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Registros recuperados: 10
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Assessment of sediment concentration and nutrient loads in effluents drained from extensively managed fishponds in France Inra
Banas, D.; Masson, G.; Leglize, L.; Usseglio-Polatera, P.; Boyd, C.E..
Expansion of aquaculture has increased concern over its environmental impact. The composition of effluents from intensive aquaculture is well documented, but few data on extensive aquaculture are available. During 12 draining operations, 523 water samples were collected downstream from six extensively-managed fishponds in northeastern France. Study ponds had surface areas of 2–620 ha and were managed for production of Cyprinids and Percids. Concentrations of total suspended solids, total phosphorus, and Kjeldahl nitrogen in effluents from the ponds were greatest during the final stage of draining. Loads of phosphorus were higher than those reported for effluents of more intensive aquaculture ponds in the USA, but the source of the potential pollutants was...
Tipo: Journal Article Palavras-chave: SUSPENDED SOLIDS; NUTRIENTS; PHOSPHORUS; NITROGEN; FISH PRODUCTION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010ce3c6d7b&uri=/notices/prodinra1/2010/06/
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Distribution and seasonal variability of nutrients and dissolved-oxygen in the northeastern ionian sea ArchiMer
Souvermezoglou, E; Hatzigeorgiou, E; Pampidis, I; Siapsali, K.
In this paper we present for the first time detailed nutrient and oxygen figures for the Ionian Sea. The data were collected during cruises in March-April 1987 and August-September 1987, in the framework of the multi-nation research programme for the exploration of the Eastern Mediterranean, POEM. The oxygen and nutrient pattern is affected by the presence of mesoscale cyclonic and anticyclonic gyres in the area, the most interesting feature of which is the large anticyclonic flow region southwest of Peloponnesus (Pelops gyre). The chemical characteristics of the main water masses were also determined. In the deep layer of the stations near the Otranto Strait we have found, in winter, newly formed Adriatic Bottom Water (O2 : 5.3 ml/l). This water mass has...
Tipo: Text Palavras-chave: EASTERN MEDITERRANEAN; IONIAN SEA; NUTRIENTS; OXYGEN; DISTRIBUTION.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00101/21183/18800.pdf
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Effects of propiconazole on extra-cellular enzymes involved in nutrient mobilization during Trametes versicolor wood colonization Inra
Lekounougou, S.; Jacquot, J.P.; Gérardin, P.; Gelhaye, É..
The effects of propiconazole on extra-cellular enzyme levels in Trametes versicolor have been investigated during wood colonization and degradation. The working hypothesis was that the biocide could alter metabolic pathways, which could lead to an alteration of extra-cellular enzyme production. In the presence of a propiconazole sub-lethal concentration, the wood degradation rate decrease concomitantly with the lag phase of fungal development observed during wood colonisation. The pattern of production of enzymes involved in polysaccharide degradation (b-glucosidases, glucuronidases, cellobiohydrolases), nitrogen (leucine aminopeptidase) and phosphorus (acid phosphatase) mobilization was only slightly altered in the presence of the biocide. In experiments...
Tipo: Journal Article Palavras-chave: PROPICONAZOLE; TRIAZOLE; CHAMPIGNON LIGNIVORE; TRAITEMENT CHIMIQUE; MECANISME ACTION; ENZYME EXTRA-CELLULAIRE; B-GLUCOSIDASE; GLUCURONIDASE; B-CELLOBIOSIDASE; LEUCINE AMINOPEPTIDASE; PHOSPHATASE ACIDE; CHITINASE; CAFEINE; CROISSANCE FONGIQUE; INHIBITION; PRESERVATION DU BOIS ACID PHOSPHATASE; BETA-GLUCOSIDASE; BIOCIDES; CAFFEINE; CHITINASE; COLONIZATION; ENZYME ACTIVITY; ENZYMES; MICROBIAL DEGRADATION; MOBILIZATION; NUTRIENTS; PROPICONAZOLE; WOOD PRESERVATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010d5b49ffa&uri=/notices/prodinra1/2010/11/
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Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters Inra
Ranger, J.; Loyer, S; Gelhaye, D.; Pollier, B.; Bonnaud, P..
Les effets de la coupe à blanc d’une plantation de Douglas de 70 ans ont été observés sur la composition chimique des solutions du sol et les pertes d’éléments par drainage, par un suivi mensuel pendant 6 ans avant, et 3 ans après la coupe. L’exploitation du peuplement a été réalisée avec une perturbation minimum du sol. Les résultats montrent que les solutions liées ont peu évolué après la coupe, alors que le changement des solutions libres a été drastique dans les horizons de surface du sol. Malgré des incertitudes sur le rôle de la végétation spontanée, le drainage d’éléments n’a pas fortement augmenté après la coupe. La prise en compte de l’ensemble des flux mesurés dans cette étude semble pouvoir expliquer les observations. Les pertes limitées après...
Tipo: Journal Article Palavras-chave: BIOGEOCHIMIE; EAU DE DRAINAGE; EROSION; DOUGLAS; COUPE-A-BLANC; SOLUTIONS DU SOL; ELEMENTS NUTRITIFS; LIXIVIATION DOUGLAS-FIR; CLEAR-CUTTING; SOIL SOLUTIONS; NUTRIENTS; LEACHING.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010a286e67c&uri=/notices/prodinra1/2010/10/
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Évolution printanière des éléments nutritifs et du phytoplancton sur le plateau continental armoricain (Europe du Nord-Ouest) ArchiMer
Morin, P; Lecorre, P; Marty, Y; Lhelguen, S.
The evolution of nutrient distribution has been followed in spring on the Armorican shelf in association with hydrological features and phytoplankton development. Data were collected on a sampling grid of 20 stations on the continental shelf during four cruises (SATIR 8 to 11) between March and June 1982. Haline fronts (Ushant haline front, coastal haline front) were found in late winter and early spring; their outlines follow closely the outlines of the summer thermal fronts. The origin of these haline fronts comes mainly from the outflow towards the English Channel of the waters of the Loire river on the South Brittany shelf. At this time of the year, a conservative mixing is observed between offshore waters with relatively low nutrient concentrations...
Tipo: Text Palavras-chave: NUTRIENTS; CONTINENTAL SHELF; NORTH-WEST EUROPE; TIDAL FRONTS; PHYTOPLANKTON.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21256/18869.pdf
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Flux de nutriments entre la Manche et la Mer du Nord. Situation actuelle et évolution depuis dix ans ArchiMer
Bentley, D; Lafite, R; Morley, Nh; James, R; Statham, Pj; Guary, Jc.
As part of the MAST I-FluxManche initiative, a monthly (September 1990 to November 1991) sampling programme has been carried out in the Dover Strait. Samples were taken (weather permitting) at two depths at each of six standard stations between Folkestone and Cap Gris-Nez. Data from all surveys, in conjunction with estimates of water movement derived from hydrodynamic numerical model, have been used to calculate fluxes of nutrients between the Channel and the North Sea. Results demonstrate that although nutrient concentrations are lower in the central channel-waters than in the coastal zone, the dissolved nutrient flux to the North Sea is mom important for stations of the central part of the Dover Strait as water. Current concern about possible increases...
Tipo: Text Palavras-chave: NUTRIENTS; FLUXES; DOVER STRAIT.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21124/18744.pdf
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Net community production in high nutrient-low chlorophyll waters of the tropical and antarctic oceans - grazing vs iron hypothesis ArchiMer
Minas, Hj; Minas, M.
An analysis of tropical upwelling systems shows a great range in the rate of increase of the standing stock expressed in terms of the water column chlorophyll content. Grazing appears to be the main factor responsible for lowering the rate of increase, especially in moderate and strong High Nutrient-Low Chlorophyll (HNLC) waters. A simple model comparing Net Community Production (NCP) rates with observed chlorophyll increase rates, leads us to conclude that phytoplankton population must present high specific growth rates on a daily rhythm in order to overcome grazing. Maximum specific growth rates (V(max)) calculated for daily total production (TP) are, in the two main upwelling areas, 137 d-1 off NW Africa and 1.04 d-1 off Peru. For extreme HNLC...
Tipo: Text Palavras-chave: NUTRIENTS; NEW PRODUCTION; GRAZING; TROPICAL OCEAN; ANTARCTIC.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00100/21149/18768.pdf
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Nutrients (P, N, Si) in the channel and the dover strait - seasonal and year-to-year variation and fluxes to the north-sea ArchiMer
Laane, Rwpm; Groeneveld, G; Devries, A; Vanbennekom, J; Sydow, S.
Recent measurements (1986-1988) of the distribution of the concentration of different nutrients (nitrogen, phosphorus and silicate) in the Dover Strait have been used, combined with older results, to calculate the total flux (dissolved and particulate) of nutrients into the North Sea. Special efforts are made to take into account in the fluxes the tidal, geographical and temporal variations in the concentrations of the different nutrients. No vertical gradients in the concentration of the different nutrients were found. Increased nutrient concentration was found in the coastal zones of England and France, compared to the Atlantic water in the central part of the Dover Strait The variation within a single year and between different years in the data...
Tipo: Text Palavras-chave: NUTRIENTS; FLUXES; NORTH SEA; CHANNEL; TRENDS.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21125/18745.pdf
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Regulation of endocytosis by external stimuli in plant cells Inra
Leborgne-Castel, N.; Luu, D..
Endocytosis is an essential process for the normal growth and development of eukaryotic cells. This mini-review presents an overview of endocytosis regulation in challenging environmental conditions such as nutrient availability, hormonal treatment or abiotic/biotic stress in plant cells. Recent data establishing a relationship between endocytosis and reactive oxygen species (ROS) production are also discussed.
Tipo: Journal Article Palavras-chave: ENDOCYTOSIS; PLANT; NUTRIENTS; ABIOTIC and BIOTIC CUES; REACTVE OXYGEN SPECIES (ROS).
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201078d29859&uri=/notices/prodinra1/2011/05/
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Water masses and phytoplankton biomass distribution during summer in the weddell sea marginal ice-zone ArchiMer
Perez, Ff; Tokarczyk, R; Figueiras, Fg; Rios, Af.
This study - carried out between the Elephant and the Orkney islands - showed that spatial variability in the marginal ice-edge zone (MIZ) was greater than that found in open sea. Salinity and silicate contents point to the existence of two fronts: the first - near Elephant Island - separates the Surface Antarctic Water coming from Drake Passage from the winter water originating in the Weddell Sea. This water is characterized by its high concentrations of nitrate (> 30 mu M) and silicates (> 80 mu M). The second front - near the South Orkney Islands undergoes the influence by a less saline water lens (< 34 %), poor in nutrients (N-NO3 < 24 mu M) and rich in chlorophyll (> 3.5 mg Chl a 1(-1)). Water masses circulation reveals the existence of...
Tipo: Text Palavras-chave: MARGINAL ICE; WEDDELL SEA; WATER MASSES; NUTRIENTS; CHLOROPHYLL.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00098/20883/18497.pdf
Registros recuperados: 10
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