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Registros recuperados: 10
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A relationship between deep-sea benthic oxygen demand and oceanic primary productivity ArchiMer
Christensen, Jp.
A diagenetic model of porewater O-2 was used to examine the relationship between organic carbon flux to the sediments and benthic oxygen demand (BOD). The model predicted that the organic carbon influx to sediments balances BOD as long as sediments are oxygenated. The critical rate occurs when O-2 at infinite depth disappears. With influxes exceeding the critical rate, the O-2 flux into the sediments via molecular diffusion can not consume all incoming organic matter, and anaerobic conditions result in BOD underestimating the carbon influx. Given that low rates of deep-sea BOD approximate the carbon influx below 9 g.C.m(-2).y(-1), a significant multilinear regression was found between published BOD, primary productivity (P-p, both in g.C.m(-2).y(-1))(,)...
Tipo: Text Palavras-chave: Fonds marins; Oxygène; Production primaire; Respiration; Sédiments; Deep-sea; Oxygen; Primary productivity; Respiration; Sediments.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00325/43578/44046.pdf
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Conséquences à long terme d'une exposition précose à l'hypoxie sur la physiologie du bar européen (Dicentrarchus labrax) et de la sole commune (Solea solea) ArchiMer
Vanderplancke, Gwenaelle.
The dissolved oxygen in seawater has steadily declined in many coastal marine ecosystems in the last 50 years because of global warming and increasing coastal human activities. This decrease in oxygen in seawater causes episodes of hypoxia increasingly frequent and severe in coastal and estuarine areas. Some organisms may escape these environmental constraints by migration or dispersion. Others, with limited swimming capabilities must implement physiological regulation (phenotypic plasticity) to enable them to adapt and survive. This is particularly the case of marine fish larvae that are likely to be present in coastal nursery at the end of their development. It is now well established that the regulations implemented by organisms to cope with their...
Tipo: Text Palavras-chave: Hypoxie; Conditionnement; Programmation environnementale; Poissons marins; Changement climatique; Oxygène; Dicentrarchus labrax; Solea solea; Marine fish; Climate change; Oxygen; Hypoxia; Conditioning; Environmental programming.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00498/60938/64332.pdf
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Etude des relations allométriques de l'huître plate (Ostrea edulis) relatives à la filtration et à la sonsommation d'oxygène en fonction de la température ArchiMer
Haure, Joel; Baud, Jean-pierre; Bougrier, Serge.
Introducing new species for shellfish farming is essential for expanding farmers' markets and for minimising the pathological risks that endangers professional marine aquaculture activities, which traditionally rely on only one species. Ifremer's Aquaculture and Pathological Genetics (GAP) laboratory participates in the mollusc genetics network (REGEMO). Since 1989, this network has been carrying out a selection programme for resistance or tolerance to Bonamia ostreae in European flat oysters (Ostrea edulis) to revitalize cultivation of this species on a national level.
Tipo: Text Palavras-chave: Température; Oxygène; Filtration; Ostrea edulis; Allométrie.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3254.pdf
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Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM ArchiMer
Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures..
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf
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Importance de l'oxygène dissous dans l'eau des bassins ostréicoles ArchiMer
Ladouce, Rémy; Le Dantec, Jean.
On constate souvent, surtout l'été, une mortalité anormale des huîtres dans les bassins, claires, dégorgeoirs ou dépôts, dont l'eau n'est renouvelée qu'à intervalles assez longs. Les ostréiculteurs ont l'habitude d'incriminer uniquement la chaleur, mais les essais de M. BOURY, en 1927, et de l'un de nous, en 19536, montrent qu'en définitive cette mortalité est provoquée, en grande partie, par le manque d'oxygène.
Tipo: Text Palavras-chave: Ostréiculture; Huître; Oxygène; Bassin ostréicole; Recommandation.
Ano: 1954 URL: http://archimer.ifremer.fr/doc/00003/11470/8029.pdf
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Influence d'un élevage ostréicole sur les flux de nutriments et d'oxygène dans un écosystème lagunaire ArchiMer
Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia.
The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of...
Tipo: Text Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf
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La "malaïgue" de l'été 1990 dans l’étang de Thau ArchiMer
Pichot, Paul; Juge, Claude; Guillou, Jean-louis.
In summer 1990, Thau, a Mediterranean lagoon was affected by a dystrophic crisis. An aerial survey was performed to observe polluted areas. The analysis of the main environmental water conditions have shown that suspended organic matter plays an important part in the development of this dystrophic crisis.
Tipo: Text Palavras-chave: Crise dystrophique; Oxygène; Matière organique; THAU; Méditerranée; Dystrophic crisis; Oxygen; Organic matter; Mediterranean lagoori.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00432/54333/58906.pdf
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La qualité des eaux dans l'Estuaire de la Gironde. 1- Traitement des données. 2 - Synthèse ArchiMer
Maurice, Laurence.
The main problem of the Girond estuary is a pollution by the cadmium. During this last ten years, the good quality of the water is proved by the analysis of the main physico - chemical and biochemical parameters and bacteria. But since 1989, straight to the Blayais power station, the BOD5 varied between 2 and 3,5 mg.l-1 and a diminution of the dissolved oxygen has been observed; it's probably caused by the accumulation of biodegradable organic matter in the maximum turbidity zone during years characterized by low river flows. For average river flow, urban discharges takes part for 20 % in total fluxes of BD05; in 1991, this part attempts 35 %. During the last 7 years, the pluriannual evolution of the nitrate concentrations measured in the Garonne river...
Tipo: Text Palavras-chave: Oxygène; Sels nutritifs; Matière organique; Bactéries; Apports; Estuaire Gironde; Oxygen; Nutrients; Organic matter; Bacteria; Fluxes; Gironde estuary.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00037/14855/12178.pdf
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Les risques conchylicoles en Baie de Quiberon. Troisième partie : le risque d’hypoxie pour l’huître creuse Crassostrea gigas. Rapport final du projet Risco 2010-2013 ArchiMer
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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Variability in benthic oxygen fluxes during the winter-spring transition in coastal sediments: an estimation by in situ micro-electrodes and laboratory mini-electrodes ArchiMer
Lansard, B; Rabouille, C; Massias, D.
Two expeditions were achieved at the winter-spring transition in the Golfe de Fos (Mediterranean Sea) at a site situated at 21 m depth. An in situ autonomous oxygen profiler and laboratory oxygen mini-electrodes were used to measure the oxygen distribution in the sediments and calculate the diffusive oxygen fluxes. Clearer waters during the second expedition promoted a rapid shift from a net heterotrophic environment to a photosynthesis-dominated sediment. The diffusive exchange fluxes of oxygen through the sediment-water interface varied from an average consumption of 5.3 mmol m(-2) d(-1) (February) to a net production of 12 mmol m(-2) d(-1) (March). At both periods, a large spatial heterogeneity was recorded by the different electrodes, with a larger...
Tipo: Text Palavras-chave: Oxygène; Micro-électrodes in situ; Biogéochimie; Cycle du carbone; Sédiment côtier; Oxygen; In situ micro-electrodes; Biogeochemistry; Carbon cycle; Coastal sediment.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43272/43003.pdf
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