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Registros recuperados: 19
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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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Apports et distribution des résidus organochlorés à haut poids moléculaire dans la rade de Brest (milieu marin semi-fermé) ArchiMer
Marchand, Michel; Caprais, Jean-claude; Cossonmannevy, Ma; Moriniere, P.
The aim of this work is to study the input, transfer and distribution processes of chlorinated insecticides (lindane, DDT) and PCB residues in a semi-closed coastal marine environment. Measurements are made in sea water, rain water and sediment samples. Distribution coefficients between sea water and sediment are determined for several organochlorine insecticide and PCB compounds. The results show an important transfer of chlorinated residues from the atmosphere to the marine environment. The highest residue levels in the sediments are observed near other urban and industrial pollution sources. Analyses of mussels show that this mollusc can be used as a biological indicator of sea water pollution. Concentration factors are determined for lindane,...
Tipo: Text Palavras-chave: Organochlorés; Eau; Sédiments; Matière vivante; Rade de Brest; Organochlorine; Water; Sediments; Biota; Rade de Brest.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00114/22481/20162.pdf
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Bilan 1984-1985 des études "Eaux colorées". Compte-rendu de réunion des 21 et 22 janvier 1986 ArchiMer
Arzul, Genevieve.
Les études entreprises sur le thème "Eaux colorées" durant les années 1984-1985 ont montré des résultats divers : - les essais de cultures de Dinophysis acuminata et de Gyrodinium aureolum ont donné des résultats fragmentaires tout en permettant de dégager quelques points positifs, mais les essais de mise en culture n'ont pas encore abouti. - les études hydrologiques à long terme pour la surveillance d'apparition de Gyrodinium aureolum en Baie de Douarnenez, Dinophysis acuminata dans un bassin du Havre et en Baie de Vilaine sont en voie d'achèvement. Y sont adjointes les observations faites sur les échantillons prélevés à Plogoff et Ploumoguer en 1978-80. - l'extraction des toxines de Gyrodinium aureolum, la standardisation du test souris pour le DSP,...
Tipo: Text Palavras-chave: Eaux colorées; Dinophysis acuminata; Gyrodinium aureolum; Phyto-toxines; Sédiments.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00139/25020/23125.pdf
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Critères de pollution par hydrocarbures dans les sédiments marins. Étude appliquée à la pollution du "Bohlen" ArchiMer
Marchand, Michel; Roucache, J.
In October 16, 1976, the tanker "Bohlen" was wrecked in the Mer d'Iroise, at about 35 miles of Brest, and lossed about 7 000 t of Boscan crude oil. The coast of Brittany was polluted by 3 000 t, and 4000 t were dispersed in the marine environment. In July 1977, 23 surface sediment samples were collected to look for the traces of oil spill in the sea bottom, 9 months after the shipwreck. Only one sediment was very iittle polluted by the Boscan crude oil. Elsewhere, two other kinds of oil pollution were observed in sorne sediment samples. Severa! quantitative and qualitative criteria were used to research sorne oil pollution in the marine sediments and to know the origin: hydrocarbon concentrations, ratios total organic extra ct 1 organic carbon,...
Tipo: Text Palavras-chave: Pollution; Hydrocarbures; Sédiments; « Bohlen »; Pollution; Hydrocarbons; Sediments; "Bohlen".
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00121/23206/21051.pdf
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Dénombrement des Escherichia coli dans des sédiments de la baie de l'Aiguillon ArchiMer
Derrien, Annick.
Le rôle des sédiments dans la contamination du milieu marin en baie de l'Aiguillon est une des problématiques du laboratoire. Pendant quinze mois des dénombrements d'Escherichia coli dans des sédiments de la baie ont été effectués. Deux méthodes de numération ont été comparées: la technique NPP en tubes et la technique NPP en microplaque. En période printemps-été, la méthode NPP miniaturisée a conduit à des résultats sensiblement supérieurs à ceux obtenus par la méthode NPP en tubes. Cette différence pourrait s'expliquer par une fluorescence parasite du sédiment pendant cette période (éventuellement par du plancton; hypothèse non confirmée). Les concentrations en E.coli des sédiments sont variables au cours de l'année avec un niveau de contamination faible...
Tipo: Text Palavras-chave: Sédiments; Escherichia coli; Dénombrement.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00107/21811/19386.pdf
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Diagnostic étendu de l'eutrophisation (DIETE). Rôle des sédiments dans le cycle des nutriments et impacts sur l'eutrophisation de la baie de Vilaine (2014-2017) ArchiMer
Souchu, Philippe; Cochennec-laureau, Nathalie; Ratmaya, Widya; Retho, Michael; Andrieux, Francoise; Le Merrer, Yoann; Barille, Laurent; Barille, Anne-laure; Goubert, Evelyne; Plus, Martin; Laverman, Anniet.
Le projet DIETE a exploré les données hydrobiologiques (paramètres physico-chimiques, nutriments, phytoplancton) acquises depuis les années 80 dans les eaux côtières au large de la Loire et de la Vilaine, parallèlement à celles des deux fleuves. L’augmentation des concentrations de nitrates dans les eaux de la Loire, appuyée par les réserves sédimentaires de phosphates et de silicate ont entraîné de profonds bouleversements dans la dynamique du phytoplancton de la baie de Vilaine ces deux dernières décennies avec 1) une augmentation substantielle de la biomasse, 2) une modification importante de l’évolution saisonnière, 3) un changement dans les proportions entre diatomées et dinoflagellés au profit des diatomées. Ces résultats ouvrent tout un champ...
Tipo: Text Palavras-chave: Eutophisation; Azote; Phosphore; Silicium; Sédiments; Modélisation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00425/53695/54593.pdf
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Distribution of Cd and Hg in the Bay of Marennes-Oléron ArchiMer
Gonzalez, Jean-louis; Boutier, Bernard; Chiffoleau, Jean-francois; Auger, Dominique; Noel, Joelle; Truquet, Isabelle.
The study of Cd and Hg distribution in the sediments, water and suspended matter of the Bay of Marennes-Oléron provided the opportunity to identify the factors governing the distribution of these two contaminants throughout the bay. On one hand, these elements are associated with the continental inputs from the Charente river which settle on arrivaI at the mouth of the estuary and in the eastern part of the bay. The Cd and Hg present in these deposits are associated with POC, as weIl as with Mn and Fe oxides and hydroxides. On the other hand, a portion of the dissolved inputs is recycled in the bay waters through phytoplankton activity. This mechanism contributes, particularly in the case of Cd, to increased particulate metal fluxes from the water column...
Tipo: Text Palavras-chave: Baie de Marennes-Oléron; Métaux lourds; Sédiments; MES; Activité phytoplanctonique; BAY OF MARENNES-OLERON; HEAVY METALS; SEDIMENTS; SUSPENDED MATTER; PHYTOPLANKTON ACTIVITY.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00085/19604/17242.pdf
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Dynamique des matières en suspensions minérales des eaux de surface de la Manche observée par satellite et modélisée numériquement. ArchiMer
Rivier, Aurelie.
Study of mineral suspended particulate matter (SPM) is essential to understand ecosystem dynamics. SPM influences light penetration which is closely related to primary production and carries pollutants and nutrients within the water masses. This work aims to study near-surface mineral SPM dynamics in the English Channel using two complementary methods: remote-sensing by satellites and numerical modelling. Firstly, MODIS and MERIS satellite images processed by the IFREMER semi-analytical algorithm and describing non-algal SPM, are analysed to build three statistical models which are able to estimate near-surface SPM using simple variables, e.g., tidal coefficient, significant wave height and mean chlorophyll-a concentration. Secondly, the three-dimensional...
Tipo: Text Palavras-chave: Matière en suspension; Télédétection; Satellite; Modélisation; Manche; Sédiments; Turbidité; Marée; Houle; Suspended particulate matter; Satellite; Remote-sensing; Modelling; English Channel; Sediments; Turbidity; Tide; Wave.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26783/24884.pdf
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Holocene coastal changes and infilling of the La Perroche marsh (French Atlantic coast) ArchiMer
Clave, B; Masse, L; Carbonel, P; Tastet, Jp.
The La Perroche marsh is a small Holocene marsh on the south-western coast of the Oleron island (Bay of Biscay, France) presently occupied by a freshwater swamp and separated from the ocean by a continuous sand dune ridge. The study of its infill shows first basal conglomeratic deposits with calcareous pebbles on a Cenomanian rough substrate. The Holocene infill since 6000 years BP begins with a very fast sedimentation of sands. Then, the sedimentation becomes finer, with lagoonal to freshwater influences recorded by ostracods. The distribution of these deposits inside the marsh is asymmetric, with a thick sandy-gravely layer in the eastern part and a succession of sands, clays and organic layers in the western part. Communication with the sea is episodic,...
Tipo: Text Palavras-chave: Changements côtiers; Marais maritime; Holocène; Ostracodes; Sédiments; Coastal changes; Coastal salt marsh; Holocene; Ostracods; Sediments.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43349/42877.pdf
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Impact des installations ostréicoles sur l’hydrodynamique et la dynamique sédimentaire ArchiMer
Kervella, Youen.
Oyster farm structures represent artificial obstacles which can disturb tidal currents and wave propagation, and thus modify sediment transport patterns. Local deposition may result from these modifications, in proportions that may threaten the oyster farming. The impact of structures on hydrodynamics, waves and currents, is investigated at different spatial scales by means of in-situ measurements, experimental tests and numerical modeling. These different approaches show that in the near-field, tidal currents are modified in terms of intensity and direction but there is no significant impact on the waves. On the other hand, at the scale of the oyster farm, a significant reduction of the current velocities and a large wave height attenuation are recorded....
Tipo: Text Palavras-chave: Tables à huîtres; Envasement; Courants; Vagues; Sédiments; Impact; Oyster tables; Silting up; Currents; Waves; Sediment; Impact.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12262/9043.pdf
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Improvements in Digestion Protocols for Trace Element and Isotope Determinations in Stream and Lake Sediment Reference Materials (JSd-1, JSd-2, JSd-3, JLk-1 and LKSD-1) ArchiMer
Revillon, Sidonie; Hureau Mazaudier, Daniele.
Total dissolution is a critical step in geochemical analysis. Despite the number of published protocols, this issue still draws attention for sediment samples, which are particularly difficult to dissolve due to the common occurrence and high abundance of refractory phases such as zircon. We present tests of different chemical digestion procedures carried out on reference materials (RM) of stream (JSd-1, JSd-2 and JSd-3) and lake (JLk-1 and LKSD-1) sediments from the Geological Survey of Japan (GSJ) and the Canadian Certified Reference Material Programme (CCRPM). We demonstrate that the fusion technique is not appropriate for our studies as not all elements of interest were recovered and blank levels were too high to permit further Sr and Pb isotopic...
Tipo: Text Palavras-chave: Sediments; Fusion; Dissolution acide; HR ICP MS; Materiel de reference; Sediment; Fusion; Acid digestion; HR ICP MS; RM; Sédiments; Fusion; Dissolution acide; HR ICP MS; Matériel de référence.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6840.pdf
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Lithologie des délestages glaciaires (niveaux de Heinrich) de l'Eperon de Goban (Atlantique Nord-Est) ArchiMer
Van Rooij, David.
Goban Spur is a marginal plateau, 250 km SW of Ireland, with the Celtic Margin on its eastern side and Porcupine Seabight Basin on its northern side. A set of NNE-SSW trending escarpments separate the upper part of Goban Spur from the Porcupine Abyssal Plain. We have studied a transect of Kullenberg cores taken during the 1984 Norestlante 2 campaign. Biostratigraphical and sedimentological (carbonate content) analyses were carried out by Müller [1986] and Foucault [1987]. All cores were accurately cleaned and described before digital photographs were taken in order to obtain grey level profiles and an estimate of the coarse grain size fraction (> 150 µm). Magnetic susceptibility and gamma density measurements were obtained using a GEOTEK Multi Sensor...
Tipo: Text Palavras-chave: Goban Spur; Quaternaire; Sédiments; Délestages glaciaires; IRD; Turbidites; Niveau de Heinrich; Calotte glaciaire.; Goban Spur; Quaternary; Sediments; IRD; Turbidites; Heinrich Layer; Heinrich Event; Ice Sheet..
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00412/52317/53096.pdf
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Microbial activity at the deep water sediment boundary layer in two highly productive systems in the Western Mediterranean: the Almeria-Oran front and the Malaga upwelling ArchiMer
Bianchi, A; Calafat, A; De Wit, R; Garcin, J; Tholosan, O; Cacho, I; Canals, M; Fabres, J; Grout, H; Masque, P; Sanchez-cabeza, Ja; Sempere, R.
Microbiological and biogeochemical studies were carried out in sediments and near bottom waters in the upwelling area off the Malaga coast and in the Almeria-Oran frontal zone. In these nutrient-rich conditions, metabolic activity is potentially limited by oxygen availability through the sediment depth. In the surficial sediments of the frontal zone, however, oxygen penetrated to a depth of 4 cm, allowing oxic mineralisation processes to occur throughout the layer. In the surficial sediments of the upwelling area, oxygen penetration was limited to the top 2.5 cm, leading to anoxic conditions. Glutamate respiration and global oxygen uptake rates were clearly higher than in the frontal zone. In the superficial sediments of the frontal zone, bacteria were...
Tipo: Text Palavras-chave: Taux de minéralisation; Sédiments; Eaux profondes; Méditerranée occidentale; Bacteria; Mineralisation rate; Sediments; Deep-sea; Western Mediterranean.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43298/43034.pdf
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Nouvelle méthode de dosage de quelques métaux - traces dans les sédiments et les matières en suspension ArchiMer
Chiffoleau, Jean-francois; Truquet, Isabelle.
Des matières solides séchées sont minéralisées en bombe fermée par un mélange d'acide nitrique, d'acide chlorhydrique et d'acide fluorhydrique à environ 120 °C pendant 180 minutes. Cette attaque acide est totale et le minéralisat liquide obtenu est analysé pour sa teneur en métaux par absorption atomique avec ou sans flamme. C'est une méthode très sensible puisqu'elle permet de détecter dans des particules jusqu'à 0,35 % d'Al; 0,15 % de Fe, 0,1 mg/kg de Cd, 2 mg/kg de Co, 0,4 mg/kg de Cr, 2 mg/kg de Cu, 0,4 mg/kg de Mn, 2 mg/kg de Ni, 2 mg/kg de Pb, 0,1 mg/kg de Zn. La précision de cette méthode, sa reproductibilité ( de l'ordre de 7 % ) et sa facilité de mise en oeuvre en font une méthode de choix pour l'étude de faibles de quantité d'échantillons, comme...
Tipo: Text Palavras-chave: Analyse; Métaux-traces; Sédiments; Matières en suspension; Absorption atomique.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00140/25119/23228.pdf
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Observations préliminaires recueillies dans l'exécution des programmes entrepris par la station biologique de Roscoff ArchiMer
Bergerard, S..
We have tried to expose here the first observations on the basis of , previous knowledge and studies in progress when the wreck arrived, in particulary of benthic Populations Dynamics by the workers of the Biological Station. These results, still very fragmentary, allow never the less to definite the programs required for the second phase, essentially on the populations of fine deposits of the Morlaix and Lannion bays.
Tipo: Text Palavras-chave: Pollution; Hydrocarbures; Amoco Cadiz; Sédiments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Baie de Morlaix; Baie de Lannion; Pollution; Hydrocarbons; Amoco Cadiz; Sediments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Morlaix Bay; Lannion Bay.
Ano: 1978 URL: http://archimer.ifremer.fr/doc/00306/41725/40936.pdf
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Rapport de synthèse de la campagne d'évaluation de la qualité chimique des sédiments (ROCCHSED) 2013 du littoral du bassin Seine-Normandie ArchiMer
Menet-nedelec, Florence; Chiffoleau, Jean-francois; Grouhel-pellouin, Anne.
Ce rapport présente les résultats de l’évaluation de la qualité chimique des sédiments sur le littoral du bassin Seine-Normandie, obtenus lors de la campagne ROCCHSED (Réseau d’Observation de la Contamination CHimique du littoral) effectuée en juin 2013. Après un rappel des méthodes appliquées, une caractérisation de sa teneur en carbonates, granulométrie et matière organique est décrite, et l’évolution temporelle de la fraction fine des sédiments dans la baie de Seine orientale est mise en évidence. La distribution spatiale des contaminants le long du littoral normand en 2013 est interprétée par familles (métaux, substances organiques) et par secteur géographique. Une première tentative d’étude de l’évolution temporelle du niveau d’imprégnation en...
Tipo: Text Palavras-chave: ROCCH; Sédiments; Contaminants chimiques; Métaux; Substances organiques; DCE; OSPAR; Littoral normand; Bassin Seine-Normandie..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00458/56928/58780.pdf
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Réseau de surveillance benthique – Région Bretagne. Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Trégor-Goëlo ArchiMer
Ehrhold, Axel; Chevalier, Claire; Alix, Anne-sophie; Autret, Elodie; Caisey, Xavier; Drussel, Benjamin; Gaffet, Jean-dominique; Hamon, Dominique; Houlgatte, Eric; Pluquet, Fabrice; Biscara, Laurie; Choisnet, Justine; Bajjouk, Touria.
In 2000 Ifremer launched and coordinated the development of a monitoring strategy for the REBENT network (REseau BENThique) in order to assess the aftermath of the “Erika” oil spill which took place in December 1999. Its aim is to provide consistent baseline knowledge on coastal benthic habitats, as well as to develop a monitoring tool that detects changes at various spatial and temporal scales. Sector-based seabed habitat mapping in shallow water (< 50 m deep), is currently being conducted throughout Brittany's coastal waters using a combination of geoacoustic marine systems together with ground-truthing using biological grab sampling and seabed observations. Due to the extended area, the overlap of soft and rocky bottoms, and contrasting hydrological...
Tipo: Text Palavras-chave: Rebent; Trégor-Goëlo; Bréhat; Cartographie d’habitats; Sonar latéral; Macrofaune benthique; Peuplements; Crépidule; Maërl; Sédiments; Morphologie; Dynamique sédimentaire; Rebent; Trégor-Goëlo; Bréhat archipelago; Marine habitat mapping; Sidescan sonar; Benthic macrofauna; Communities; Crepidula bed; Maerl; Sediment; Morphology; Bedload transpor.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00280/39161/37724.pdf
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RNO. Surveillance du Milieu Marin. Travaux du Réseau National d'Observation de la qualité du milieu marin. Edition 1999 ArchiMer
Ifremer.
Tipo: Text Palavras-chave: Méthyl-mercure; TBT; Organoétains; Sédiments; Mollusques; Milieu marin; Contamination chimique.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00314/42564/41934.pdf
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Sulfate-reducing bacteria [rom mangrove swamps II : Their ecology and physiology ArchiMer
Bharathi, Pal; Oak, S; Chandramohan, D.
Sulfate-reducing bacteria (SRB) have been enumerated and physiologically characterized in three mangrove stations along the Zuari estuary. The substrates for counting were lactate, acetate, propionate, butyrate and benzoate. Benzoate oxidizing SRB were widespread and occurred in numbers up to 6.62 x 10(3)/g dry sediment. The next highest in number were lactate utilizing SRB. On an average there were more propionate and butyrate utilizers than acetate utilizers. While Agasaim at the mouth of the estuary harboured highest number of lactate oxidizers, none were detected at Mirabaug upstream during the samplings. The SRB shared many characteristics with Desulfovibrio desulfuricans, D. desulfuricans aestuarii, D. salexigens, Desulfotomaculum orientis, D....
Tipo: Text Palavras-chave: Bactéries; Sulfato-réductrices; Estuaire; Sédiments; Mangrove; Mangrove-Bacteria; Sulfate-reducers; Estuary; Sediments.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00323/43395/43103.pdf
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