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Registros recuperados: 13
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Approche de l'activité de prédation de l'huître creuse Crassostrea gigas par les bigorneaux perceurs Ocenebra erinacea et Ocenebra inornata. Régulation des populations de perceurs Ocenebra erinacea et Ocenebra inornata : survie vis-à-vis des températures négatives et action du brûlage sur des pontes naturelles ArchiMer
Robert, Stephane; Grangere, Karine; Amiot, Jean-baptiste; Le Moine, Olivier; Soletchnik, Patrick; Guilpain, Patrice; Seugnet, Jean-luc; Geairon, Philippe; Goulletquer, Philippe; Razet, Daniel; Faury, Nicole; Garcia-meunier, Pascale; Martel, C..
Parmi les problèmes qui handicapent la production du bassin, la surexploitation du milieu trophique est souvent mise en référence (Bacher 1989, Héral, 1991) de la même façon des mortalités importantes sont régulièrement enregistrées principalement en période estivale Lodato M.I., 1997, Goulettquer, 1998, Soletchnick, 1998, 2000. Depuis la fin des années 1990 la prédation par bigorneaux perceurs est un problème important régulièrement signalé par les professionnels, au point que la section régionale a organisé un ramassage collectif des perceurs en avril 2001 . Ce problème n' est pas nouveau, dans les années 30, la prédation par Ocenebra erinacea était enregistrée pour ses ravages sur les bancs d'élevage de La Rochelle, Bourgneuf ou Arcachon (Robert S., et...
Tipo: Text Palavras-chave: Bigorneaux perceurs; Ocenebra erinacea; Ocenebra inornata; Huître creuse; Crassostrea gigas; Prédation.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00077/18791/16367.pdf
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Benthic and fish aggregation inside an offshore wind farm: Which effects on the trophic web functioning? ArchiMer
Raoux, Aurore; Tecchio, Samuele; Pezy, Jean-philippe; Lassalle, Geraldine; Degraer, Steven; Wilhelmsson, Dan; Cachera, Marie; Ernande, Bruno; Le Guen, Camille; Haraldsson, Matilda; Grangere, Karine; Le Loc'H, Francois; Dauvin, Jean-claude; Niquil, Nathalie.
As part of the energy transition, the French government is planning the construction of three offshore wind farms in Normandy (Bay of Seine and eastern part of the English Channel, north-western France) in the next years. These offshore wind farms will be integrated into an ecosystem already facing multiple anthropogenic disturbances such as maritime transport, fisheries, oyster and mussel farming, and sediment dredging. Currently no integrated, ecosystem-based study on the effects of the construction and exploitation of offshore wind farms exists, where biological approaches generally focused on the conservation of some valuable species or groups of species. Complementary trophic web modelling tools were applied to the Bay of Seine ecosystem (to the 50...
Tipo: Text Palavras-chave: Marine renewable energies; Reef effect; Wind farm; Ecopath with Ecosim; Ecosystem-based approach.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00347/45843/46723.pdf
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BESTCLIM. Buccin Espèce SenTinelle pour le CLIMat ArchiMer
Hegron – Mace, Laurence; Legrand, Véronique; Kellner, Kristell; Grangere, Karine; Cochard, Marie-laure; Vigneau, Joel; Daures, Fabienne.
La Baie de Granville représente la première région française et européenne de pêche du buccin. Même si cette ressource génère une activité économique importante à l’échelle de la Normandie avec un volume de 8 800 tonnes, 16.82 millions € en 2014 (source SIH), elle reste néanmoins vulnérable. BESTCLIM a pour objectif de 1) Développer la connaissance du cycle de vie du buccin, 2) Evaluer l’activité de la pêcherie et l’état du stock de buccin en Ouest Cotentin avec des méthodes appropriées, 3) Caractériser les aspects socio-économiques de la pêcherie. L’élévation de la température de l’eau impacte la reproduction du buccin en retardant le déclenchement de la gamétogenèse des mâles. Elle a pour effet de réduire de manière importante l’émission de pontes par...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00422/53394/54435.pdf
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Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale ArchiMer
Lienart, Camilla; Savoye, Nicolas; Bozec, Yann; Breton, Elsa; Conan, Pascal; David, Valerie; Feunteun, Eric; Grangere, Karine; Kerherve, Philippe; Lebreton, Benoit; Lefebvre, Sebastien; L'Helguen, Stephane; Mousseau, Laure; Raimbault, Patrick; Richard, Pierre; Riera, Pascal; Sauriau, Pierre-guy; Schaal, Gauthier; Aubert, Fabien; Aubin, Sebastien; Bichon, Sabrina; Boinet, Christophe; Bourasseau, Line; Breret, Martine; Caparros, Jocelyne; Cariou, Thierry; Charlier, Karine; Claquin, Pascal; Cornille, Vincent; Corre, Anne-marie; Costes, Laurence; Crispi, Olivier; Crouvoisier, Muriel; Czamanski, Marie; Del Amo, Yolanda; Derriennic, Herve; Dindinaud, Francois; Durozieri, Maia; Hanquiez, Vincent; Nowaczyk, Antoine; Devesa, Jeremy; Ferreira, Sophie; Fornier, Michel; Garcia, Fabrice; Garcia, Nicole; Geslin, Sandrine; Grossteffan, Emilie; Gueux, Aurore; Guillaudeau, Julien; Guillou, Gael; Joly, Orianne; Lachaussee, Nicolas; Lafont, Michel; Lamoureux, Jezabel; Lecuyer, Eric; Lehodey, Jean-paul; Lemeille, David; Leroux, Cedric; Mace, Eric; Maria, Eric; Pineau, Philippe; Petit, Franck; Pujo-pay, Mireille; Rimelin-maury, Peggy; Sultan, Emmanuelle.
In coastal systems, the multiplicity of sources fueling the pool of particulate organic matter (POM) leads to divergent estimations of POM composition. Eleven systems (two littoral systems, eight embayments and semi-enclosed systems and one estuary) distributed along the three maritime façades of France were studied for two to eight years in order to quantify the relative contribution of organic matter sources to the surface-water POM pool in coastal systems. This study was based on carbon and nitrogen elemental and isotopic ratios, used for running mixing models. The POM of the estuary is dominated by terrestrial material (93% on average), whereas the POM of the other systems is dominated by phytoplankton (84% on average). Nevertheless, for the latter...
Tipo: Text Palavras-chave: Particulate organic matter; Coastal systems; C and N stable isotopes; C:N ratio; Mixing model.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00374/48550/48871.pdf
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Le risque "Eau douce" : analyse des sites en Baie des Veys et du Bassin de Marennes Oléron ArchiMer
Soletchnik, Patrick; Ropert, Michel; Grangere, Karine; Munaron, Dominique; Struski, C..
The role of freshwater is more difficult to comprehend. It might act as a detrital organic matter "vector" (during floods) or an anthropic waste "vector" (toxic molecules from agriculture or other industries; nutritive salts from leaching...). Its effect has been demonstrated in the Bay of Veys (Ropert and Kopp, 2000; Misko, 2003), and especially its intense but transient action, presenting high freshenings, as recorded by high-frequency multiparameter probes since 1996 [15]. On this oyster culture site, mortality could then result from osmotic shocks. The "mortality-flow" relationship, demonstrated in 2003 in the Bay of Veys (Misko 2003), has to be specified. It is found in a more sustained way in the Marennes Oléron Bay (R2 = 0.40). This result also...
Tipo: Text Palavras-chave: MOREST; Impact; Physiologie; Pluviométrie; Apport eau douce; Mortalités; Crassostrea gigas; Huîtres.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-3409.pdf
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Les mollusques invasifs des bassins conchylicoles du littoral Manche-Atlantique : diversité et structure génétiques des populations invasives, compétition avec les taxons indigènes, gestion du risque pour les écosystèmes et la conchyliculture ArchiMer
Bachelet, Pierrre; De Montaudouin, Xavier; Desclaux, C.; Mairesse, G.; Raigne, H.; Randriambao, K.; Garcia Meunier, Pascale; Martel, C.; Pascal, P. Y.; Sauriau, Pierre-guy; Simon-bouhet, Benoît; Robert, Stephane; Geairon, Philippe; Goulletquer, Philippe; Grangere, Karine; Guilpain, Patrice; Le Moine, Olivier; Rossi, Nadege; Seugnet, Jean-luc; Soletchnik, Patrick.
Shellfish areas usually receive a large number of introduced species. During the present project, we specially focused on 4 marine benthic molluscs introduced in shellfish areas along the Channel and Atlantic coasts of France: the gastropods Crepidula fornicata, Ocinebrellus inornatus and Cyclope neritea, and the bivalve Ruditapes philippinarum. Our study was conducted according to three main axes: (i) the characterization of introduction and expansion patterns of species within their newly colonized area. In the three invasive gastropods C. fornnicata, C. neritea and 0. inornatus, a high level of genetic diversity was detected in the French populations which indicated a complex process of introduction (with multiple population sources or secondary...
Tipo: Text Palavras-chave: Recommandations; Transfert; Ecosystèmes marins; Insularité; Expansion; Introduction espèces; Invasions biologiques; Mollusques.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-3305.pdf
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Modelling the influence of environmental factors on the physiological status of the Pacific oyster Crassostrea gigas in an estuarine embayment; The Baie des Veys (France) ArchiMer
Grangere, Karine; Menesguen, Alain; Lefebvre, Sébastien; Bacher, Cedric; Pouvreau, Stephane.
It is well known that temporal changes in bivalve body mass are strongly correlated with temporal variations in water temperature and food supply. In order to study the influence of the year-to-year variability of environmental factors on oyster growth, we coupled a biogeochemical sub-model, which simulates trophic resources of oysters (i.e. phytoplankton biomass via chlorophyll a), and an ecophysiological sub-model, which simulates growth and reproduction (i.e. gametogenesis and spawning), using mechanistic bases. The biogeochemical sub-model successfully simulated phytoplankton dynamics using river nutrient inputs and meteorological factors as forcing functions. Adequate simulation of oyster growth dynamics requires a relevant food quantifier compatible...
Tipo: Text Palavras-chave: Baie des Veys; Normandy; France; Physiological Status; Phytoplankton Carbon Concentration; Food Supply; Temperature; Dynamic Energy Budget model; Biogeochemical Model.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6809.pdf
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Modelling the spatial heterogeneity of ecological processes in an intertidal estuarine bay: dynamic interactions between bivalves and phytoplankton ArchiMer
Grangere, Karine; Lefebvre, Sebastien; Bacher, Cedric; Cugier, Philippe; Menesguen, Alain.
Spatial patterns in ecological communities result from a combination of physical and biological factors. In an estuarine intertidal bay, spatial differences have been found in the structure of phytoplanktonic communities and in the biological performance of cultivated oysters. It has been hypothesised that trophic heterogeneity exists, although the mechanisms controlling it remain undefined. Spatial and temporal interactions in the structure of phytoplanktonic biomass and in the biological performance of cultivated oysters were highlighted in this estuarine intertidal bay using a 2-dimensional hydrodynamic model coupled to a nutrient-phytoplankton-zooplankton bivalve food web model. The coupled models allowed a reproduction in space and time of variations...
Tipo: Text Palavras-chave: Spatial heterogeneity; Hydrodynamics; Ecosystem model; Food supply; Bivalves; Dynamic energy budget model; Physiological status; Baie des Veys.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12854/9819.pdf
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On the interest of using field primary production data to calibrate phytoplankton rate processes in ecosystem models ArchiMer
Grangere, Karine; Lefebvre, Sebastien; Menesguen, Alain; Jouenne, Fabien.
In many ecosystem models based on empirical formulations, parameters generally are calibrated in order to achieve the best fit between measured and simulated chlorophyll a standing stocks. An accurate calibration of rate processes as primary production rarely is taken into account. In this paper, we test the usefulness of calibration of phytoplankton photosynthetic processes in an ecosystem model using field primary production data. We used 18 months of photosynthetic process data from the Baie des Veys ecosystem (Normandy, France). Five empirical formulations of photosynthesis-irradiance curve models amongst the most widely used were tested. In each formulation, the variability of photosynthetic parameters (i.e. the light-saturated rate of photosynthesis...
Tipo: Text Palavras-chave: Baie des Veys; Normandy; France; Diatoms; Chlorophyll a to carbon ratio; Parameter optimisation; Mechanistic formulations; Empirical formulations; Photosynthesis irradiance curve.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6810.pdf
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Possibilities to prevent Crassostrea gigas oyster summer mortality in France ArchiMer
Samain, Jean-francois; Ropert, Michel; Bedier, Edouard; Soletchnik, Patrick; Mazurie, Joseph; Le Coz, Florence; Blin, Jean-louis; Mille, Dominique; Pajot, Régis; Haffray, Patrick; Bacher, Cedric; Grangere, Karine; Grangere, Karine; Pouvreau, Stephane; Bourles, Yves; Gohin, Francis; Woerther, Patrice; Boudry, Pierre.
Summer mortality has been reported in the Pacific oyster, Crassostrea gigas, for many years in Japan, US and Europe. It affects both adults and juveniles and the causes of this phenomenon are complex. Environmental, physiological or pathological putative causes were studied all over the world. Recently, the MOREST project ((MORtalitEStivale) a multidisciplinary project (2001-2005) focused on his problem led to a better understanding of this phenomenon in France. The results showed in these geographical conditions, the main interactions between the oysters, their environment and certain pathogens.
Tipo: Text Palavras-chave: Interaction model; Environmental parameters; Summer mortality; Crassostrea gigas; Pacific oyster.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/acte-3476.pdf
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Réponse écophysiologique de l'huître creuse Crassostrea gigas à la variabilité spatio-temporelle des facteurs environnementaux. Etude par modélisation écologique ArchiMer
Grangere, Karine.
The spatial and temporal variability in biotic and abiotic environmental factors influence the ecophysiological response of bivalves (growth, reproduction and survival). In this study, the physiological status of cultivated oysters in the Baie des Veys ecosystem was studied using an ecosystem model which simulates ecophysiological processes of oysters (growth, maintenance and reproduction) and environmental processes which control oyster responses (river inputs, meteorology, hydrodynamic). In order to assess the spatial and temporal scales of variability in this ecosystem, two modelling approaches were developed. Temporal variability from the seasonal to the inter-annual scale was studied using a box model. Results showed that the variability in...
Tipo: Text Palavras-chave: Baie desVeys; Terrestrial inputs; Physiological state; Hydrodynamism; Oyster mortality; Primary production; Ecological model; Crassostrea gigas; Baie des Veys; Apports terrigènes; État physiologique; Hydrodynamisme; Mortalités d'huîtres; Productivité primaire; Modèles écologiques; Crassostrea gigas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6785.pdf
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Simulation de l'influence des apports des bassins versants sur les concessions ostréicoles de la Baie des Veys (Baie de Seine Occidentale) ArchiMer
Grangere, Karine.
Depuis les années 1940, d'importants phénomènes de mortalités des juvéniles de l'huître creuse Crassostrea gigas ont été observés en période estivale dans différents sites de production à travers le monde. En baie des Veys les principaux épisodes de mortalités observés au cours de ces dix dernières années ont conduit à des pertes allant de 17,5 jusqu'à 40 % de la biomasse totale en élevage. Ce travail s'inscrit dans le cadre du volet environnement du programme MOREST (MORtalités ESTivales) lancé en 2001 par l'IFREMER. L' objectif est d'étudier l'influence des apports provenant des bassins versants sur les concessions ostréicoles de la baie des Veys. Pour cela, des simulations ont été réalisées à l'aide d'un modèle hydrodynamique en 2 Dimensions...
Tipo: Text Palavras-chave: Modèle hydrodynamique 2D; Baie des Veys; Apports fluviaux; Débit; Vent; Temps de résidence; Trajectoires.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00449/56100/57636.pdf
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Spatial Variability of Benthic-Pelagic Coupling in an Estuary Ecosystem: Consequences for Microphytobenthos Resuspension Phenomenon ArchiMer
Ubertini, Martin; Lefebvre, Sebastien; Gangnery, Aline; Grangere, Karine; Le Gendre, Romain; Orvain, Francis.
The high degree of physical factors in intertidal estuarine ecosystem increases material processing between benthic and pelagic compartments. In these ecosystems, microphytobenthos resuspension is a major phenomenon since its contribution to higher trophic levels can be highly significant. Understanding the sediment and associated microphytobenthos resuspension and its fate in the water column is indispensable for measuring the food available to benthic and pelagic food webs. To identify and hierarchize the physical/biological factors potentially involved in MPB resuspension, the entire intertidal area and surrounding water column of an estuarine ecosystem, the Bay des Veys, was sampled during ebb tide. A wide range of physical parameters (hydrodynamic...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00090/20126/17775.pdf
Registros recuperados: 13
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