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| Registros recuperados: 26.605 | |
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| Bonhommeau, Sylvain; Blanke, Bruno; Treguier, Anne-marie; Grima, Nicolas; Rivot, Etienne; Vermard, Youen; Greiner, Eric; Le Pape, Olivier. |
| The migration duration of European eel (Anguilla anguilla) larvae (leptocephali) from the spawning areas in the Sargasso Sea to the European continental shelf remains highly controversial, with estimates varying from 6 months to more than 2 yr. We estimated the fastest migration period and the shortest distance travelled by eel larvae by simulating Lagrangian particles released in the Sargasso Sea and by simulating a range of larval behaviours (fixed-depth drift, vertical diurnal migration and active-depth selection to maximize current velocity). This enabled us to compute (i) a passive drift speed, and (ii) a hypothetic swimming speed needed for European eel larvae to cross the Atlantic in 6 months (i.e., the migration duration estimated from otolith... |
| Tipo: Text |
Palavras-chave: Sargasso Sea; Migration duration; Leptocephali; Lagrangian modelling; Gulf Stream; Fractals; Anguilla. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6865.pdf |
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| Tachikawa, K.; Vidal, L.; Cornuault, M.; Garcia, M.; Pothin, A.; Sonzogni, C.; Bard, E.; Menot, G.; Revel, M.. |
| Holocene eastern Mediterranean Sea sediments contain an organic-rich sapropel S1 layer that was formed in oxygen-depleted waters. The spatial distribution of this layer revealed that during S1 deposition, deep waters were anoxic below a depth of 1800 m. However, whether this boundary permanently existed from the early to the mid-Holocene has not been examined yet. To answer this question, a multi-proxy approach was applied to a core retrieved close to the 1800 m boundary (at 1780 m). We measured the bulk sediment elemental composition, the stable isotopic composition of the planktonic foraminifer Globigerinoides ruber and the abundance of benthic foraminifera since the last deglaciation. The result indicates that authigenic U and Mo accumulation began... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00291/40252/38634.pdf |
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| ISTPM Nantes. |
| I -Etude expérimentale de l'influence d'élevage intensif de truite arc en ciel sur la concentration en trois germes tests (CT, SF, CF) dans les huîtres. II -Etude bibliographique des germes hôtes normaux du milieu marin susceptibles d'être pathogènes pour l'homme. III -Etude bibliographique des conséquences possibles de l'usage d'antibiotiques à proximité des zones conchylicoles. |
| Tipo: Text |
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| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/00060/17163/14665.pdf |
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| Petitgas, Pierre. |
| Protocol established during the 2005 and 2006 Pelgas campaigns, for anchovy eggs in the Bay of Biscay. The density column used is Coombs' (1981). Egg density varies according to surface hydrological conditions (Petitgas et al., 2006), which necessitates a routine measurement of egg density according to a set protocol. |
| Tipo: Text |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-6434.pdf |
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| Garcia, F. |
| Counting annual rings on shells, under favourable climatological conditions, usually permits determination of the age of many bivalves. But the application of this method becomes impossible when meteorological conditions are highly variable, as in the Bay of Fos. Annual winter rings are, in fact, often merged with other rings induced by important physiological processes like gametogenesis. When, therefore, annual rings and pseudoannual rings occur, it is impossible to distinguish between them. SEM offers a good solution to this problem, through the establishment of a scheme of interpretation. This method would also be suitable to identify the two main types of rings that could be confused in Ruditapes decussatus L. of the Bay of Fos, using optic microscopy... |
| Tipo: Text |
Palavras-chave: EUROPEAN CARPET CLAM; GROWTH RINGS; VONBERTALANFFY GROWTH MODEL; OPTIC AND ELECTRONIC MICROSCOPY; MEDITERRANEAN SEA. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21135/18755.pdf |
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| Millet, C.; De Monts, M. C.. |
| Les produits naturels présentant une activité biologique et dérivés des mondes animal et végétal ont, de tout temps, reçu attention pour leur valeur bio-médicale. Dans cette démarche, qui remonte à la plus haute antiquité, l'empirisme, la constatation fortuite, la curiosité expérimentale et la systématisation du screening pharmacologique ont successivement jalonné la route du besoin, c'est-à-dire le maintien de la santé, en produisant d'abord des extraits ou isolats naturels, support des médications, puis le modèle original, point de départ à l'élaboration synthétique du composé bio-actif. Si le perfectionnement des techniques de chimie analytique permet aujourd'hui, à partir d'un modèle de base, la restructuration diversifiée des molécules, leur... |
| Tipo: Text |
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| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/00105/21635/19215.pdf |
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| Arnaud, Christophe; Fillon, Alain. |
| The Charente-Maritime coast has, on its northern part, between the Charente estuary and the northern boundary of the department (Isle of Ré included), many sites which interest the oyster culture industry, especially as far as juvenile collection is concerned. The well-known centre of Fouras is one of them. To help the professionals, and for its own purposes, the Ifremer studies the periods of emission of cupped oyster larvae in order to let the oyster farmers know about the best collection times. Contractualized for the first time in 1996 between the SRC FIE-Centre Ouest and the Ifremer, this work has been carried out again in 1997 by the DEL coastal laboratory of La Rochelle, following the renewal of this contract. This report presents the different... |
| Tipo: Text |
Palavras-chave: Captage; Marennes Oléron; Crassostrea gigas; Larves; Reproduction. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/rapport-6568.PDF |
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| Di Lorenzo, E.; Schneider, N.; Cobb, K. M.; Franks, P. J. S.; Chhak, K.; Miller, A. J.; Mcwilliams, J. C.; Bograd, S. J.; Arango, H.; Curchitser, E.; Powell, T. M.; Riviere, Pascal. |
| Decadal fluctuations in salinity, nutrients, chlorophyll, a variety of zooplankton taxa, and fish stocks in the Northeast Pacific are often poorly correlated with the most widely-used index of large- scale climate variability in the region - the Pacific Decadal Oscillation (PDO). We define a new pattern of climate change, the North Pacific Gyre Oscillation (NPGO) and show that its variability is significantly correlated with previously unexplained fluctuations of salinity, nutrients and chlorophyll. Fluctuations in the NPGO are driven by regional and basin-scale variations in wind-driven upwelling and horizontal advection - the fundamental processes controlling salinity and nutrient concentrations. Nutrient fluctuations drive concomitant changes in... |
| Tipo: Text |
Palavras-chave: North Pacific Ocean climate; Salinity and nutrient variability; Upwelling and ecosystems. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00483/59492/62351.pdf |
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| Thiriot, Alain. |
| La campagne Cineca-Charcot 1 a été organisée par le Centre Océanologique de Bretagne en collaboration avec des chercheurs de plusieurs laboratoires français et étrangers à la demande du Centre National pour l'Exploitation des Océans, comme première participation française au programme international CINECA "Cooperative Investigations of the Northern part of the Eastern CentraL AtLantic". Cette région est le siège de phénomènes saisonniers de remontée d'eau subsuperficielle riche en sels nutritifs entraînant une intensification locale des processus de production aux différents niveaux de la chaîne alimentaire. Les chercheurs du Centre Océanologique de Bretagne s'intéressent essentiellement aux premiers échelons animaux du domaine pélagique et ont fait appel... |
| Tipo: Text |
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| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/00306/41757/40968.pdf |
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| Le Lay, Matthieu; Galle, Sylvie. |
| West African rainfall is characterized by a strong variability, both at decadal and interannual scales. In order to quantify the hydrological impacts of such a variability, analysis of rainfall patterns at fine scales is highly essential. This diagnostic study aims to characterize the Sudanese rainfall regime at hydrological scales, using a raingauge data set collected on the upper Oueme River catchment (Benin) between 1950 and 2002. A long-term drought is observed during the 1970s and 1980s, as in the Sahel. However, the interannual variability remains significant in the Sudanese region. The study of the seasonal cycle, based on the distinction between the oceanic and continental monsoon regimes, shows that the majority of rainfall changes occur in the... |
| Tipo: Text |
Palavras-chave: Catchment; Sudanese climate; Rainfall deficit; Monsoon; Precipitation; West Africa. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00203/31460/30115.pdf |
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| De Kergariou, Gabriel. |
| A traditional activity on the Breton coast, spider crab fishing has grown more important over the past few years, not due to an increase of the number of catches but to a significant decrease in the number of lobsters and crayfishes brought to the market, following the closing of some fishing areas (Anglo-Norman Isles, Ireland, England) and the exhaustion of others. |
| Tipo: Text |
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| Ano: 1971 |
URL: http://archimer.ifremer.fr/doc/1971/publication-6664.pdf |
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| De Vernal, A; Hillaire-marcel, C; Peltier, Wr; Weaver, Aj. |
| During the Last Glacial Maximum, the northwestern North Atlantic constituted a major conduit for Labrador and Greenland ice sheet meltwaters. Vertical density gradients in its upper water masses have been reconstructed by combining information from transfer functions based on dinocysts and from oxygen isotope measurements (delta(18)O) in planktonic foraminifera. Transfer functions yield temperature and salinity and thus potential density (sigma(theta)) for the warmest (August) and coldest (February) months in the photic zone. The delta(18)O values in different size fractions of epipelagic (Globigerina bulloides) and mesopelagic (Neogloboquadrina pachyderma left-coiled (Np1)) foraminifera allow us to assess sigma(theta) gradients through the pycnocline... |
| Tipo: Text |
Palavras-chave: Last Glacial Maximum; LGM; North Atlantic; Salinity; Density; Pycnocline. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00223/33405/31861.pdf |
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| Registros recuperados: 26.605 | |
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