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| Registros recuperados: 8,733 | |
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| Peruzzi, Stefano; Chatain, Beatrice. |
| The optimal conditions for the retention of the second polar body in sea bass eggs were investigated by altering the timing, intensity and duration of application of pressure and cold shocks. Treatment optima for cold shocks were 0-1 degrees C for 15-20 min at 5 min after fertilisation (a.f.) and 8500 psi for 2 min at 6 min a.f. for pressure shocks. Meiogenesis was obtained by fertilising eggs with UV-irradiated homologous sperm (32,000 erg mm(-2)) and pressure or cold shocking eggs as above. 100% triploidy was induced following definition of liable periods for the disruption of the meiotic spindle obtained in gynogenesis. Ploidy investigations were performed on experimental groups by flow-cytometry. Verification of uniparental transmission in meiogens was... |
| Tipo: Text |
Palavras-chave: Parental variability; Pressure and cold shocks; Dicentrarchus labrax; Sea bass; Triploidy; Meiotic gynogenesis. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-507.pdf |
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| 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 |
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| Dupuy, Christine; Vaquer, André; Lam Hoai, Thong; Rougier, Claude; Mazouni, Nabila; Lautier, Jacques; Collos, Yves; Le Gall, Solange. |
| The Mediterranean Thau Lagoon is an important oyster farming area in Europe. Oyster growth rates are among the highest in France, although chlorophyll a concentration is low. Previous studies have demonstrated that picophytoplankton, nano-microphytoplankton, dinoflagellates and loricate ciliates such as tintinnids are abundant. However, heterotrophic flagellates and aloricate ciliates have not been investigated. The aim of this study was to assess picophytoplankton, protist and zooplankton abundances in the Lagoon and to investigate the particular structure of the microbial food web, which may explain such paradoxical oyster growth. In oligotrophic waters in the Thau Lagoon, the picoeukaryote Ostreococcus tauri is the dominant autotrophic picoplankter,... |
| Tipo: Text |
Palavras-chave: Trophic link; Picophytoplankton; Heterotrophic protist; Microbial food web; Thau Lagoon; Food source; Oyster; Bivalve. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-812.pdf |
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| Morales-nin, B; Cannizzaro, L; Massuti, E; Potoschi, A; Andaloro, F. |
| The Mediterranean small-scale fleet is highly adaptive, showing a dynamic fishing intensity and strategy, and exploiting seasonal abundant resources. In this area, the aggregatory behaviour under floats of juvenile fish has been used since ancient times to exploit oceanic migratory species such as dolphinfish (Coryphaena hippurus), using Fish Aggregating anchored Devices (fads). A total of 2 300 boats are engaged in this fishery from August to December, the main fishing areas being those around Malta, Tunisia, Sicily and Majorca. The fads ( arrow right m2) are made of different cheap floating materials, and are moored in fixed places, ranging from shore waters to areas 60 miles off the coast (1 500 m depth). Each boat deploys an average of 20 to 100 fads.... |
| Tipo: Text |
Palavras-chave: Artisanal fishing; Attracting techniques; Fishery development; Tuna fisheries; Coryphaena hippurus; Naucrates ductor; Seriola dumerili; Article Geographic Terms: MED. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00042/15286/12672.pdf |
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| Mitta, Guillaume; Vandenbulcke, Franck; Noel, Thierry; Romestand, Bernard; Beauvillain, Jean Claude; Salzet, Michel; Roch, Philippe. |
| In previous papers, we characterised 3 types of 4-kDa, cysteine-rich, cationic antimicrobial peptides: MGDs (for Mytilus galloprovincialis defensins), mytilins and myticins, which are abundant in the mussel hemocytes. In the present work, me revealed a differential distribution of the cells expressing the different genes. In addition, using confocal and electron microscopy, we confirmed that defensins and mytilins were partially located in different sub-types of circulating hemocytes although the peptides can be located in the same cell, and even in the same granule. We also demonstrated that mytilins exert their microbicidal effect within the cells through the process of phagosome-mytilin granule fusion leading to the co-location of ingested bacteria and... |
| Tipo: Text |
Palavras-chave: Innate immunity; Hemocyte; Mussel; Myticin; Mytilin; Defensin; Antimicrobial. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-413.pdf |
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| Sajus, Marie-celine. |
| Marteilia refringens est un protozoaire parasite de l'huître plate Ostrea edulis, à l'origine de mortalités dramatiques en élevage depuis les années 1970. En zone endémique, le seul moyen de contrôle de la marteiliose, est une gestion du risque de contamination. Dans ce cadre, la connaissance du cycle parasitaire de Marteilia refringens est primordiale. Les travaux réalisés à ce sujet ont permis de poser l'hypothèse d'un cycle hétéroxène. Le parasite a été détecté par PCR puis localisé au sein des tissus par hybridation in situ au sein d'une espèce de copépode Calanoide prélevée dans une claire ostréicole. A ce stade, cette espèces peut être considéré comme un hôte de Marteilia refringens. Notre étude consistait à mettre en évidence la dynamique des... |
| Tipo: Text |
Palavras-chave: Marteilia refringens; Parasitologie; Huître plate; Ostrea edulis; Eau de mer; Zooplancton; Claires ostréicoles. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00032/14351/11635.pdf |
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| Robert, Stephane; Razet, Daniel; Goulletquer, Philippe; Soletchnik, Patrick; Geairon, Philippe; Le Moine, Olivier; Faury, Nicole; Mineur, Frederic; Seugnet, Jean-luc. |
| L'aménagement du fleuve Charente constitue un enjeu particulièrement important tant au niveau des activités de la bande côtière que pour le bassin versant. Au niveau du littoral charentais, et en particulier pour la conchyliculture, le fleuve Charente représente le principal apport d'eaux douces, et donc d 'éléments nutritifs, essentiels au développement de la production primaire et des larves d'huîtres. Ainsi, les apports d'eau douce sont importants pour le développement du phytoplancton (printemps, été, automne), le développement des larves d'huîtres en période estivale qui requiert une dessalure, et la qualité des huîtres en fin d'année. Les suivis des caractéristiques de la Charente sont par conséquent particulièrement importants et ont déjà fait... |
| Tipo: Text |
Palavras-chave: Salinité; Température; Evolution temporelle; Estuaire; Paramètres hydrologiques; Charente; Bassin de Marennes Oléron. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00072/18363/15935.pdf |
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| Claireaux, Guy; Webber, D; Lagardere, Jean-paul; Kerr, S. |
| Environmental influences (temperature and oxygenation) on cod metabolism and their impact on the ecology of this species were investigated. Limiting oxygen concentration curves (O-2 level ranging between 15 and 100% air saturation) were established at 2, 5 and 10 degreesC. The standard metabolic rate (SMR), the maximum metabolic rate and the metabolic score were then modelled as functions of temperature and/or oxygen saturation. The mean SMR at 2, 5 and 10 degreesC were 19.8 +/- 4.9, 30.8 +/- 6.1 and 54.3 +/- 4.1 mg O-2 h(-1) kg(-1). respectively. Between 2 and 5 degreesC, the active metabolic rate of cod almost doubled from 65 to 120 mg O-2 h(-1) kg(-1), to reach 177 mg O-2 h(-1) kg(-1) at 10 degreesC. In terms of metabolic scope (MS), the temperature... |
| Tipo: Text |
Palavras-chave: Oxygen; Temperature; Physiological ecology; Metabolism; Atlantic cod. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-428.pdf |
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| Bel Hassen, Malika; Prou, Jean. |
| Cette étude s'inscrit dans le cadre du programme expérimental de réhabilitation des fossés à poisson initié au CREAA (1997-2000). Ce programme répond à une demande régionale pour la valorisation des fossés à poissons. Cet écosystème fait partie du patrimoine régional et marque surtout son identité culturelle, une volonté locale a été manifestée pour sa conservation et valorisation. Cependant l'aménagement de ces structures s'avère très coûteux, le grossissement de poissons, essentiellement l'anguille, a été prévu afin de justifier les frais d'aménagement. Par ailleurs, l'élevage extensif de poisson s'accompagne de la pratique d'autres activités telle que l'agriculture ou l'élevage. La cohabitation de ces différents types d' activités peut déstabiliser le... |
| Tipo: Text |
Palavras-chave: Cartographie; Paramètre physico-chimique; Paramètres hydrologiques; Macrophystes; Halophytes; Taxonomie; Répartition géographique. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00086/19767/17409.pdf |
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| Lorance, Pascal; Latrouite, Daniel; Seret, Bernard. |
| Forty one manned submersible dives were carried out during 2 cruises in the Bay of Biscay covering a range of depth from about 100 to 2100 m. Chondrichthyan species were observed in most of the dives, some of them were easily identified and their behaviour could be studied. Twenty-two chondrichthyan species (9 sharks, 8 rays and 5 chimaeras) were recorded. Shark species were always seen active except Scyliorhinus canicula and Galeus melastomus. Some representatives were found motionless on the bottom, sometimes forming groups for the first species. Chimaeras appeared to strongly react to the presence of the submersible. The density of chondrichtyes and their relative frequency in the total fish assemblage were estimated, the results are globally consistent... |
| Tipo: Text |
Palavras-chave: Submersible; Deep Sea; Bay of Biscay; ANE; Chondrichthyans. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/acte-2571.pdf |
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| Baud, Jean-pierre; Palvadeau, Hubert; Nourry, Max; Penisson, Christian; Haure, Joel. |
| Dans le cadre d'un programme de prospection, mené par la Direction Départementale de l'Agriculture de la Vendée, des forages exploratoires, réalisés en divers point du littoral de la baie de Bourgneuf, ont mis à jour une quantité importante d'eau salée souterraine tant sur l'île de Noirmoutier que sur le continent (Bresson, 1982). |
| Tipo: Text |
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| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00304/41499/40707.pdf |
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| Registros recuperados: 8,733 | |
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