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| Registros recuperados: 148 | |
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| Jouanneau, J.-m.; Berger, P; Boutier, Bernard; Ewald, M; Fontugne, M; Heral, Maurice. |
| The PLACAR cruise, which took place after the first autumn floodings on the inner Aquitaine shelf, permitted to determine the outspread of solid and liquid inputs originating from the Gironde in superficial waters. In addition to the classical evaluations (S. ppt., P.O.C., nutritive salt) and S.E.M. observations, the researchers carried out detailed analyses of D.O.C., isotopic composition of P.O.C. delta super(13)C, dissolved fulvic acids and metals. |
| Tipo: Text |
Palavras-chave: Biscay Bay ANE; France Salts Salinity Water temperature Suspended organic matter Estuarine dynamics. |
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/1983/publication-1830.pdf |
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| Heral, Maurice; Deslous-paoli, Jean-marc; Garnier, Jacqueline; Prioul, Daniel; Heurtebise, Serge; Razet, Daniel. |
| Different types of pregrowth of the Japanese palourde are compared on the some site. The method by upwelling which is the more common used, to have good growth, requires a compromise between the running and the raised biomass. Two periods are critical, in the summer the growth of mollusks is stopped because of a decrease in the phytoplanktonic production ; in the winter, a fall in temperature lessens filtration and stops growth. The results concern clams consummatation rates of particular food (chlorophyll, protids, lipids, glucids) as weIl as the way to supply the decreasing growth : increase of phytoplankyonic production in the summer by recycling waters from nurseries that are loaded with ammoniac and raise winter temperatures by using under-ground... |
| Tipo: Text |
Palavras-chave: Nursery; Growth; Ruditapes philippinarum; Clams; Nurserie; Croissance; Ruditapes philippinarum; Palourdes. |
| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/1982/acte-2951.pdf |
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| Bayne, Bl; Iglesias, Jip; Hawkins, Ajs; Navarro, E; Heral, Maurice; Deslous Paoli, Jean-marc. |
| Mussels were fed four concentrations of seston (between 099 and 103mgtotalseston P), comprising three levels of organic content (719, 636 and 408%), made up from natural silt and two species of cultured phytoplankton. Two of the seston concentrations were below, and two above, the threshold at which pseudofaeces were produced. Measurements of physiological traits (filtration rates, pseudofaeces production, selection efficiency, absorption efficiency, absorption rates and rates of oxygen consumption) were made after 2 days and, for two of the seston concentrations, also after 12 days. When fed at a high concentration of seston of low organic content, the mussels increased their filtration rate, rejected a higher proportion of filtered material as... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-3069.pdf |
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| Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Manaud, Francois; Truquet, Isabelle; Garnier, Jacqueline. |
| After determining the seasonal features of the hydrobiology of the Marennes-Oléron's estuarine complex in 1976 and 1977 (Héral et al, 1983), based on seasonal campaigns conducted in 15 stations sampled in a tide half-cycle, it was proposed to monitor 5 stations spread out over the entire basin (figure 1) as part of the National Observation Network (RNO) with two monthly samples taken, one at neap tide, the other at spring tide. In the same way, station 3, at the centre of the basin, was sampled at tide half-cycle, on the same days but with a special effort to determine the dissolved and particulate organic substances. The goal of this paper is to introduce the results of the RNO's hydrobiological parameters at the stations of the Charente (5) estuary, the... |
| Tipo: Text |
Palavras-chave: Substances organiques particulaires; Substances organiques dissoutes; Marennes Oléron; Hydrobiologie. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/publication-2934.pdf |
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| Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert. |
| The uptake and release of material by oysters (Crassostrea gigas) in the intertidal zone were estimated in situ in the Bay of Marennes-Oléron (France) in spring and autumn. 10 m long plexiglass tunnels were placed over small tables with bags containing oysters or empty oyster shells (control). Although in the very turbid conditions of the water column sedimentation of suspended particulate material could be observed in control experiments, higher fluxes (uptake) of seston, POC and PON and especially chlorophyll occurred in the presence of live animals. Release of dissolved nutrients was not evident from the tunnel with oysters, which is in contrast with studies in other areas with bivalves. This is ascribed to limited mineralization of biodeposits as an... |
| Tipo: Text |
Palavras-chave: Chlorophyll; Seston; Oysters; Nutrient release; Material uptake. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/1994/publication-6842.PDF |
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| Ravail, Brigitte; Heral, Maurice; Razet, Daniel; Robert, Jean-michel. |
| Le suivi bi-mensuel des caractéristiques des eaux de l'estuaire de la Charente met en évidence les fortes teneurs en sels nutritifs transportés par ce fleuve. Les apports de fin d'hiver en nitrates sont supérieurs à 240 µ atg N 1(1). Le phosphore a un comportement particulier puisqu'en période de crue, il s'adsorbe sur les particules et le sédiment, jouant un effet régulateur, ainsi les aports ne dépassent guère 2 µ atg P 1(1) en hiver mais aussi en été. Les biomasses phytoplanctoniques vivantes ou dégénérescentes sont fortes avec deux périodes defflorescence bien marquées, mai-juin et octobre. Les teneurs en chlorophylle a atteignent è µg de chla pour la surface et 23 µgde chla pour le fond. Par ailleurs, les teneurs en phéopigments dépassent 31 µg de... |
| Tipo: Text |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00390/50177/50798.pdf |
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| Alzieu, Claude; Heral, Maurice; Thibaud, Yves; Dardignac, Marie-jose; Feuillet, Michèle. |
| Experiments in oyster-breeding areas where oyster Crassostrea gigas suffers from anomalies of calcification, show an obvious correlation between the importance of the malformation of shells and the vicinity of port areas where a great number of boats usually stay. Organotin compounds contained in antifouling paints, and more precisely Tributyltin fluoride (TBTF) induce, in experimental environment, similar anomalies to those observed in natural environment. The amounts of total tin in the tissues of oysters living in the vicinity of spots where organotin products are brought in, can reach high values, though they appear to decrease rapidly whereas the environmental contamination lessens. The authors suggest that results of organotin upon the mechanisms of... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Pollution effects; Toxicity; Calcification; Fouling control; Paints. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-1898.pdf |
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| Prou, Jean; Barille, Laurent; Heral, Maurice; Ratiskol, Gilles; Soletchnik, Patrick; Bougrier, Serge; Razet, Daniel; Geairon, Philippe. |
| During a fortnightly tidal cycle, a Mytilus edulis population was submitted to natural food conditions in the bay of Marennes-Oléron. During 4 tidal cycles, in vivo continuous measurements of turbidity and fluorescence were recorded to study the evolution of Total Particulate Matter (TPM), phaeopigments and chlorophyll-a concentrations. Turbidity in the water column is clearly influenced by resuspension of sediment. Degradated cells of phytoplankton were associated with sediments, involving strong correlation between phaeopigments and turbidity. High values of chlorophyll-a were encountered during neap tides when turbidity was low. No relation with resuspension processes were observed. No effect of fortnightly variability on retention was observed by... |
| Tipo: Text |
Palavras-chave: Ancova; Utilisation du matériel particulaire; Mytilus edulis; Moules. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/1994/publication-3079.pdf |
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| Prou, Jean; Goulletquer, Philippe; Heral, Maurice. |
| Historically, research involvement in shellfish industry appeared as soon as the 19th century with studies on oyster sanitary quality and nutritive values. Those aspects were developed to satisfy consumer's demand and public health issues. Later on, rearing technologies were developed to ensure optimization of the characteristics of shellfish population dynamic such as recruitment, growth, and mortality. In a third step, management of leasing grounds allocation required studies on ecosystems' functioning. It integrated over space and time relationships between environment (as a trophic resource) and shellfish production. Presently, new challenges regarding environmental protection and consumer's satisfaction have involved studies on optimized uses of... |
| Tipo: Text |
Palavras-chave: Zoosanitary issues; Seawater quality; Space allocation; Shellfish research; Shellfish industry. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-6252.pdf |
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| Grizel, Henri; Heral, Maurice. |
| The Japanese oyster (Crassostrea gigas) has been introduced in France on a large scale to replace cultivation of the Portuguese oyster (Crassostrea angulata), affected by a viral disease. The importation took place from 1971 to 1975, with broodstock coming from British Columbia (Canada) and spat from Japan. Good growth rate and success of the natural setting on the French Atlantic coast attested to the success of this implantation, with a production which reached 80000 t by 1976. The precautionary measures associated with this transfer Iimited the implantation of an introduced fauna, 15 years after, to: Balanus amphitrite, Aiptasia pulchella and, on the Mediterranean coast, Undaria pinnatifida and Laminaria japonica. The authors also discuss the possible... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Oyster; Introduction; Crassostrea gigas; Huître; Introduction. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/publication-2760.PDF |
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| Heral, Maurice; Bacher, Cedric; Deslous-paoli, Jean-marc. |
| Maurice Héral has been studying, since 1976 at the IFREMER Station of La Tremblade (France), the trophic networks of shellfish-farming ecosystems and, especially, the variability of available food, energy assessment, the ecophysiology of the Japanese oyster; he has set up a comprehensive model of shellfish farming production. He has been managing the Shellfish Farming Ecosystems Laboratory (LEC) since 1980. A specialist of digital models, Cédric Bacher has been working at the LEC since 1985. He invented a strategy of sampling farmed molluscs' biomass and a preliminary, analytic trophic model that combines physical and biological systems. Jean-Marc Deslous-Paoli has been a member of the same laboratory since 1979, where his work focuses on monitoring... |
| Tipo: Text |
Palavras-chave: Modèle analytique; Modélisation; Modéle global; Production; Capacité trophique; Biomasse; Climatologie; Captage naissain; Bassin Marennes Oléron. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/publication-3011.pdf |
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| Thomas, Gerard; Kantin, Roger; Heral, Maurice. |
| A coastal river 380 km long, the Charente river has a catchment area of about 10,000 km2, flowing through the departments of Charente and Charente-Maritime, as well as a small part of the border departments: Dordogne, Deux-Sèvres, Haute-Vienne and Vienne. Its main affluents are the Tardoire, the Seugne and the Boutonne rivers. The highest part of the catchment area is located in Dordogne, at a height of 496 m, whereas the river itself originates from a spring located at a height of 250 m to the south-east of Rochechouart, in the Haute-Vienne. The average height of the catchment area is quite low. In its downstream part, from the Saint-Savinien dam to the ocean, the Charente is influenced by a dynamic tide. The actual estuarine part begins in... |
| Tipo: Text |
Palavras-chave: Charente Maritime; Gestion eau; Qualité eaux; Conchyliculture; Capacité trophique; La Charente; Estuaire. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/publication-6289.PDF |
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| Registros recuperados: 148 | |
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