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Composition de la matière organique particulaire dans les eaux du bassin de Marennes-Oléron : apport énergétique pour la nutrition de l'huître ArchiMer
Heral, Maurice; Razet, Daniel; Maestrini, Serge; Garnier, Jacqueline.
A twice monthly study shows that the major amount of organic material is from detrtic origin, and is brought in winter, when valeus of mineral seston are very high. In the sping time, phytoplancton blooms, do not make up for lack of detritic material where as in the summer, oceanic phytoplancton is composed of important amounts of carbohydrates. Available food is defined as sum of protids, lipids and carbohydrates and mesured in energetic therms. This allows to foretell the amount of food that molluscs ar likely to assimilate.
Tipo: Text Palavras-chave: Marennes Oléron; Nutrition; Matière organique; Crassostrea gigas; Huîtres.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/acte-3003.pdf
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Dynamique des matières en suspension en mer cotière : caractérisation, quantification et interactions sédiments/matière organique ArchiMer
Chapalain, Marion.
The knowledge of suspended particulate matter (SPM) and turbidity dynamics in coastal waters is essential for studying marine ecosystems. Flocculation/deflocculation processes are crucial mechanisms controlling the dynamics of SPM physical characteristics and thus, the fate of these SPM in the environment. This PhD thesis focuses on the SPM characteristics and their dynamics in coastal waters, from tidal to annual scales, in response to hydrodynamic, hydrological and biological forcing that take place at the interface between estuaries and coastal seas. To this end, optical and acoustic sensors were deployed in situ through 6 field campaigns in 2016, in order to characterize and quantify SPM in the water column, near the mouth of the Seine estuary...
Tipo: Text Palavras-chave: Matière en suspension (MES); Floculation; Matière organique; Distribution en classe de taille; Dimension fractale; Capteurs optiques et acoustiques; Baie de Seine; Suspended particulate matter (SPM); Flocculation; Organic matter; Particle size distribution; Fractal dimension; Optical and acoustic sensors; Seine Bay.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00500/61155/64591.pdf
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Dynamique et réponse fonctionnelle des foraminifères et de la macrofaune benthiques en zone ostréicole dans les pertuis charentais ArchiMer
Bouchet, Vincent.
In oyster farming areas, organic matter fluxes toward sediment is increased. Pacific oysters (Crassostrea gigas) reject organic-rich faeces and pseudofaeces as a result of filtration process. Organic matter can be consumed by benthic fauna, but in excess it can entails the reduction of benthic faunal species richness, abundance and biomass. Organic matter degradation also induces hypoxic (or anoxic) conditions in the sediment, and production of ammonia and sulfides in toxic concentrations. The main objective of this study is to assess the effects of oyster farming on benthic intertidal ecosystems in the Pertuis Charentais. Benthic macrofauna, living (stained) foraminifera, and physicochemical characteristics of the water column and sediment were used as...
Tipo: Text Palavras-chave: CAT scan; Bioturbation; Macrofauna/foraminifera interaction; Sensible species; Tolerant species; Benthic foraminifera; Benthic macrofauna; Chlorophyl a; Organic matter; Intertidal areas; Pertuis charentais; Oyster farming; CAT scan; Bioturbation; Interaction macrofaune/foraminifères; Espèces sensibles; Espèces tolérantes; Foraminifères benthiques; Macrofaune benthique; Chlorophylle a; Matière organique; Zone intertidale; Pertuis charentais; Ostréiculture.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-2582.pdf
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Essai de détermination d'une typologie des sédiments côtiers en fonction de l'apparition d'eaux colorées ArchiMer
Arzul, Genevieve; Youenou, A.; Derrien, Annick; Gentien, Patrick; Crassous, M.p.; Lunven, M..
The study of different chemical parameters characterizing the coastal sediment, showed a possible relation between, respectively, high levels in organic matter and total copper, and the "red tide"  phenomenon.
Tipo: Text Palavras-chave: Sédiment côtier; Eaux colorées; Matière organique; Cuivre; Coastal sediment; Red time; Organic matter; Copper.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00425/53708/54565.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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Etude des sources d'alimentation potentielles des larves de l'huître perlière à l'échelle d'un lagon des Tuamotu, Ahe (Polynésie Française) ArchiMer
Mazzella, Audrey.
This work is part of a general study aiming at the modelling growth and dispersion of the larvae of Pinctada margaritifera in the lagoon of Ahe atoll (Tuamotu, French Polynesia). The general objective of this study is to set up a model coupling the growth and the dispersal of chlorophyll and particulate matter according to different spatial and temporal scales. Totally 1111 samples were taken in 12 stations from April 21st to May 28th, 2007. The speed and the direction of the wind bad a significant effect on the different parameters. The depth has not influence on the variations of the chlorophyll and the particulate matter that of their quality descriptors (proportion of cells lower than 2 µm, that of the phaeopigments and the organic matter). A...
Tipo: Text Palavras-chave: Ahe; Collectage; Temporel; Spatial; Chlorophylle; Phéopigments; Matières en suspension; Matière minérale; Matière organique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00426/53794/54709.pdf
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Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. I. Azote et populations bactériennes en fonction de certains paramètres du milieu ArchiMer
Chamroux, S.; Boucher, G..
Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters al­lowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of or­ganic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of...
Tipo: Text Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf
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Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. II. Effets de la matière organique circulante sur la méiofaune de systèmes polytrophes ArchiMer
Boucher, G..
Chemical and Biological evolution of sediments in closed circuit : II. Effect of soluble organic matter input on meiofauna in poly­trophic systems. The effect on meiofauna of the input of soluble organic matter in clo­sed circuit sand filters was followed during two years for an oligotrophic, a mesotrophic and an eutrophic tank, and during one year for an atrophic tank. In the case of no input, the density, biomass and species richness of nematodes decreases even if equitability remains constant. Oligotrophy main­tains the stability and diversity. Mesotrophy changes the community composition by species succession. Eutrophy allows biomass increase, due to one dominant species.
Tipo: Text Palavras-chave: Circuit clos; Matière organique; Meiofaune; Closed circuit; Organic matter; Meiofauna.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00305/41653/40862.pdf
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Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus ArchiMer
Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf
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La biodéposition des moules, Mytilus edulis, dans le Pertuis Breton : influence du cycle de marée et impact spatial ArchiMer
Kerambrun, Elodie.
La biodéposition liée à l'exploitation des filières de moules est responsable de l' accumulation de particules fines dans l'environnement marin. Cette biodéposition consiste, à travers la formation de feces et de pseudo feces, en un transfert de particules sestoniques, de la tranche d'eau vers le sédiment. Au cours de ce travail nous avons étudié l'influence des cycles de marée et de l'intensité de celle-ci sur la biodéposition, à travers la mesure de flux verticaux de particules. De même, l'impact de cette biodéposition (aspects qualitatifs et quantitatifs) sur le seston a été abordé. Notre étude montre une variation de l'intensité des flux liée au cycle de marée. Les flux les plus importants sont mesurés lorsque les courants sont les plus intenses,...
Tipo: Text Palavras-chave: Mollusques; Feces; Pseudofeces; Matière organique; Seston; Biodéposition.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00446/55740/57392.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 matière organique particulaire dans les eaux du bassin de Marennes-Oléron et de ses marais adjacents (claires) : conséquences pour la nutrition de l'huître Crassostrea gigas ArchiMer
Heral, Maurice; Zanette, Yvan; Deslous-paoli, Jean-marc; Robert, Jean-michel; Razet, Daniel.
In 1979 and 1980, the characteristics of the particulate organic matter are defined fortnightly through seston analyses. It is very high in the basin and very low in the finishing ponds. The phytoplanktonic biomasses are maximal in May in the estuary, and in June-July in the finishing ponds, with chlorophyll contents 10 times higher than those monitored in the basin. Proteins are generally the main biochemical components found in both environments, with glucids accounting for 20 % and lipids for only 10 % of the biochemical components on average. The C/N ratios are almost constant in the finishing ponds with values around 5, typical of phytoplankton, whereas they are very high in the basin except in spring. In the same way, the protid/chlorophyll and the...
Tipo: Text Palavras-chave: Crassostrea gigas; Huîtres; Mollusques; Qualité eau; Seston; Matière organique; Claires ostréicoles; Bassin Marennes Oléron.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/acte-6213.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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Matière organique et pollution par les hydrocarbures dans les sédiments superficiels du golfe d'Arzew (mer Méditerranée, Algérie) ArchiMer
Buscail, R; Foudil-bouras, Ae; Pauc, H.
The distribution of global organic parameters (organic carbon, nitrogen, hydrolyzable carbon) was established in surficial sediments of the Gulf of Arzew. Moreover, humic substances, humin and hydrocarbons have provided information on the organic matter origin and evolution in the identified sedimentary areas: prodeltas at the mouth of the dry rivers Cheliff and Macta; muddy mid-deposits and carbonated shallow environments. The higher organic matter concentrations characterize the muddy mid-deposits and especially the western part located near the Arzew and Bethioua harbours (TOC > 0.9 %; Nt = 0.35 % d.w.). The marine origin of the organic matter is supported by low C/N ratios (5-9) in the total sediments and the position in the Van Krevelen diagram of...
Tipo: Text Palavras-chave: Sédiment; Matière organique; Substance humique; Hydrocarbure; Marge algérienne; Sediment; Organic matter; Humic substance; Hydrocarbon; Algerian margin.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43612/43914.pdf
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Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997-1998 El Nino ArchiMer
Neira, C; Sellanes, J; Soto, A; Gutierrez, D; Gallardo, Va.
Quantitative surveys of metazoan meiofauna were carried out in an upwelling region off Central Chile (36 degreesS). During May 1997 and May 1998, coinciding with the onset and end of Fl Nino, five benthic stations (respectively 27, 34, 64, 88, and 120 m depth), from the middle of Concepcion Bay to the edge of the adjacent continental shelf, were sampled. The sedimentary organic matter biopolymeric fraction (proteins, carbohydrates and lipids) and chloroplastic pigments were also assessed. Total meiofauna abundance and biomass increased significantly between sampling dates at the mid-bay and inner shelf sites, from 1474 +/- 354 to 5035 +/- 291 individuals 10 cm(-2) and from 2618 +/- 332 to 5241 +/- 903 individuals 10 cm(-2), respectively. The relative...
Tipo: Text Palavras-chave: Chili central; El Niño; Méiofaune; Matière organique; Thioploca; Central Chile; El Nino; Meiofauna; Organic matter; Thioploca.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43358/42857.pdf
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Minéralisation de la matière organique et échanges ioniques à l'interface eau-sédiment de l'étang de Berre, Méditerranée ArchiMer
Delmas, Daniel.
The étang de Berre, near Marseilles (France), is an inland brackish basin with a high primary rate of production. In 1966, the diversion of the Durance River introduced important hydrological changes. A study of organic matter mineralization and ionie exchanges at the water-sediment interface has made it possible to distinguish two areas, according to the composition of organic matter, mineralization mechanism and ionie transfers. In the North, the high rate of mineral sedimentation leads to a low content of organic matter in the sediment. This organic matter of detrital origin is little affected by mineralization; there is, however, high production of ammonium nitrogen, which is released to overlying waters. Nitrates and nitrites undergo denitrification...
Tipo: Text Palavras-chave: Interface eau-sédiment; Matière organique; Eau interstitielle; Minèralisation; Milieu saumâtre; Water-sediment interface; Organic matter; Lnterstitial water; Mineralization; Brackish basin.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00122/23317/21142.pdf
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Modélisation mathématique de l'oxygène dissous dans l'estuaire de la Loire. Première phase ArchiMer
Thouvenin, Benedicte; Romana, Louis-alexandre.
Depuis plusieurs années, on observe en période post-estivale un très important déficit en oxygène dissous dans l'estuaire de la Loire, accompagné par une mortalité élevée de certaines espèces halieutiques migratrices. L'origine de cette anoxie est imputée au stock de matière organique particulaire biodégradable qui est piégée dans la zone de turbidité maximale. A la demande de l'Association pour la Protection de l'Environnement de l'Estuaire de la Loire, un modèle mathématique a été mis en place pour décrire les mécanismes hydrodynamiques et hydrosédimenraires dans l'estuaire, ainsi que l'évolution de l'oxygène dissous et la dégradation de la matière organique. Dans une première phase, ce modèle reproduit l'évolution longitudinale et temporelle de...
Tipo: Text Palavras-chave: Modèle mathématique; Estuaire; Loire; Oxygène dissous; Matière organique.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00439/55039/56471.pdf
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Origine, devenir et contrôle de la matière particulaire dans les élevages de poissons marins en système recyclé ArchiMer
Franco, Miguel.
The particulate matter plays an essential role in the functioning of recirculating aquaculture systems (RAS). Rich in organic substances, it provides ideal conditions for the bacterial development, which contribute to its mineralization. The understanding of interactions between the bio-geochemical cycles of carbon and nitrogen in these processes is necessary to define an effective and adapted management of aquaculture facilities. A methodology using natural stable isotopes (13C and 15N) and elemental carbon and nitrogen analysis on particulate matter, allows to identify its sources and to quantify its fluxes. Applying this methodology, we found an enrichment of 13C in dorsal muscle of reared fish and non differences of 13C in fish liver compared to the...
Tipo: Text Palavras-chave: Nitrogen; Carbon; Isotopes; Organic matter; Particulate matter; Dicentrarchus labrax; Seabass; Recirculating systems; Aquaculture; Azote; Carbone; Isotopes; Matière organique; Matière particulaire; Dicentrarchus labrax; Bar; Système de recirculation; Aquaculture.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/these-322.pdf
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Origine et devenir de la matière organique au sein du micro-estuaire temporaire de Fiume Santu (L’Agriate, Haute-Corse) ArchiMer
Massey, Jean-laurent.
In relation with meteorological, hydrological and topographic characteristics, Corsica has a very large number of temporarily open/closed micro-estuaries. Agriates contains several of them, including the Fiume Santu’s temporarily micro-estuary. These ecosystems are specific because of their sporadic connection with the sea. The opening and closure depends on both the river flow and the presence of the Posidonia oceanica (L.) Delile “banquettes”. Characterization of the global functioning was based on a multiparameter approach (particulate matter and dissolved inorganic matter descriptors, carbon and nitrogen stable isotope, phytoplankton communities), in order to qualify and quantify the organic matter (OM), along an estuary – coastal zone gradient. The OM...
Tipo: Text Palavras-chave: Corsica; Fiume Santu; Micro-estuaire temporaire; Matière organique; Isotopes stables; Nutriments; Phytoplancton; Corsica; Fiume Santu; Temporarily open/closed micro-estuary; Organic matter; Stable isotope; Nutrients; Phytoplankton.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38691/37188.pdf
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The shell organic content in the energy budget of Mytilus trossulus from the South Baltic ArchiMer
Wolowicz, Macciek; Goulletquer, Philippe.
La quantité de matière organique et sa valeur énergétique ont été évaluées pour les coquilles de Cerastoderma glaucum, Macoma balthica et Mytilus trossulus de la baie de Gdansk, par extraction chimique et microcalorimétrie. Le contenu moyen en matière organique varie de 0,54% chez C.glaucum, à 5,21 % chez M. balthica et 5,92% chez M. trossulus. La valeur énergétique de la matière organique de la coquille varie entre 15,15 (± 1.41) j .mg-1 chez M. balthica, 20,17 (± 1,60) j.mg-1 chez M. trossulus et 23,88 (± l ,56) j.mg-1 chez C. glaucum. Le contenu en matière organique de la coquille et sa valeur énergétique sont spécifiques, et corrélés avec la microdistribution géographique (facteurs de l'environnement) de la population, ou avec le type de sédiment. Des...
Tipo: Text Palavras-chave: Matière organique; Valeur énergétique; Coquille; Mytilus trossulus; Organic matter; Energy values; Shell; Mytilus trossulus.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00065/17594/15118.pdf
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