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Registros recuperados: 14
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Diversité et activité des communautés microbiennes dans des sédiments marins associés aux émissions de fluides froids ArchiMer
Lazar, Cassandre Sara.
A large portion of the greenhouse gas methane on Earth is trapped in marine sediments. However, little methane actually reaches the hydrsphere and the atmosphere, because it is efficiently consumed by anaerobic methane-oxidizing Archaea (ANME). This methane is mainly biogenic in marine sédiments, and is produced by methanogenic Archaea. Methane ascends from deep sources to the seabed, in cold seep sites of continental margins. In order to study microbial community diversity in cold seeps, and to determine geochemical factors that control these microbial communities, we compared four geochemically and geologically distinct sites. In this work, molecular tools (PCR, RT-PCR, DGGE, cloning) as well as genetic markers (16S rRNA, mcrA, dsrB) were employed, to...
Tipo: Text Palavras-chave: Diversité moléculaire; Archaea; Méthanogène; ANME; McrA; DsrB; DGGE; Volcan de boue; Pockmark; Saumures; Fluides froids; Méthane; Mer de Norvège; Mer Méditerranée; Sédiments.; Molecular diversity; Archaea; Methanogen; ANME; McrA; DsrB; DGGE; Mud volcano; Pockmark; Brines; Cold seep; Methane; Norwegian Sea; Mediterranean Sea; Sediments..
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00031/14250/11534.pdf
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Diversité ichtyologique en Méditerranée : patrons, modélisation et projections dans un contexte de réchauffement global ArchiMer
Ben Rais Lasram, Frida.
Due to its semi-enclosed shape, to its high species richness and high endemism levels and to its invasiveness, the Mediterranean Sea is one of the most particular and critical ecosystems of the world. The Mediterranean has been intensively studied since the Antiquity, yet foundations underlying fish diversity patterns have been overlooked. In this study, as a first step, we studied fish diversity patterns in the Mediterranean and their determinants. Towards this objective, we built the first comprehensive database on the spatial distributions of the 619 Mediterranean fish species. We then carried out spatial analyses in order to assess the relative contribution of historical and geometric contingencies as well as environmental influences in shaping fish...
Tipo: Text Palavras-chave: Niche modeling; Global warming; Climatic envelopes; Geometric constraints; Endemism; Exotic invasions; Mediterranean Sea; Modélisation des niches; Réchauffement global; Enveloppes climatiques; Contraintes géométriques; Endémisme; Invasions exotiques; Mer Méditerranée.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-7407.pdf
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Echanges côte-large à moyenne échelle au niveau de la pente continentale du Golfe du Lion. Processus et Modélisation ArchiMer
Andre, Gael.
Dynamics of water mass exchanges between the Gulf of Lions (GoL) and the open sea are driven by several physical processes, which influence circulation at several spacio-temporal scales. This study, based on a realistic modelling during two years, aims to bring a better knowledge of circulation and hydrodynamics processes occurring in the NW Mediterranean Sea and in the GoL. Firstly, the NW Mediterranean Basin circulation modelled during the year 2001 is compared with Sea Surface Temperature (SST) satellite measurements (AVHRR) and with the MEDATLAS climatology. These comparisons show a good agreement concerning surface patterns and seasonal variability of the large scale circulation. At lower scale, several processes influence circulation over the shelf...
Tipo: Text Palavras-chave: Instabilities; Meso scale variability; Slope current; Hydrodynamical modelling; Gulf of Lions; Mediterranean Sea; Instabilité; Variabilité méso échelle; Courant de pente; Modélisation hydrodynamique; Golfe du Lion; Mer Méditerranée.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3673.pdf
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Indices of bluefin tuna (Thunnus thynnus thynnus) abundance derived from sale records of French purse seine catches in the Mediterranean sea ArchiMer
Labelle, Marc; Hoch, Thierry; Liorzou, Bernard; Bigot, Jean-louis.
Sampling operations are not routinely conducted in France to monitor the landings of bluefin tuna caught by purse seiners in the Mediterranean. The length, weight and age frequencies of bluefin caught by this fleet are predicted based on sale records, length-at-age and weight-length relations, trends in fishing and natural mortality rates, and other ancillary data. The resulting length frequencies are more accurate than those predicted by Liorzou and Bigot (1992) using a simpler algorithm, and are spread more evenly across adjacent size classes. Catch-per-unil-effort (CPUE) was expressed as the numbers of age 2 bluefin caught per successful seine fishing trip in the Gulf of Lions fall fishery. CPUE indices were computed by several methods, and compared to...
Tipo: Text Palavras-chave: Thon rouge; Senne tournante; Prises-par-unité-d'effort; Indices d'abondance; Taux de croissance; Évaluation des stocks; Mer Méditerranée; Bluefin tuna; Purse seine; Catch-per-unit-effort; Abundance indices; Growth rates; Stock-assessment; Mediterranean sea.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00188/29880/28357.pdf
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Les risques sanitaires liés à la présence d'Ostreopsis ovata dans les eaux de baignade ou d'activités nautiques ArchiMer
Kermarec, Florence; Dor, Frederic; Armengaud, Alexis; Charlet, Francis; Kantin, Roger; Sauzade, Didier; De Haro, Luc.
An initial surveillance system of Ostreopsis ovata was set Lip along the Mediterranean coast in the summer of 2007. To Strengthen and adapt this system, we reviewed the information available for a health risk assessment of this monocellular species of algae that produces palytoxin and is increasingly observed in the Mediterranean Sea. Since 2002, this species has been reported to be responsible for many human cases of irritation, Cough, fever and respiratory problems in Europe. It is not Currently possible to determine if palytoxin causes these health effects, which follow aerosol inhalation. Ingestion of contaminated seafood may lead to very serious poisoning, but no such case has yet been described in Europe. A "dose-response' relation cannot be...
Tipo: Text Palavras-chave: Risk assessment; Mediterranean Sea; Marine toxins; Algae; Toxines flore et faune marines; Mer Méditerranée; Évaluation du risque; Algues.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6164.pdf
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Les sites méditerranéens. Ecologie pélagique et benthique. Rapport concernant les campagnes Ecolion 1 & 2 ArchiMer
Arzul, G; Panouse, M; Romana, A; Fiala, M; Razouls, S; De Bovee, F; Labat, J.p..
As part of its nuclear program, E.D.F. put the C.N.E.X.O. in charge of the ecological study of a list of sites that had been considered for the implantation of nuclear power plants on the Mediterranean coast: PORT-la-N0UVELLE South, PORT-la-NOUVELLE North and FLEURY-sur-AUDE. The aim of this study is to compare, from an ecological point of view, the different sites during critical periods of the annual cycle: summer and spring. This report summarises the results of the two campaigns (ECOLION l and II) conducted on the area located between the Cap d'Agde and the Cap Leucate, and including the three studied sites. The study analysed the physicochemical parameters and the primary and secondary pelagic productions, and includes a qualitative and quantitative...
Tipo: Text Palavras-chave: Ecology; Ecolion; Cruise; Mediterranean sea; Ecologie; Ecolion; Campagne océanographique; Mer Méditerranée.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/1982/rapport-3698.pdf
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METROC : évaluation des apports de contaminants chimiques de la métropole marseillaise au milieu marin ArchiMer
Jany, Cassandre; Zebracki, Mathilde.
METROC program (part of the MEDICIS program about study and fate of the chemical contamination in Western Mediterranean Sea) focuses on sources and wastes issued by large metropolis, with the agglomeration of Marseille as a pilot site. This report presents the results of a sampling campaign in rivers and urban discharges in Marseille and on different types of contaminants (metals, PAH, PCB and PBDE) in dissolved and particulate phases, in dry and rain periods. Results show that concentrations of pollutants are greater in Aygalades river (metals and organic contaminants) and in Emissaire 2, sewer overflows and torrents. From the results of the analysis and discharge given by the DEA, we estimated partially the flows of pollutants which show that the first...
Tipo: Text Palavras-chave: Mer Méditerranée; Littoral; Apports urbains; Marseille; Contamination chimique; Métaux; HAP; PCB; PBDE; Concentrations; Mediterranean Sea; Coast; Urban waste; Marseilles; Chemical contamination; Metals; PAH; PCB; PBDE; Concentration.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00116/22692/20431.pdf
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Nutrients and carbon budgets for the Gulf of Lion during the Moogli cruises ArchiMer
Durrieu De Madron, X; Denis, L; Diaz, F; Garcia, N; Guieu, C; Grenz, C; Loye-pilot, Md; Ludwig, W; Moutin, T; Raimbault, P; Ridame, C.
Shelf-slope exchanges and budgets of organic and inorganic nutrients are calculated for the Gulf of Lion continental margin in the northwestern Mediterranean. Computations are based on data from three seasonal marine surveys performed in March 1998, June 1998 and January 1999 in the framework of the French Programme National d'Environnement Cotier. A Land-Ocean Interactions in the Coastal Zone type box model is used to calculate the advective exchanges between the shelf and the adjacent open sea and to estimate the budgets of non-conservative elements (DIP, DIN, DOP, DON, DOC, POC, PON, POP). These budgets consider river discharges, urban sewage supply, atmospheric deposition, and fluxes at the water-sediment and shelf-slope interfaces. Uncertainties on...
Tipo: Text Palavras-chave: Mer Méditerranée; Echanges côte-large; Fonctionnement de l’écosystème; Cycle du carbone; Bilan de sels nutritifs; Mediterranean Sea; Shelf-slope exchanges; Ecosystem functioning; Carbon cycle; Nutrients budget.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00301/41236/40426.pdf
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Observations sur la Sardine des Açores et nouvelle contribution à l'étude du genre- ArchiMer
Letaconnoux, Robert.
Tipo: Text Palavras-chave: Acores; Clupeidae; Pisces; Sardina; Atlantic; Açores; Mer Méditerranée; Répartition géographique; Biométrie; Sardina.
Ano: 1954 URL: http://archimer.ifremer.fr/doc/1954/publication-2206.pdf
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Rapport de synthèse de la campagne d'évaluation de la qualité chimique de sédiments (ROCCHSED) 2016 en Méditerranée ArchiMer
Bouchoucha, Marc; Tomasino, Corinne; Brach-papa, Christophe.
En 2016, des prélèvements de de sédiments ont été réalisés sur 54 stations en mer réparties le long de la façade méditerranéenne française au cours de la campagne ROCCHSED 16. Les contaminants organiques et métalliques ont été analysés conformément aux directives réglementaires et aux objectifs de bassin. Les résultats sont fournis dans ce rapport .
Tipo: Text Palavras-chave: Contamination chimique; Sédiment; Mer Méditerranée; Chemical contamination; Sediment; Mediterranean sea.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00458/56961/58859.pdf
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Shallow rocky bottom benthic assemblages as calcium carbonate producers in the Alboran Sea (southwestern Mediterranean) ArchiMer
Cebrian, E; Ballesteros, E; Canals, M.
Zonation patterns and species composition of the different assemblages encountered along the bathymetric axis are considered in order to quantify the biomass and calcium carbonate content of communities thriving in rocky bottoms of La Herradura (southwestern Mediterranean) between 0 and 50 m depth. Algal biomass is lower but total biomass is slightly higher to values recorded in other Mediterranean areas due to the high biomass of suspension feeders. Since most of the animals and algae with high biomass have calcareous skeletons, the calcimass is rather high (1 100 to 2400 g . CaCO3.m(-2)) when compared to other temperate and Mediterranean sites. A tentative estimate of yearly carbonate production yields 1 000 g . CaCO3.m(-2).y(-1) for the rocky bottoms of...
Tipo: Text Palavras-chave: Carbonate; Fonds rocheux; Communautés benthiques; Production; Mer Méditerranée; Calcium carbonate; Rocky bottoms; Benthic assemblages; Production; Mediterranean Sea.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00324/43565/44062.pdf
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Standardization proposal for the mapping of Caulerpa taxifolia expansion in the Mediterranean sea ArchiMer
De Vaugelas, Jean; Meinesz, Alexandre; Antolic, Boris; Ballesteros, Enrique; Belsher, Thomas; Cassar, Nicolas; Ceccherelli, Giulia; Cinelli, Francesco; Cottalorda, Jean-michel; Orestano, Carla Fradà; Grau, Antoni; Jaklin, Andrej; Morucci, Carlo; Relini, Marco; Sandulli, Roberto; Span, Ante; Tripaldi, Giuseppe; Van Klaveren, Patrick; Zavodnik, Nevenka; Zuljevic, Ante.
Fourteen years after the first observation of Caulerpa taxifolia (Valh) C. Agardh in the northwestern Mediterranean Sea, this green alga of tropical origin is now present in five countries (Spain, France, Monaco, Italy and Croatia). By the end of 1997, more than 46 km(2), at depths of between 0 and 50 m, were found to be affected by this expansion. A standardization of the cartographic procedure is proposed here. Such a standardization is necessary to compare maps produced by various organizations from different countries. For a given independent station, it is based on the definition of three levels of colonization:Level I refers to a station where one or several colonies less than 100 m apart cover a total surface area inferior to 1000 m(2):Level II...
Tipo: Text Palavras-chave: Mediterranean Sea; Invasive species; Standardization; Caulerpa taxifolia; Cartography; Mer Méditerranée; Espèces envahissantes; Standardisation; Caulerpa taxifolia; Mediterranean Seacartographie.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-837.pdf
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Unusual Po-210/Pb-210 ratios in the surface water of the Gulf of Lions ArchiMer
Radakovitch, O; Cherry, Rd; Heyraud, M; Heussner, S.
Concentrations of Po-210 and Pb-210 have been measured in sea water collected in the Grand Rhone Canyon. Concentrations of Pb-210 are at similar levels to those found in other Mediterranean seawater samples, and are at the levels which would be expected in comparison with global sea water data. The same applies to the Po-210 concentrations in samples from below 100 m depth. Surface samples from above 100 m have Po-210 at levels rather higher than expected, and their Po-210/Pb-210 ratios are about 1 or more as compared with the usual open ocean ratio of about 0.5. These data can be interpreted as indicating another source of supply of Po-210 to the surface layer in addition to the normal atmospheric input. We suggest that an episodic advective particulate...
Tipo: Text Palavras-chave: Enlèvement; Mer Méditerranée; Bilan de radioélément; Temps de résidence; Scavenging; Mediterranean Sea; Radionuclide budget; Residence time.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43668/43202.pdf
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Vertical distributions of macroplankton and micronekton in the Ligurian and Tyrrhenian Seas (northwestern Mediterranean) ArchiMer
Andersen, V; Francois, F; Sardou, J; Picheral, M; Scotto, M; Nival, Paul.
Vertical distributions and diel migrations at nineteen stations located in the Ligurian and Tyrrhenian Seas (northwestem Mediterranean) are described in detail and compared for the main species of micronekton and macroplankton. Sampling was performed in April 1994 in the 0-700 m water column in most cases, down to 350, 450 or 550 m for the coastal or relatively shallow sites. Most of the twenty species showed similar distributions throughout the sampled area, either non-diel-migrating distributions such as the euphausiid Stylocheiron longicorne and the fish Cyclothone braueri, or clear diel-migrant behaviour (e.g. the siphonophore Chelophyes appendiculata and the euphausiid Euphausia krohni). Four species, the siphonophore Lensia conoidea, the pteropods...
Tipo: Text Palavras-chave: Distribution verticale; Macroplancton; Micronecton; Mer Méditerranée; Mer Tyrrhénienne; Vertical distribution; Macroplankton; Micronekton; Mediterranean Sea; Tyrrhenian Sea.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43650/43222.pdf
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