Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 54
Primeira ... 123 ... Última
Imagem não selecionada

Imprime registro no formato completo
Using geochronology to reconstruct the evolution of particulate phosphorus inputs during the past century in the Papeete Lagoon (French Polynesia) ArchiMer
Harris, Pierre; Fichez, Renaud; Fernandez, Jean Michel; Golterman, Han; Badie, Christian.
During the past century, the sediment deposition rate has been assessed by measuring excess Pb-210 activity in a sediment core sampled in the harbour area of the Papeete Lagoon (Tahiti, French Polynesia). Dated sediment samples were analysed following a sequential extraction method to quantify five sedimentary phosphorus pools: loosely sorbed or exchangeable phosphorus, ferric iron-bound phosphorus, authigenic calcium carbonate associated phosphorus, detrital apatite and detritic inorganic phosphorus, acid organic phosphorus. Results from sediment dating showed the core to cover the period from 1865 to 1995, with a sharp change around 1957 corresponding to a doubling in sediment deposition rates. From the bottom to the top of the core, concentrations...
Tipo: Text Palavras-chave: Géochronologie; Phosphore; Sédiment; Lagons coralliens; Geochronology; Phosphorus; Sediment; Coral reef lagoon.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43365/42850.pdf
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Water column and recent sediment data on diatoms and coccolithophorids, off Portugal, confirm sediment record of upwelling events ArchiMer
Abrantes, F; Moita, Mt.
Diatom and coccolithophorid abundance and diatom assemblage composition found in the water column along the Portuguese margin, during upwelling and non-upwelling conditions, are compared to the distribution patterns observed in the recent sediments from the same area. The water column results indicate a one order of magnitude increase in phytoplankton biomass during upwelling conditions (summer), with diatoms being the most important contributors. Coccolithophorids, on the contrary, dominate the phytoplankton in winter (non-upwelling), The comparison of the upwelling and non-upwelling spatial distribution of these phytoplankton groups to their sedimentary record reveals the sediment record as a reflection of the upwelling situation, preserving most of its...
Tipo: Text Palavras-chave: Upwelling; Portugal; Diatomée; Colonne d'eau; Sédiment; Upwelling; Portugal; Diatom; Water column; Sediment.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43630/43253.pdf
Imagem não selecionada

Imprime registro no formato completo
Campagne RNOSED 1998 - Analyse de la contamination des sédiments du littoral Nord / Pas-de-Calais / Picardie ArchiMer
Desombre, Julie; Lefebvre, Alain; Bucas, Karenn.
The National Network of Observation (RNO) of the IFREMER is a monitoring network of the quality of the marine environment. This report is interested in the results of series of measurement from the RNO sediment of 1998 and relates to the analysis of the contamination of the coastal sediments from the Belgian coastal zone to Fécamp. Measurements relate to heavy metals and the organic compounds the such Polyaromatic Hydrocarbons (HAP), Polychlorobiphényles (PCB) and pesticides (DDT, Lindane). A statistical processing is carried out starting from the standardized metal contents and of the organic rough contents in order to highlight possible regroupings of intake points per level of pollution. The origins of the contamination given thanks to an inventory of...
Tipo: Text Palavras-chave: Sédiment; RNO; Normalisation; Contaminants; Apports anthropiques; Sediment; RNO; Standardization; Contaminants; Anthropic fluxes.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00167/27821/26014.pdf
Imagem não selecionada

Imprime registro no formato completo
Contamination chimique des sédiments des lagunes méditerranéennes françaises - Bilan de la Campagne ROCCHSED 2017 ArchiMer
Grouhel, Anne; Chiffoleau, Jean-francois; Crochet, Sylvette; Ouisse, Vincent; Galgani, Francois; Munaron, Dominique.
le Réseau d’Observation de la Contamination Chimique (ROCCH) évalue la qualité chimique du milieu marin à partir des concentrations en contaminants mesurées dans la chair de mollusques et dans le compartiment superficiel fin des sédiments prélevés sur les fonds. La campagne ROCCHSED2017 est la 4ème campagne d’échantillonnage dans les lagunes méditerranéennes françaises. Elle a permis la mesure de concentrations en éléments traces métalliques et en contaminants organiques (sur la base des listes des réglementations en vigueur) dans les sédiments de 13 lagunes.
Tipo: Text Palavras-chave: Sédiment; Contaminant chimique; ROCCH; Azote; Phosphore.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00467/57885/60184.pdf
Imagem não selecionada

Imprime registro no formato completo
Effect of sediment nearness on the metabolic enzyme activity and energy state of the oyster Crassostrea gigas ArchiMer
Le Moullac, Gilles; Fleury, Pierre-gildas; Le Coz, Jean-rene; Moal, Jeanne; Samain, Jean-francois.
This study was designed to assess in situ the effects of sediment nearness on Crassostrea gigas metabolism. One year-old oysters were reared for 5 months (April-August) in plastic bags on metallic frames at 10 and 60 cm off the sediment at the beginning of April. The management of the energetic resources (storage, consumption) was estimated with respect to biochemical changes of proteins, lipids and carbohydrates. In order to evaluate the effect of the sediment nearness at cellular level, the metabolic rate was evaluated by assessing pyruvate kinase (PK) and phosphoenolpyruvate carboxykinase (PEPCK) enzyme activities and electron transport system (ETS) activity. The metabolic pathways were assessed by measuring ATP and intermediary metabolites such as...
Tipo: Text Palavras-chave: Aspartate; Succinate; Alanine; ETS; PEPCK; PK; Carbohydrate; Lipids; Proteins; Sediment; Oyster; Aspartate; Succinate; Alanine; ETS; PEPCK; PK; Glucides; Lipides; Proteines; Sédiment; Huître.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2803.pdf
Imagem não selecionada

Imprime registro no formato completo
Caractérisation des sédiments des fonds de bassin des différentes fermes aquacoles de Nouvelle- Calédonie : Compilation des fiches techniques publiées de 1998 à 2000 ArchiMer
Lemonnier, Hugues.
En 1996, le vieillissement des fonds de bassins aquacoles de crevettes était présenté comme hypothèse explicative de la dégradation des rendements de production sur certains sites d’élevage. Un travail conséquent avait été réalisé à l’époque dont l'objectif était, à partir d'un inventaire des différents sédiments des fermes aquacoles du Territoire, de mettre en évidence une éventuelle évolution de ce sédiment au fil des cycles d'élevage et son influence sur la productivité. L’objet de ce document est de numériser et de compiler les différentes fiches techniques diffusées à l’époque sous forme papier aux aquaculteurs de la filière crevette de Nouvelle-Calédonie.
Tipo: Text Palavras-chave: Aquaculture; Litopenaeus stylirostris; Durabilité; Sédiment; Envasement; Matière organique; PH; Déchets.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00656/76762/77918.pdf
Imagem não selecionada

Imprime registro no formato completo
Effet des biodépôts de l'huître Crassostrea gigas (Thunberg) sur l'accumulation de matières organiques dans les parcs du bassin de Marennes-Oléron ArchiMer
Sornin, Jean-marc; Feuillet, Michelle; Heral, Maurice; Deslous-paoli, Jean-marc.
The accumulation of biodeposits brings about geochemical modifications of the underlying sediment, that are noticeable. The increase can reach 83% of the amount of organic carbon. By catching the deposits on the spot and by gathering them directly from the oyster tables we get a daily deposit that can weigh, according to season, between 8 and 99 g of carbon a square meter. The recycling of important quantities of organic matter increase the oxygen needs and the most reducing environment provides opportunities for ammonification and reduction of sulfate into sulfur. So we can consider that there is as much as 4 times more sulfurous hydrogen in intensive oyster-growing areas. This output of sulfurs seems to cause the oyster filtration some damage (Ito et...
Tipo: Text Palavras-chave: Marennes Oleron; Sediment; Oysters; Physiology; Filtration; Biodeposits; Crassostrea gigas; Marennes Oléron; Sédiment; Huître; Physilogie; Filtration; Biodépôts; Crassostrea gigas.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-2955.pdf
Imagem não selecionada

Imprime registro no formato completo
Cycle de l'azote à l' interface eau-sédiment dans le Bassin d'Arcachon : rôle des bactéries dans les processus de perte en azote (nitrification-dénitrification) ArchiMer
Riou, Stéphane Alain.
Bacterial nitrification and denitrification were studied in the sediments of the Bassin d'Arcachon, a macrotidallagoon located in the Southwestern Atlantic French coast colonized by extensive Zostera noltii  meadows. Nitrifiers were enumerated by MPN method. Densities were law : from 102 to 104 bacteria per ml of sediment presenting an increase during winter. Nitrifying activities were measured by NH4+  accumulation N-serve block technique. Activities were ranged from 0 to 90 µmol m-2 h-1 and nitrification represented 120-140 mmol m-2 yr-1 for intertidal sediments. The 15N  isotope pairing technique was applied to sediment samples from the whole bay for determining the denitrification rates. Average rates were 10-20 µmol m·2 h-1 with a maximum of 75 µmol...
Tipo: Text Palavras-chave: Nitrification; Dénitrification; Sédiment; Zostera noltii; Lagune; NPP; N6SERVE; 15N; Nitrification; Denitrification; Sediment; Zostera noltii; Marine laboon; MPN; N-serve; 15N.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00443/55439/56959.pdf
Imagem não selecionada

Imprime registro no formato completo
Evaluation de l'état chimique DCE des masses d'eau littorales du bassin Seine-Normandie ArchiMer
Menet-nedelec, Florence; Grouhel-pellouin, Anne.
Ce rapport fait pour la première fois la synthèse de l’évaluation de l’Etat chimique des masses d’eau littorales du bassin Seine-Normandie. Cette évaluation a été réalisée dans le cadre de la mise à jour de l’Etat des Lieux 2019 pour la Directive Cadre sur l’Eau. A partir des données du Réseau d’Observation de la Contamination Chimique du littoral (ROCCH), les données ont été traitées selon le Guide relatif aux règles d’évaluation de l’état des eaux littorales dans le cadre de la DCE (2018). L’évaluation a pris en compte les substances obligatoires de ce guide, des substances complémentaires disposant d’un critère d’évaluation d’OSPAR dans les moules et dans le sédiment. Les résultats montrent que la baie de Seine reste contaminée par les PCB dans les...
Tipo: Text Palavras-chave: Etat des Lieux; Directive Cadre sur l’Eau (DCE); Etat chimique; ROCCH; Mollusques; Sédiment; Tendances..
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00611/72348/71246.pdf
Imagem não selecionada

Imprime registro no formato completo
Etude lithostratigraphique des carottes prélevées dans la zone d'immersion des déchets radioactifs de l'Atlantique nord est (zone aen). Intérêt pour la prévision des impacts ArchiMer
Kerbrat, Rene.
Divers pays de la C.E.E. ont procédé à l'immersion de déchets radioactifs de faible activité dans une zone de l'Atlantique Nord Est. Dans le cadre d'un programme de recherche et de surveillance mené dans un but d'évaluation de la zone, des carottes sédimentaires ont été prélevées. L'étude lithostratigraphique de ces carottes met en évidence des processus sédimentaires différenciés selon la topographie, en particulier l'existence de phénomènes gravitaires. L'enregistrement dans les carottes du climat passé, notamment de périodes d'intense dissolution des carbonates, apporte des éléments nouveaux pour un modèle prévisionnel d'évolution des déchets.
Tipo: Text Palavras-chave: Atlantique Nord Est; Déchets radioactifs; Sédiment; Pleistocène; Paléoclimat..
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00431/54304/58897.pdf
Imagem não selecionada

Imprime registro no formato completo
Etude comparative de la qualité du milieu de bassins aquacoles de crevettes et palourdes chez des éleveurs du marais Breton (Vendée, Loire Atlantique) ArchiMer
Gautier, Dominique.
Une étude du milieu de cinq bassins d'élevage a été menée du point de vue de la qualité de l'eau (température, salinité, oxygène dissous, pH, chlorophylle A, nutriments) et de la qualité du sédiment (matière organique, carbonate de calcium, épaisseur de vase organique, macrofaune dominante). La salinité, contrairement à la température, est fonction de la fréquence et du mode de renouvellement. Les variations nocturnes du pH de l'eau sont en relation avec celles de l'oxygène dissous qui sont elles-mêmes fonction de la concentration en chlorophylle a. La fluctuation du pH de la colonne d'eau differe selon les bassins. Elle peut être stable (autour de 8,1) ou très variable (entre 7,6 et 8,6), sans être toujours en relation avec la concentration en...
Tipo: Text Palavras-chave: Aquaculture; Marais salés; Penaeus japonicus; Ruditapes philippinarum; Qualité du milieu; Sédiment.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00425/53644/54481.pdf
Imagem não selecionada

Imprime registro no formato completo
Subseafloor archaeal communities: from the surface to a deep hot biosphere? ArchiMer
Roussel, Erwan.
The sub-seafloor biosphere may contain two thirds of Earth's total prokaryotic biomass. The large and active microbial populations buried in the sub-seafloor play a key role in global biogeochemical cycles. However, little is known about these prokaryotic communities. The depth limit of this sub-seafloor biosphere is still unreached, and elevated temperatures as well as insufficient energy sources are the likely factors limiting life at depth. Interestingly, archaeal communities with unknown physiologies and no cultured relatives seem to have a key role in deep marine sediments and hydrothermal ecosystems. As most deep biosphere microorganisms detected so far have been extremely resistant to cultivation, molecular approaches remain to date the most...
Tipo: Text Palavras-chave: Sediment; Hydrothermal system; Ultramafic; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Deep biosphere; Sédiment; Écosystème hydrothermal; Ultramafique; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Biosphère profonde.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-4630.pdf
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean) ArchiMer
Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf
Imagem não selecionada

Imprime registro no formato completo
Fascicule technique pour la mise en oeuvre du réseau de contrôle surveillance DCE "Contaminants Chimiques" ArchiMer
GTs DCE La Réunion et Mayotte "Contaminants chimiques".
Les travaux relatifs à la mise en œuvre de la DCE à La Réunion ont démarré au début des années 2000, avec la mise en place de 4 groupes de travail DCE experts dont les travaux ont été synthétisés au travers de 4 fascicules techniques définissant les conditions de mise en œuvre des différents suivis du réseau de contrôle de surveillance (RCS) DCE en milieu marin à la Réunion. Le groupe de travail "chimie" a bénéficié du soutien du CEDRE et du LPTC. Une première version du fascicule "Contaminants chimiques", a été produite en 2012 et validée au niveau national par les référents DCE (spécialistes de l’échantillonnage passif et coordinateurs "Contaminants Chimiques" de l'Ifremer, coordination nationale DCE milieu Marin, responsables projet Quadrige). Le Parc...
Tipo: Text Palavras-chave: DCE; La Réunion; Mayotte; Contrôle de surveillance; Contaminants chimiques; Echantillonneurs passifs; Sédiment; Biote.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00168/27914/66252.pdf
Imagem não selecionada

Imprime registro no formato completo
Coprostanol levels and organic enrichment in sediments of the Bilbao estuary (north of Spain) ArchiMer
Saiz-salinas, Ji; Gonzalez-oreja, Ja.
An assessment was made of the distribution of the faecal sterol coprostanol (COP) in sediments in the Bilbao estuary. Concentrations of COP ranged from 135.15 to 10.77 mu g g(-1) dry weight, from the inner to the open estuary, with a mean value of 51.43 mu g g(-1); the highest concentrations were found near the mouths of several tributaries flowing into the estuary. Comparisons with ether published values indicate that sediments from the Bilbao estuary are affected by sewage pollution in a similar degree to that reported for other estuaries in the world. Organic enrichment and anaerobic sediment conditions prevail in three-fourths of its watercourse bed. Since the spatial distribution of several organic sedimentary parameters could be clearly correlated...
Tipo: Text Palavras-chave: Estuaire de Bilbao; Coprostanol; Sédiment; Enrichissement organique; Pollution; Bilbao estuary; Coprostanol; Sediment; Organic enrichment; Sewage pollution.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00326/43689/43120.pdf
Imagem não selecionada

Imprime registro no formato completo
Caractéristiques mécaniques des vases et des biodépôts de Marennes-Oléron ArchiMer
LHF - Laboratoire d'Hydraulique de France; IFREMER - Laboratoire LABEIM La Tremblade.
L'objet de l'étude est l'exécution et l'interprétation d'essais sédimentologiques visant à mieux définir les caractéristiques mécaniques des vases et des biodépôts de Marennes-Oléron et à préciser les paramètres à introduire dans les lois d'érosion-dépôt. Les travaux de recherche présentés dans ce rapport s'intègrent dans le programme Charente-Marennes-Oléron, programme de recherche coordonnée pour l'analyse et la modélisation de l'écosystème du bassin de la Charente et de la zone littorale associée.
Tipo: Text Palavras-chave: Sédiment; Propriétés physiques; Propriétés chimiques; Vases; Vitesse de chute; Tassement; Analyses rhéologiques; Bassin de Marennes Oléron.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00135/24630/22658.pdf
Imagem não selecionada

Imprime registro no formato completo
Etude des vases et des biodépöts de Marennes-Oléron. Caractéristiques sédimentologiques ArchiMer
CREOCEAN; IFREMER, Laboratoire LABEIM La Tremblade.
La présente étude est réalisée afin de préciser les caractéristiques des sédiments du bassin de Marennes-Oléron.
Tipo: Text Palavras-chave: Sédiment; Vases; Caractéristiques; Teneur en eau; Carbonates; Matières organiques totales; Granulométrie; Bassin de Marennes Oléron.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00135/24631/22659.pdf
Imagem não selecionada

Imprime registro no formato completo
Modélisation des cycles de l'azote et du phosphore dans les sédiments d'une lagune soumise à une exploitation conchylicole ArchiMer
Chapelle, Annie; Mesnage, Valérie; Mazouni, Nabila; Deslous-paoli, Jean-marc; Picot, Bernadette.
A simulation of nitrogen and phosphorus exchanges for the sediment-water interface is presented, The aim of the sttudy is to understand the dynamic behaviour of an eutrophie coastal lagoon (Thau, France), ln situ experiments were performed to estimate the different pools of nitrogen and phosphorus in the water column and in the sediment. The diffusive fluxes between them were also estimated. A numerical mode1, simulating nitrogen and phosphorus cycles, was developed and calibrated with data recorded .at two seasons (winter and summer). This study leads to the conclusion that is necessary to know the different pools of nitrogen and phosphorus in order to estimate which fraction is bioavailable and the rate of nutrient exchange between sediment and water. It...
Tipo: Text Palavras-chave: Modèle; Phosphore; Azote; Sédiment; Ecosystème conchylicole; Modelling; Phosphorus; Nitrogen; Sediment; Shellfish ecosystem.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00039/15026/12360.pdf
Registros recuperados: 54
Primeira ... 123 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional