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| Gherardi, Jeanne Marie; Labeyrie, L.; Nave, S.; Francois, R.; Mcmanus, J. F.; Cortijo, E.. |
| Studies from the subtropical western and eastern Atlantic Ocean, using the Pa-231/Th-230 ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new sedimentary Pa-231/Th-230 records from North Atlantic cores between 1710 and 4550 m water depth. Comparing sedimentary Pa-231/Th-230 from different depths provides new insights into the evolution of the geometry and rate of deep water formation in the North Atlantic during the last 20,000 years. The Pa-231/Th-230 ratio measured in upper Holocene sediments indicates slow water renewal above similar to 2500 m and... |
| Tipo: Text |
Palavras-chave: MOC; North Atlantic; Deglaciation; 231Pa/230Th. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00233/34468/32855.pdf |
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| Gobert, Sylvie; Sartoretto, Stephane; Rico-raimondino, Valerie; Andral, Bruno; Chery, Aurelia; Lejeune, Pierre; Boissery, Pierre. |
| This paper describes the PREI (Posidonia oceanica Rapid Easy Index), a method used to assess the ecological status of seawater along Mediterranean French coasts. The PREI was drawn up according to the requirements of the Water Framework Directive (WFD 2000/60/EC) and was tested on 24 and 18 stations in PACA (Provence-Alpes-Cotes d'Azur) and Corsica, respectively. The PREI is based on five metrics: shoot density, shoot leaf surface area, E/L ratio (epiphytic biomass/leaf biomass), depth of lower limit, and type of this lower limit. The 42 studied stations were classified in the first four levels of status: high, good, moderate and poor. The PREI values ranged between 0.280 and 0.847; this classification is in accordance with our field knowledge and with our... |
| Tipo: Text |
Palavras-chave: Water Frame Directive; Ecological Quality Ratio; Coastal water; Mediterranean Sea; Posidonia oceanica; Seagrass. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6949.pdf |
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| Bourjea, Jerome; Benhamou, Simon; Mouquet, Pascal; Quod, Jean-pascal. |
| Les objectifs de la missions étaient les suivants: Composante 1 « Tortue » : cette composante est divisée en deux volets : (i) Etude des Processus de navigation des tortues vertes dans le sud ouest de l'océan Indien. Sur la base de 12 tortues déplacées à 100 milles de leur plage de ponte, en direction du sud ouest, afin de disposer d'un point de lâcher éloigné des principales îles de la région (Comores, Mayotte, Madagascar, Seychelles), les processus de navigation et d’orientation en fonction du champs magnétique terrestre et des courants seront étudiées grâce à des balises Argos. Cette composante est très semblable au travail qui a été menée lors de la mission Glorieuses 2008. (ii) Importance des îles du Sud Ouest de l’océan Indien en tant qu’habitat de... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00244/35517/34022.pdf |
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| Rigouin, Coraline; Delbarre Ladrat, Christine; Sinquin, Corinne; Colliec-jouault, Sylvia; Dion, M. |
| To find biocatalyst allowing depolymerization of new polysaccharides, one needs to get a sensitive and well adapted method to a screening program. This led us to compare biochemical methods of detection of the depolymerization. Currently used methods such as reducing sugars assays, double bond monitoring or molecular weight determination were tested to follow the kinetic of depolymerization with different enzyme / polysaccharide couples. The range of concentrations of assorted enzymes allowed us to identify the most sensitive and appropriate method to detect polysaccharide degradation. Reducing sugars assays are quantitative, sensitive and almost usable with all kind of polysaccharide but some compounds may interfere with them. When polysaccharide is... |
| Tipo: Text |
Palavras-chave: Detection; Enzyme; Depolymerization; Carbohydrate. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4723.pdf |
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| Renault, Tristan. |
| Les mollusques sont à la base d'une activité économique importante au sein de l'Union Européenne, la France étant un des premiers pays producteurs. La conchyliculture doit répondre aujourd'hui aux attentes de la société en termes de sécurité alimentaire. Des réglementations ont ainsi été établies, tao! au niveau des étapes primaires de pêche, d'élevage ou de récolte des mollusques, que lors de la transformation et de la commercialisation. Au cours des étapes de production et de récolte, une contamination des coquillages (toxines algales, agents infectieux ou polluants) peut survenir du fait, notamment, des conditions environnementales auxquelles sont confrontés les animaux. Des réseaux de surveillance ont ainsi été développés afin de détecter la présence... |
| Tipo: Text |
Palavras-chave: Polluants; Contamination microbiologique; Algues toxiques; Coquillages; Milieu marin; Réseaux; Surveillance. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/acte-6933.pdf |
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| Plus, Martin; Dumas, Franck; Stanisiere, Jean-yves; Maurer, Daniele. |
| A numerical model (MARS-2D) was developed, with the aim of describing the hydrodynamics that prevail in Arcachon Bay. Direct model results as well as derived mixing and transport time-scales (tidal prism, local and integrated flushing times, age of water masses), were used to understand the behaviour of water masses and exchanges between the Bay and its frontiers. Particular attention was paid to the processes that drive the hydrodynamics (tides, wind and rivers), in order to understand their respective influence. The Arcachon Bay hydrodynamic system appears primarily to be highly influenced by tides; secondarily, by winds. About two third of the lagoon total volume is flushed in and out at each tidal cycle, which represent a mean tidal prism of 384... |
| Tipo: Text |
Palavras-chave: Arcachon Bay; Tracer; Age of seawater; Flushing time; Tidal prism; Residual fluxes; Hydrodynamics. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6424.pdf |
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| Pike, Jennifer; Crosta, Xavier; Maddison, Eleanor J.; Stickley, Catherine E.; Denis, Delphine; Barbara, Loic; Renssen, Hans. |
| The available ecological and palaeoecological information for two sea ice-related marine diatoms (Bacillariophyceae), Thalassiosira antarctica Comber and Porosira glacialis (Grunow) Jorgensen, suggests that these two species have similar sea surface temperature (SST), sea surface salinity (SSS) and sea ice proximity preferences. From phytoplankton observations, both are described as summer or autumn bloom species, commonly found in low SST waters associated with sea ice, although rarely within the ice. Both species form resting spores (RS) as irradiance decreases, SST falls and SSS increases in response to freezing ice in autumn. Recent work analysing late Quaternary seasonally laminated diatom ooze from coastal Antarctic sites has revealed that... |
| Tipo: Text |
Palavras-chave: East Antarctica; Quaternary; Diatoms; Sea ice. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00220/33092/82663.pdf |
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| Blanchet, C. L.; Thouveny, N.; Vidal, L.. |
| Diagenetic processes are known to modify sedimentary records, but they can also reveal important paleoenvironmental changes. Here we investigate variations in sedimentary iron diagenesis and depositional environments for the last 35 ka by analyzing the rock magnetic and geochemical properties of two sediment cores collected in the Santa Barbara Basin (California). In organic-rich sediments, early diagenesis often leads to partial dissolution of detrital iron oxides and stepwise formation of authigenic pyrite (FeS2). The pyritization process takes place following several geochemical pathways, sometimes involving intermediate iron sulfide species such as greigite (Fe3S4). Sedimentary conditions in the basin appear to have recurrently favored preservation of... |
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| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00218/32936/31447.pdf |
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| Bourseau, Patrick; Vandanjon, Laurent; Jaouen, Pascal; Chaplain-derouiniot, Maryse; Masse, Anthony; Guerard, Fabienne; Chabeaud, Aurélie; Fouchereau-peron, Martine; Le Gal, Yves; Ravallec-ple, Rosenn; Berge, Jean-pascal; Picot, Laurent; Piot, Jean -marie; Batista, Ireneu; Thorkelsson, Gudjon; Delannoy, Charles; Jakobsen, Greta; Johansson, Inger. |
| The production by enzymatic treatment of fish protein hydrolysates (FPH) is a promising route to add value to fisheries proteinic co-products (fish frames, heads etc.). Indeed, FPH possess good nutritional properties and biological activities for food and feed uses. Pressure-driven membrane separations such as ultrafiltration (UF) and nanofiltration (NF) can be used after the hydrolysis to, increase the specific activities of the FPH. This paper discusses the impact of a two-step UF/NF process producing four different fractions on two industrial FPH with different hydrolysis degrees. Fractionation is carried out in "realistic" conditions for an industrial process, on highly concentrated FPH solutions (about 100 g of dry matter/L) at a high volume reduction... |
| Tipo: Text |
Palavras-chave: Peptidic profile; Fractionation process; Membrane separation; Nanofiltration; Ultrafiltration; FPH; Fish protein hydrolysate. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6653.pdf |
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| Mas, Virginie. |
| In the framework of the HERMES European project, this study aims to characterize the sedimentary processes acting in the Var turbiditic system, their impact on the morphology, and their evolution through time and space. This work uses data acquired along the system, including interface cores, acoustic data, and measurement in the water column (temperature, particulate fluxes, speed and direction of the currents) thanks to mooring lines. The Var turbiditic system is under the influences of the Northern Current and of the Var river by a direct connection. Sedimentary processes are related to gravity-driven currents, oceanic currents which remobilizes sediments and hemipelagic decantation. Gravity-driven processes are dominant and are responsible of 80% of... |
| Tipo: Text |
Palavras-chave: Var; Méditerranée; Bassin Ligure; Système turbiditique; Processus gravitaires; Courant de turbidité; Hyperpycnal; Crue; Var; Méditerranée; Ligurian Basin; Turbiditic system; Gravity-driven flows; Turbidity flows; Hyperpycnal; Flood. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00001/11219/7652.pdf |
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| Ifremer. |
| Ce rapport présente le bilan des résultats des actions programmées dans le cadre du Réseau de Suivi Lagunaire en 2008. Ce rapport est le second pour la nouvelle période du RSL (2007-2013). Les optimisations du suivi de l’eutrophisation y sont effectives avec notamment les lagunes qui ne feront l’objet d’un suivi de la colonne d’eau et du phytoplancton que tous les trois ans (Canet St Nazaire, Vendres, Grand Bagnas, Ponant, Médard), l’arrêt du suivi de l’étang du Rhône de ST Romans, la suppression et l’ajout de quelques stations et enfin l’arrêt de l’examen de la macrofaune invertébrée benthique pour le diagnostic complet de l’eutrophisation. Les actions menées en 2008 et rapportées dans le présent document sont : • Les diagnostics de l’eau et du... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00118/22922/20743.pdf |
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| Jorgensen, Christian; Ernande, Bruno; Fiksen, Oyvind. |
| Industrial fishing has been identified as a cause for life history changes in many harvested stocks, mainly because of the intense fishing mortality and its size-selectivity. Because these changes are potentially evolutionary, we investigate evolutionarily stable life-histories and yield in an energy-allocation state-dependent model for Northeast Arctic cod Gadus morhua. We focus on the evolutionary effects of size-selective fishing because regulation of gear selectivity may be an efficient management tool. Trawling, which harvests fish above a certain size, leads to early maturation except when fishing is low and confined to mature fish. Gillnets, where small and large fish escape, lead to late maturation for low to moderate harvest rates, but when... |
| Tipo: Text |
Palavras-chave: Life history evolution; Fishing induced changes; Fisheries management; Evolutionary modeling; Energy allocation. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6867.pdf |
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| Ifremer, Laboratoire Environnement Ressources d’Arcachon. |
| Les Laboratoires Environnement Ressources (LER) de l’Ifremer mettent en oeuvre, à l’échelle de l’ensemble du littoral métropolitain, une surveillance de la qualité du milieu marin côtier pour répondre aux objectifs environnementaux de la Directive Cadre sur l’Eau (DCE), aux obligations des conventions régionales marines (OSPAR et Barcelone) et aux objectifs sanitaires réglementaires concernant le suivi de la salubrité des coquillages des zones de pêche et de production conchylicoles. Cette surveillance s’appuie sur plusieurs réseaux : le réseau de contrôle microbiologique (REMI), le réseau de surveillance du phytoplancton et des phycotoxines (REPHY, le réseau d’observation de la contamination chimique (ROCCH), le réseau de surveillance benthique (REBENT).... |
| Tipo: Text |
Palavras-chave: REMI; REPHY; ROCCH; REMORA. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00112/22366/20046.pdf |
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| Nouguier, Frederic; Guerin, Charles-antoine; Chapron, Bertrand. |
| We investigate the statistical properties of a three-dimensional simple and versatile model for weakly nonlinear gravity waves in infinite depth, referred to as the "choppy wave model" (CWM). This model is analytically tractable, numerically efficient, and robust to the inclusion of high frequencies. It is based on horizontal rather than vertical local displacement of a linear surface and is a priori not restricted to large wavelengths. Under the assumption of space and time stationarity, we establish the complete first- and second-order statistical properties of surface random elevations and slopes for long-crested as well as fully two-dimensional surfaces, and we provide some characteristics of the surface variation rate and frequency spectrum. We... |
| Tipo: Text |
Palavras-chave: Sea surface statistics; Nonlinear gravity waves. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6832.pdf |
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| Suarez, J. A.; Gaxiola, G.; Mendoza, R.; Cadavid, S.; Garcia, G.; Alanis, G.; Suarez, A.; Faillace, J.; Cuzon, Gerard. |
| Fish meal (FM) has long been considered an essential ingredient for the formulation of shrimp feeds. Until recently, 12%FM was considered a minimum amount, below which weight gain would become reduced due to a reduction in feed intake. In order to test this perceived minimum value, an experiment was conducted on a long-term basis with 4 replicates. Four practical isonitrogenous and isoenergetic diets were formulated for Litopenaeus vannamei juveniles. Survival, weight gain, feed conversion ratio (FCR) and protein efficiency ratio were determined for 0, 6, 10 and 15% FM diets and a reference diet. Shrimp survival ranged from 84 to 86.5%. Shrimp fed a diet with 0% FM showed lower average weight and SGR compared to the other treatments (P<0.05). FCR of... |
| Tipo: Text |
Palavras-chave: Metabolism; Growth; Plant proteins; Substitution fish meal; L. vannamei. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6630.pdf |
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| Registros recuperados: 21,797 | |
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