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| Registros recuperados: 26.605 | |
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| Mercier, Grégoire; Ardhuin, Fanny. |
| Spaceborne synthetic aperture radar (SAR) is well adapted to detect ocean pollution independently from daily or weather conditions. In fact, oil slicks have a specific impact on ocean wave spectra. Initial wave spectra may be characterized by three kinds of waves, namely big, medium, and small, which correspond physically to gravity and gravity-capillary waves. The increase of viscosity, due to the presence of oil damps gravity-capillary waves. This induces not only a damping of the backscattering to the sensor but also a damping of the energy of the wave spectra. Thus, local segmentation of wave spectra may be achieved by the segmentation of a multiscale decomposition of the original SAR image. In this paper, a semisupervised oil-slick detection is... |
| Tipo: Text |
Palavras-chave: Water pollution; Synthetic aperture radar; Sea surface; Satellite applications; Oil spill; Image analysis. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1948.pdf |
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| Rodrigues, T.; Voelker, A. H. L.; Grimalt, J. O.; Abrantes, F.; Naughton, F.. |
| Past sea surface water conditions of the western Iberian Margin were reconstructed based on biomarker analyses of a marine deep sea core MD03-2699 from the Estremadura Spur north off Lisbon, providing new insights into orbital and suborbital-scale climate variability between marine isotope stage (MIS) 15 to MIS 9 (580 to 300 ka). We use biomarker-based proxy records such as the alkenone unsaturated index to estimate sea surface temperature (SST), the total alkenone concentration to reconstruct phytoplankton productivity, and terrestrial biomarkers to evaluate the continental input. The results extend the existing biomarker record, namely the SST for the Iberian Margin, back to the sixth climatic cycle (580 ka). A general trend of stable interglacials... |
| Tipo: Text |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00228/33879/32246.pdf |
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| Piriou, Jean-yves; Duval, Valérie. |
| Laboratory experiments have been conducted in order to examine the grouth of ULVA SP. Results show that growth suddenly stops at a precise moment. Collectively, the results of simultaneously analysis of culture media constituents demonstrate that several components may alter the growth process of UIva sp. Based on the culture experiments, we argue that the gowth responses of UIva sp. are unaffected by pH or oxygen concentrations, but field plants of ULVA sp. are libely to be ponctually limited in growth by carbon (DIC) depletion, together with nitrogen limitation and pigments degradation. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00037/14824/12140.pdf |
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| Miramand, P; Bentley, D; Guary, Jc; Brylinski, Jm. |
| Cd and V were analyzed in planktonic species (zooplankton and diatoms), in flocks and in total seston (suspended materials) collected at eleven stations for seven sampling periods in the eastern area of the bay of Seine. Cd concentrations measured in planktonic species of the bay of Seine are identical to those measured in other oceanic areas, but V concentrations are generally higher. In the conditions of sampling, the role of both planktonic species and flocks in the horizontal fluxes of Cd and V in the bay of Seine appears not to be important (Cd) or negligible (V) compared to non-living materials (tripton). Nevertheless, this study should be continued in periods of diatom blooms. Flocks which present high Cd and V concentration probably have an... |
| Tipo: Text |
Palavras-chave: PLANKTON; CD; V; BAY OF SEINE. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21143/18762.pdf |
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| Maurin, Cl; Duclerc, J. |
| La pêche à la sardine des côtes françaises de la Méditerranée, naguère négligeable, apporte désormais une contribution importante à l'économie du pays. Elle connaît même certaines difficultés pour commercialiser sa production, lorsque celle-ci atteint comme ce fut le cas en 1966-67 un tonnage voisin de 20 000 tonnes. On pourrait donc croire que ses problèmes, pour ce qui est de la technique et du rendement, sont résolus et que seul se pose celui de l'écoulement. Or, il n'en est rien et c'est au moment même où elle pourrait sembler pléthorique qu'elle court le risque de péricliter et de retomber aux étiages d'avant 1960, ceci en raison d'une pratique désastreuse, la pêche aux explosifs, plus ou moins importée de pays voisins dont on sait pourtant qu'elle a... |
| Tipo: Text |
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| Ano: 1967 |
URL: http://archimer.ifremer.fr/doc/1967/publication-7273.pdf |
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| Salin, Karine; Villasevil, Eugenia M.; Anderson, Graeme J.; Selman, Colin; Chinopoulos, Christos; Metcalfe, Neil B.. |
| Mitochondrial efficiency is typically taken to represent an animal’s capacity to convert its resources into ATP. However, the term mitochondrial efficiency, as currently used in the literature, can be calculated as either the respiratory control ratio, RCR (ratio of mitochondrial respiration supporting ATP synthesis to that required to offset the proton leak) or as the amount of ATP generated per unit of oxygen consumed, ATP/O ratio. The question of how flexibility in mitochondrial energy properties (i.e. in rates of respiration to support ATP synthesis and offset proton leak, and in the rate of ATP synthesis) affects these indices of mitochondrial efficiency has tended to be overlooked. Furthermore, little is known of whether the RCR and ATP/O ratio vary... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00449/56014/57529.pdf |
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| Passerini, Delphine; Fecamp, Florian; Marchand, Laetitia; Kolypczuk, Laetitia; Bonnetot, Sandrine; Sinquin, Corinne; Verrez-bagnis, Veronique; Hervio Heath, Dominique; Colliec Jouault, Sylvia; Delbarre Ladrat, Christine. |
| In the marine environment, biofilm formation is an important lifestyle for microorganisms. A biofilm is comprised of cells embedded in an extracellular matrix that holds them close together and keeps the biofilm attached to the colonized surface. This predominant lifestyle and its main regulation pathway, namely quorum-sensing (QS), have been shown to induce specific bioactive metabolites. In this study, we investigated the biofilm formation by two marine bacteria belonging to the Vibrio species to discover potentially innovative bioactive compounds. We proposed a protocol to isolate biofilm extracts, to analyze their biochemical composition, and to compare them to planktonic cell extracts. Cells were grown attached to a plastic surface; extracts were... |
| Tipo: Text |
Palavras-chave: Vibrio; Biofilm; Polysaccharide; Quorum-sensing; Activity. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00592/70381/68461.pdf |
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| IFREMER. Système d'Informations Halieutiques.. |
| Ce document est réalisé dans le cadre du projet « Système d'Informations Halieutiques » (SIH) de l'Ifremer, qui constitue le réseau d'observation des ressources halieutiques et des usages associés. Ce projet s'inscrit dans la mission de service d'intérêt public de l'Ifremer consistant à « connaître, évaluer et mettre en valeur les ressources des océans et permettre leur exploitation durable ». Outre la collecte des données pertinentes permettant l'analyse du secteur des pêches, le SIH a en charge l'élaboration d'indicateurs sur les flottilles de pêche et leur restitution sous forme de synthèses aux différents acteurs de la filière pêche (depuis la recherche jusqu'aux professionnels et gestionnaires) et du grand public. Ces indicateurs intègrent... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00492/60381/63814.pdf |
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| Bregeon, L.; Chandor, M.; Njock, J. C.. |
| Dans l e cadre d 'un programme d' études visant à définir un état de référence de l' estuaire et de l'embouchure de la Gironde, il a été confié au Centre Régional d'Etudes Biologiques et Sociales ( C.R.E.B.S. ) la réalisation d 'une étude comportant l'étude de l'exploitation actuelle des ressources marines dans l'estuaire de la Gironde, c' est à dire entre le bec d'Ambès et la ligne Pointe de Grave - Royan et dans la zone littorale limitée à l'est par la ligne Pointe de Grave - Royan, au nord par le parallèle de Chassiron (Ile d' Oléron), au sud par le parallèle de Montalivet et à l' ouest par l'isobathe (- 25 rn); - la surveillance de la contamination chimique des coquillages (huîtres) vivant sur les gisements naturels situés sur les deux rives de la... |
| Tipo: Text |
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| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/00436/54787/56241.pdf |
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| Gooday, Andrew J.; Holzmann, Maria; Caulle, Clemence; Goineau, Aurelie; Jones, Daniel Ob; Kamenskaya, Olga; Simon-lledo, Erik; Weber, Alexandra A. -t.; Pawlowski, Jan. |
| We describe Aschemonella monile Gooday and Holzmann sp. nov. from the Clarion-Clipperton Zone (CCZ, abyssal eastern equatorial Pacific), a region characterized by commercially significant concentrations of polymetallic nodules. The new species is the most abundant xenophyophore (giant agglutinated foraminifera) in our main sampling area (12-14 degrees N; 116 degrees 30'-117 degrees 26'W). Additional specimens originate from the central CCZ, and from a third area, similar to 900 km NW of the main area, where A. monile numerically dominates the megabenthos in photographic surveys of the seafloor (average densities 1.54 individuals/m(2); peak densities > 3 individuals/m(2)). Aschemonella monile is much larger (>= 7 cm in length) than previously... |
| Tipo: Text |
Palavras-chave: Abyssal megafauna; Biodiversity; Clarion-Clipperton Zone; Deep-sea benthos; Deep-sea mining; Protist. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00435/54663/56099.pdf |
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| Registros recuperados: 26.605 | |
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