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Registros recuperados: 7
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Adaptation du métabolisme respiratoire de l'huître creuse Crassostrea gigas ArchiMer
Le Moullac, Gilles.
Summer mortality of the oyster result from the interaction of many factors. A respiratory assumption proposes a link between the supposed causes of the energy state, the cultivation methods and the medium. This work is focused towards the search for specific metabolic markers of environmental stresses. The cDNA of genes coding for PK and PEPCK were cloned and sequenced in order to detect their regulation level. The sediment nearness affects the state of energy reserves, the metabolic pathways of energy production implying a regulation of the PK. Face to the dissolved oxygen decline, oysters were oxyregulator but with a low regulation ability. In hypoxia, glycolysis was slowed down. PK activity was inhibited resulting from an increase in alanine sensitivity...
Tipo: Text Palavras-chave: Régulation; Enzyme; Expression génique; Anoxie; Bivalve.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-4315.pdf
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Etude de la matière organique et demande en oxygène des sédiments en baie de vilaine ArchiMer
Merceron, Michel.
After the fish mortality through an anoxia, which occured during the summer of 1982 in the bay of Vilaine, the oxygen consumption of the sediment was investigated during spring and summer. It was found moderately important, submitted to limited evolutions along time and on different zones. A significant correlation with the organic carbon content of sediment could not be established. The oxygen consumption of the bottom waters was approached. In the bay of Vilaine as a whole, it was found more important than the sediment consumption. It could vary in a wide range, till leading to pronounced hypoxias, especially during phytoplankton. (Not controlled OCR)
Tipo: Text Palavras-chave: Organic matter; Water oxygen consumption; Sediment oxygen consumption; Anoxia; Dissolved oxygen; Coastal waters; Matière organique; Respiration de la phase liquide; Respiration du sédiment; Anoxie; Oxygène dissous; Eaux côtières.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-2666.pdf
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Impact du barrage d'Arzal sur la qualité des eaux de l'estuaire et de la baie de la Vilaine ArchiMer
Merceron, Michel.
The Arzal dam upon the Vilaine estuary provokes an aggravation of a recurrent summer hypoxia of the bottom waters in the bay of Vilaine.
Tipo: Text Palavras-chave: Suspended sediments; Salinity; Coastal zone; Dam estuary; Oxygen depletion; Matières en suspension; Salinité; Zone côtière; Estuaire; Barrage; Anoxie.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2658.pdf
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Les malaïgues de l'étang de Thau. Tome 1. Description des malaïgues. Moyens de lutte, recommandations ArchiMer
Hamon, Pierre-yves; Vercelli, Catherine; Pichot, Yves; Lagarde, Franck; Le Gall, Patrik; Oheix, Jocelyne.
The Thau Lagoon, from time to time is the area of crisis locally called « malaïgues ». The characteristics of these « malaïgues » are the lack of oxygen interesting all the water column and the white color of the waters during the phenomena. The result of this anoxy is the death of cultivated molluscs. From 1969 to 2000 nine « malaïgues » have been observed. They occur during the Summer period but in different locations. The surface of the areas concerned are very different according the year. Different means of struggle have been tried and are described.
Tipo: Text Palavras-chave: Anoxie; Malaïgue; Description; Recommandations; Thau.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00038/14951/12277.pdf
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Les malaïgues de l'étang de Thau. Tome 2. Relations entre les conditions physico-chimiques, la météorologie et les conditions d'apparition des crises dystrophiques ArchiMer
Hamon, Pierre-yves; Vercelli, Catherine; Pichot, Yves; Lagarde, Franck; Le Gall, Patrik; Oheix, Jocelyne.
In the first volume dystrophie crisis in the Thau lagoon since 1969 are described. In the second volume, meteorological parameters (temperature, wind, atmospheric pressure) are compared during the dystrophie crisis to show if either one or several parameters could explain the emergence of these phenomena . It seems that only a mathematical model could be able to give explanation.
Tipo: Text Palavras-chave: Anoxie; Malaïgue; Météorologie; Lagune de Thau.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00038/14953/12309.pdf
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L'eutrophisation des eaux marines et saumâtres en Europe, en particulier en France ArchiMer
Menesguen, Alain; Aminot, Alain; Belin, Catherine; Chapelle, Annie; Guillaud, Jean-francois; Joanny, Michel; Lefebvre, Alain; Merceron, Michel; Piriou, Jean-yves; Souchu, Philippe.
In order to be able to count the cases of coastal eutrophication and to propose methods to monitor as well as to reduce these phenomena, first of all it is necessary to precisely define the word eutrophication itself. Instead of the strict etymological definition, that is to say a progression of the enrichment of a medium, we will rather retain the concept of a state enriched at a point such as it causes harmful effects on the ecosystem, and nuisances to man's activities. Based on the average chemical equations of the organic matter synthesis/degradation in the sea, this operational definition thus puts forwards the harmful consequences of enrichment, i.e. the production of an excessive algal biomass, sometimes unbalanced from the point of view of...
Tipo: Text Palavras-chave: Alexandrium; Phaeocystis; Monostroma; Ulva; Dilution plume; Water trapping; Anoxia; Nitrogen and phosphorus loadings; Red tides; Phytoplankton blooms; Green tides; Eutrophication; Alexandrium; Phaeocystis; Monostroma; Ulva; Panache de dilution; Confinement; Anoxie; Phosphate; Nitrate; Apports terrigènes; Eaux colorées; Blooms phytoplanctoniques; Marées vertes; Eutrophisation.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-22.pdf
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Suivi de flotteurs dans la zone Loire Vilaine ArchiMer
Kerdreux, Michel; Merceron, Michel; Le Hir, Pierre; Breton, Marguerite.
During one month in summer of 1985 the courses of ten drifters, dropped at the mouth of Loire and Vilaine Rivers, were monitored. Results show: -the marked influence of wind on the movement of this region's bodies of water, -the possibility of an intrusion of the Loire's waters in Vilaine Bay, -the very likely absence of any influence of the Loire's waters in the bottom waters' anoxia that occurred in Vilaine Bay during the summer of 1982.
Tipo: Text Palavras-chave: Anoxia; Vilaine; Currents; Drifters; Anoxie; Vilaine; Loire; Courants; Flotteurs.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-2653.pdf
Registros recuperados: 7
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