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Registros recuperados: 84 | |
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Pouvreau, Stephane; Bernard, Ismael; Le Souchu, Pierrick; Huvet, Arnaud; Talarmain, Eric; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Neaud-masson, Nadine; Bedier, Edouard; Martin, Anne-genevieve; Claude, Serge; Langlade, Aime; Bouget, Jean-francois; Hitier, Benoist; Stanisiere, Jean-yves; Breerette, Stephane; Robert, Stephane; Guilpain, Patrice; Seugnet, Jean-luc; Guesdon, Stephane; Soletchnik, Patrick; Le Moine, Olivier; Dumas, Franck; Quemener, Loic; Barbot, Stephane; Repecaud, Michel; Mille, Dominique; Geay, A; Bouquet, Anne-lise. |
L’ostréiculture constitue la principale activité aquacole française. Cette activité de quasi-monoculture, basé sur l’élevage de l’huître creuse, Crassostrea gigas, repose en grande partie sur le recrutement naturel de l’espèce qui assure 70% des besoins en jeunes huîtres (naissain). Or, depuis une dizaine d'années, dans les bassins d'Arcachon et de Marennes-Oléron, principaux centres de captage français pour l’huître creuse, la collecte du naissain ou captage devient encore plus variable qu’auparavant: à des années de captage presque nul (par exemple les années 2002, 2005, 2007) succèdent des années où il est surabondant (par exemple les années 2003 ou 2006). En parallèle, et probablement en raison du progressif réchauffement des eaux, la reproduction de... |
Tipo: Text |
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Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16489/13995.pdf |
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Idier, Deborah; Dumas, Franck; Muller, Heloise. |
The English Channel is characterised by strong tidal currents and a wide tidal range, such that their influence on surges is expected to be non-negligible. In order to better assess storm surges in this zone, tide-surge interactions are investigated. A preliminary data analysis on hourly surges indicates some preferential times of occurrence of large storm surges at rising tide, especially in Dunkerque. To examine this further, a numerical modelling approach is chosen, based on the 2DH shallow-water model (MARS). The surges are computed both with and without tide interaction. For the two selected events (the November 2007 North Sea and March 2008 Atlantic storms), it appears that the instantaneous tide-surge interaction is seen to be non-negligible in the... |
Tipo: Text |
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Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00131/24176/22355.pdf |
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Dreves, Luc; Lampert, Luis; Abernot, Chantal; Martin, Jocelyne; Arzel, Pierre; Dumas, Franck; Latrouite, Daniel; Schlaich, Ivan; Woehrling, Daniel. |
This synthesis report assesses the current state of the marine hydrobiological knowledge acquired in the surroundings of the Flamanville electronuclear site (north-west of Cotentin), in the framework of the various project and monitoring programs in the pelagic, benthic and halieutic domains carried out on this site since 1976. Each domain is divided, as much as necessary, into different study areas such as hydrobiology, phytoplankton, microbiology, crustacean larvae or macrophyte algae. For each area, a series of parameters, considered as representative of the evolution of this area, is studied. In this way, for the hydrological area, the sea water temperature and salinity, the mineral nutriment concentrations, the holagen compounds and the boron are... |
Tipo: Text |
Palavras-chave: Pelagos; Halieutique; Benthos; Surveillance; Synthèse; Flamanville; Centrale nucléaire. |
Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-6405.pdf |
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Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte. |
This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon... |
Tipo: Text |
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay. |
Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf |
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Garreau, Pierre; Dumas, Franck; Louazel, Stephanie; Correard, Stephanie. |
The Mediterranean Sea is often referred as a “pocket ocean” exhibiting many processes that are primary interest the global ocean circulation given the opportunity to investigate a large panel of oceanic features in a relatively restrained area. Recent field experiments based on the multi-plateform integrated monitoring MOOSE or on intensive targeted experiment HYMEX revisited the hydrology and the dynamics of the Western Basin. Such approaches emphasized the ubiquity of the fine scale dynamics in the Mediterranean dynamics. An overview of the observed processes during 5 recent fields experiments are presented and discussed regarding meso- and submeso-scale processes. |
Tipo: Text |
Palavras-chave: Mesoscale phenomena; Western Mediterranean; Fronts. |
Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00582/69398/67247.pdf |
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Riou, Philippe; Le Saux, Jean-claude; Dumas, Franck; Le Guyader, Soizick; Le Goff, R.; Maheux, Frank; Lamort, Laure; Pommepuy, Monique. |
Climate change contributes to local weather modifications such as storm events and heavy rainfall, and in particular, changes in the frequency and intensity of extreme storm and rainfall events. Observations have indicated that rainfall-runoff processes, like sewage overflow may induce fecal contamination in coastal water. Pathogens present in runoff water could therefore contaminate shellfish and be responsible for food-borne disease outbreaks. Mathematical models for this were used to predict the effect of climate modifications on shellfish quality. Using a hydrodynamic model, simulations of water quality conditions under a variety of storm event scenarios were run and are presented here for a harvesting area in France. Major storm events occurring in... |
Tipo: Text |
Palavras-chave: Modeling; Seawater fecal contamination; E. coli; Virus; Shellfish; Climate change. |
Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00066/17739/15261.pdf |
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Bailly Du Bois, P.; Dumas, Franck; Solier, L.; Voiseux, C.. |
Appropriate field data are required to check the reliability of hydrodynamic models simulating the dispersion of soluble substances in the marine environment. This study deals with the collection of physical measurements and soluble tracer data intended specifically for this kind of validation. The intensity of currents as well as the complexity of topography and tides around the Cap de La Hague in the centre of the English Channel make it one of the most difficult areas to represent in terms of hydrodynamics and dispersion. Controlled releases of tritium-in the form of HTO-are carried out in this area by the AREVA-NC plant, providing an excellent soluble tracer. A total of 14,493 measurements were acquired to track dispersion in the hours and days... |
Tipo: Text |
Palavras-chave: Modelling; Data collection; Tritium; Dispersion; Tidal dynamics; English Channel. |
Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00077/18775/16484.pdf |
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Andrefouet, Serge; Thomas, Yoann; Dumas, Franck; Lo, Cedrik. |
Spat collecting of the black lip oyster (Pinctada margaritifera) is the foundation of cultured black pearl production, the second source of income for French Polynesia. To understand spat collecting temporal and spatial variations, larval supply and its origin need to be characterized. To achieve this, it is necessary to account for the stock of oysters, its distribution and population characteristics (size distribution, sex-ratio). While the farmed stock in concessions can be easily characterized, the wild stock is elusive. Here, we investigate the distribution and population structure of the wild stock of Ahe and Takaroa atolls using fine-scale bathymetry and in situ census data. Stocks were surprisingly low (∼666,000 and ∼1,030,000 oysters for Ahe and... |
Tipo: Text |
Palavras-chave: Invertebrate population; Aquaculture; Spat collecting; French Polynesia; Atoll bathymetry; Wild stock assessment. |
Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00343/45412/49287.pdf |
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Stanisiere, Jean-yves; Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Gabellec, Raoul; Retho, Michael; Quinsat, Kevin; Leclerc, Emilie; Cugier, Philippe; Dussauze, Morgan; Menesguen, Alain; Dumas, Franck; Gohin, Francis; Augustin, Jean-marie; Ehrhold, Axel; Sinquin, Jean-marc; Goubert, Evelyne; Dreano, Alain. |
The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters were reported in summer 2006 in this bay, exclusively located in the deep muddy area with a positive gradient eastward. A validated biogeochemical model was applied in order to simulate the dissolved oxygen over 2000-2006 : it revealed several episodes of hypoxia, more or less intense according to years, but with the same spatial distribution. This approach proved 2006 to be the most hypoxic year since 2000. The hypoxia was due to a rare conjunction of 3 factors :... |
Tipo: Text |
Palavras-chave: Baie Quiberon; Crassostrea gigas; Huître; Mortalité; Croissance; Hypoxie; Oxygène; Modèle; Upwelling; Loire; Vilaine; Quiberon; Crassostrea gigas; Oyster; Mortality; Growth; Hypoxia; Oxygen; Model; DEB; Upwelling; Loire; Vilaine. |
Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00180/29131/27535.pdf |
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Perrot, Thierry; Rossi, Nadege; Menesguen, Alain; Dumas, Franck. |
First recorded in the 1970s, massive green macroalgal blooms have since become an annual recurrence in Brittany, France. Eutrophication (in particular to anthropogenic nitrogen input) has been identified as the main factor controlling Ulva ‘green tide’ events. In this study, we modelled Ulva proliferation using a two-dimensional model by coupling hydrodynamic and biological models (coined ‘MARS-Ulves’) for five sites along the Brittany coastline (La Fresnaye Bay, Saint-Brieuc Bay, Lannion Bay, Guissény Bay and Douarnenez Bay). Calibration of the biological model was mainly based on the seasonal variation of the maximum nitrogen uptake rate (VmaxN) and the half-saturation constant for nitrogen (KN) to reproduce the internal nutrient quotas measured in situ... |
Tipo: Text |
Palavras-chave: 2D model; Ulva; Eutrophication; Brittany coastal waters; Tracers; Nutrient reductions. |
Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00171/28268/26517.pdf |
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Registros recuperados: 84 | |
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