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Registros recuperados: 9
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Application de modèles dynamiques bayésiens aux séries temporelles de Dinophysis à Antifer (Normandie, France) ArchiMer
Soudant, Dominique.
Le Dinophysis est une microalgue toxique à l’origine d’epidémies diarrhéiques. En dépit de nombreuses études, l’écologie et la biologie de ce genre phytoplanctonique restent mal connues. Afin de déterminer les conditions d’apparition de Dinophysis cf. acuminata sur le site d’Antifer (Normandie, France), des prélèvements d’eau de mer ont été effectués quasi-journellement pendant les périodes estivales des années 1987 à 1993. Les séries temporelles résultantes concernent la concentration de la microalgue et les facteurs chimiques, physiques et météorologiques. L’analyse de ces données à l’aide d’outils sta- tistiques classiques (e.g. régression) s’est avérée difficile (e.g. instabilité temporelle des résultats). Une caractéristique commune de ces méthodes...
Tipo: Text Palavras-chave: Modélisation; Statistique; Dynamique; Séries temporelles; Bayésien; Dinophysis; Baie de Seine.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00015/12576/9446.pdf
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Dynamique des pêcheries traditionnelles d'anchois, de calmars et de poulpes du Sud-Ouest de Madagascar : utilisation d'outils océanographiques pour la gestion des ressources ArchiMer
Bemiasa, John.
Anchovy (Stolephorus indicus), squid (Loligo sp.) and octopus (Octopus cyanea) are among the main exploited halieutic resources in the south western region of Madagascar. Important year to year changes of their abundance (e.g. anchovy) could have drastic consequences on catches as well as for the economy of the local communities. Yearly environmental changes analysis on enrichment process in upwelling area (Chl-a), sea surface temperature, winds permitted to explain annual and seasonal variability of anchovy, squid and octopus abundance index as well as their seasonal reproduction strategy. Seasonally environmental cycle is taken in account by species for their reproduction strategy development. Results from this study show the first idea of factors and...
Tipo: Text Palavras-chave: Ressources halieutiques; Gestion; Facteur climatique; Upwelling; Environnement; Dynamique; Pêche traditionnelle; Octopus cyanea; Loligo sp.; Stolephorus indicus.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6847.pdf
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Dynamique des populations bactériennes au cours de deux productions expérimentales de phytoplancton marin naturel ArchiMer
Bianchi, M.a.; Martin, Y.p..
Quantitative and qualitative variations of the hetero­trophic bacterial population, during two experimental induced phytoplanktonic blooms are described. When the phytoplanktonic population deceases, the bacte­rial population exhibits a significant increase. The spring microflore is quite different from the fall ones. Microbiological, physiological and biochemical fluctuations indicate qualitative fluctuations. Bacterial strains are identified as "bacterial profiles".
Tipo: Text Palavras-chave: Plancton; Bactéries; Dynamique; Physiologie; Structure; Plankton; Bacteria; Dynamic; Physiology; Structure.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00305/41669/40878.pdf
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Estimation des stocks de bivalves en élevage et des épibiontes dans la lagune de Thau et modélisation de la dynamique des populations d'huîtres creuses (Crassostrea gigas, Thunberg) ArchiMer
Gangnery, Aline.
In Thau Iagoon (Mediterranean Sea), shellfish are cultured in suspension. Molluscs are reared on ropes that are suspended on frames. Principal species concerned by breeding are Crassostrea gigas, Mytilus galloprovincialis and, in a less extent, Ostrea edulis. A new sampling method was developped to assess the total stock of cultured shellfish and was tested in July 1998 and April 1999. The total stock was found to be 19500 tons (± 1120 SE) in 1998 and 14100 tons (± 830 SE) in 1999, thus exhibiting temporal variations. Temporal differences in the total stock are mainly attributable to the breeding cycle but also to sorne exceptionnal events which occurred in Thau lageon in 1997 and 1998 (water anoxia, bacteriological crisis, bloom of toxic algae). In the...
Tipo: Text Palavras-chave: Etang de Thau; Bivalves; Echantillonnage; Dynamique; Modèle; Epibiontes.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00443/55478/57008.pdf
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Evolution à court terme des effectifs et de l'activité des communautés bactériennes dans des écosystèmes d'aquaculture ArchiMer
Bianchi, Armand J.; Bianchi, Micheline A..
SHORT-TERM VARIATION OF BACTERIAL COMMUNITIES CONCENTRATION AND ACTIVITY IN AQUACULTURE ECOSYSTEMS. Two kinds of short-term experiments were carried out on sea-water bacterial commun­ities of shrimp aquaculture in Polynesia at the Centre Océanologique du Pacifique (Tahiti). A 12 m3 sea-water tank was considered. The total number (AOC) and hétérotrophie activity of bacteria were studied during a 48 hours experiment with a 2 hours sampling time The total bacterial community was about 10? bacteria, and nitrifying bacteria were about 10 bacteria ml-1 and could showed doubling time of 7 hours. Several nitrogen sources were added in five liter flasks. With N-NH4 enrichment no great changes in activity and number could be seen. With organic nitrogen the number of...
Tipo: Text Palavras-chave: Dynamique; Numération; Activité; Communautés bactériennes; Aquiculture.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00306/41744/40955.pdf
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Evolution inattendue des récifs à Posidonia oceanica dans le golfe de Saint-Florent (Corse) ArchiMer
Pergent-martini, Christine; Bonacorsi, Marina; Plantecoste, Dorian; Pergent, Gerard.
Tipo: Text Palavras-chave: Cartographie; Dynamique; Herbiers; Aménagements littoraux; Corse.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00185/29673/28045.pdf
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Experimental study of the Rhone plume. Part I: Physics and dynamics ArchiMer
Broche, P; Devenon, Jean-luc; Forget, P; De Maistre, Jc; Naudin, Jj; Cauwet, G.
The complicated dynamic processes occurring when fluvial waters mix with marine waters control the nature and the fluxes of materials exported tay rivers to the sea. Understanding these processes is of primary importance in evaluating budgets. In wide-open estuarine situations these processes take place under the influence of an intense turbulence induced by tides. Conversely, the Rhone waters spread into the Mediterranean Sea in the form of an easily distinguishable buoyant plume often extending far offshore from the mouth of the river. The aim of this study is to describe the dynamic and hydrological fields on the basis of eulerian VHF radar mapping of surface currents coupled with lagrangian in situ physical or geochemical measurements. This paper...
Tipo: Text Palavras-chave: Panache fluvial; Radar VHF; Rhône; Dynamique; River plume; VHF radar; Rhone; Dynamics.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43636/43229.pdf
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Première approche de la dynamique d'une population de Temora Longicornis O.F. Müler (Copepoda, Calanoida) dans les bassins à flot du port de Dunkerque (France) ArchiMer
Brylinski, Jm.
The wet docks of Dunkirk are 3 to 4 degrees Celcius warmer than the seaboard waters of the North Sea. Such warmth is due to thermic industrial was­te mainly from the E.D.F. power-station. A thermic and saline stratification can be observed that favours heterogeneousness among the populations of Temora lon- gicomis. The samples of copepods taken from the North Sea are significantly bigger than those found in the port of Dunkirk. Differences in size vary in the course of the year. The action of high temperatures upon reproduction is being debated j so is the existence of an autochtonous population in the docks in sum­mer.
Tipo: Text Palavras-chave: Temora longicornis; Milieu portuaire; Température; Biométrie; Dynamique; Temora longicornis; Harbour; Temperature; Biometry; Dynamic.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00305/41656/40865.pdf
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Rôle du rail équatorial dans la circulation méridienne océanique : interactions des échelles spatiales conduisant au mélange ArchiMer
Menesguen, Claire.
The large scale meridional overturning circulation in the ocean is maintained by a combination of several mechanisms. This dissertation focuses on turbulent equatorial mixing, one of the key mechanisms to balance heat forcing. The motivation for the research is observations of thin layers of well-mixed density and tracers distributed intermittently over the vertical that coincide with particular features of a larger scale pattern of equatorial jets. A large number of numerical experiments at moderately high resolution was performed in order to successfully replicate the observed equatorial dynamics, which involves both quasi-barotropic extra-equatorial jets and small vertical scale equatorial deep jets. The combination of the two systems of jets...
Tipo: Text Palavras-chave: Dynamics; Ocean; Shear instability; Inertial instability; Scales interaction; Mixing; Equator; Dynamique; Océan; Instabilité de cisaillement; Instabilité inertielle; Interaction d'échelles; Mélange; Équateur.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6463.pdf
Registros recuperados: 9
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