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Registros recuperados: 9
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Accumulation des sels nutritifs dans un sédiment lagunaire et environnement hydrodynamique ArchiMer
Gomez, E; Millet, B; Picot, B.
The Mejean-Perols Lagoon is situated on the French Mediterranean coast. It is a small (747 ha) and shallow (70 cm) lagoon. Some treated effluent from Montpellier flows into this hypereutrophic lagoon. The cartography of C, N and P concentrations in the sediment was studied based on 35 bottom samples. The nitrogen and organic carbon concentrations were more or less homogeneous, the highest concentrations being found in the middle of the lagoon. The phosphate was principally bound onto the sediment in the west zone. The observed distribution was independent of grain size, the distribution of which was rather homogeneous. In this lagoon water circulation is wind induced. Four different water flow structures were observed, as functions of the prevailing winds...
Tipo: Text Palavras-chave: Sédiment; Lagune côtière; Hydrodynamique; Sels nutritifs; Carbone; Sediment; Coastal lagoon; Hydrodynamics; Nutrients; Carbon.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43642/43247.pdf
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Apports nutritifs et bactériens en estuaire de Penzé. Année 2000 ArchiMer
Piriou, Jean-yves; Droit, Julie.
L'estuaire de la Penzé (nord-Finistère, France) est le siège de plusieurs dysfonctionnements de type biologique (eutrophisation et contaminations bactériennes) qui nécessitent une bonne connaissance et un suivi des apports d'origine terrigène susceptibles d'influencer ou de provoquer ces phénomènes. Une étude sur ce secteur test a permis la mise au point d'une méthodologie de suivi des apports à l'estuaire. Celle-ci se fait en quatre étapes: 1. Inventaire des paramètres de suivi des apports. • Dans le cas de la prolifération des macroalgues du genre ulva et des microalgues toxiques Alexandrium minutum, les différents apports nutritifs azotés, phosphorés et siliceux ont été mesurés. • Dans le cas de la contamination des mollusques bivalves d'ostréiculture...
Tipo: Text Palavras-chave: Apports; Bactéries; Bassins versants; Contamination; Eutrophisation marine; Rejets; Sels nutritifs.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00105/21660/19241.pdf
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Etude d'impact du rejet d'eau souterraine de la Station aqualive à Noirmoutier ArchiMer
Manaud, Francois.
La station "AQUALIVE" dans l'île de Noirmoutier doit utiliser dans un avenir proche des eaux souterraines riches en sels nutritifs à un débit de 300 m3/h. Un rejet a été constitué à l'aide du pompage expérimental reproduisant les conditions d'exploitation maximale prévues. Aucun effet certain n'a pu être observé sur l'eau de remplissage des claires (entre 1h avant et 1h après la pleine mer), ni d'effet cumulatif sur une période de 1 an.
Tipo: Text Palavras-chave: Sels nutritifs; Marais maritime; Rejet; Impact; Eau souterraine; Aquaculture.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00104/21564/19144.pdf
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Hydrologie et distribution de dinophysis en juin 1988, dans la frange côtière nord-Gascogne ArchiMer
Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele.
During the oceanographic cruise of June 1988, phytoplankton and correlated hydrological parameters were studied in the coastal area between Camaret and Ile d'Oléron. 62 stations were sampled in the 0-30 m layer within the 50 m depth limited coastal area. Observations focused on two toxic dinoflagellate species: Dinophysis spp and Gyrodinium aureolum. Dinophysis spp is more abundant in the Loire/Vilaine area, which is.characterized by high surface Nitrate levels, high 30 m depth Phosphate levels and Chlorophyll a amounts higher than elsewhere during the survey. This particuliar pattern can be related to the Nutrient outputs of Loire and Vilaine Rivers. Max. Dinophysis concentrations were observed in Vilaine bay (very high Phosphate levels) and in Douarnenez...
Tipo: Text Palavras-chave: Phytoplancton; Dinophysis; Gyrodinium aureolum; Hydrologie; Sels nutritifs; Campagne côtière; Nord Gascogne; Phytoplankton; Dinophysis; Gyrodinium aureolum; Hydrology; Nutrients; Coastal cruise; Northern Biscay.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00432/54323/58896.pdf
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La qualité des eaux dans l'Estuaire de la Gironde. 1- Traitement des données. 2 - Synthèse ArchiMer
Maurice, Laurence.
The main problem of the Girond estuary is a pollution by the cadmium. During this last ten years, the good quality of the water is proved by the analysis of the main physico - chemical and biochemical parameters and bacteria. But since 1989, straight to the Blayais power station, the BOD5 varied between 2 and 3,5 mg.l-1 and a diminution of the dissolved oxygen has been observed; it's probably caused by the accumulation of biodegradable organic matter in the maximum turbidity zone during years characterized by low river flows. For average river flow, urban discharges takes part for 20 % in total fluxes of BD05; in 1991, this part attempts 35 %. During the last 7 years, the pluriannual evolution of the nitrate concentrations measured in the Garonne river...
Tipo: Text Palavras-chave: Oxygène; Sels nutritifs; Matière organique; Bactéries; Apports; Estuaire Gironde; Oxygen; Nutrients; Organic matter; Bacteria; Fluxes; Gironde estuary.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00037/14855/12178.pdf
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Les apports en sels nutritifs dans l'estuaire de la Seine ArchiMer
Guillaud, Jean-francois.
In this report, nutrient concentrations and fluxes are evaluated at the Caudebec station in the Seine estuary; with a mean river flow of 413 m3/s, the values of mean interannual fluxes are 46 300 t per year for silicium, 90 700 t per year for total nitrogen and 11 000 t per year for total phosphorus ; since 1984, there is a decrease of phosphate fluxes (3 % per year) and an increase of total nitrogen fluxes (2 % per year).
Tipo: Text Palavras-chave: Sels nutritifs; Estuaire Seine; Flux; Nutrients; Seine estuary; Fluxes.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00425/53660/54499.pdf
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Réseau de surveillance du phytoplancton (REPHY). Observations sur le bassin d'Arcachon de 1987 à 1990 ArchiMer
Masson, Nadine.
Grâce au réseau de surveillance du phytoplancton  (REPHY) mis en place en 1984, une importante banque de données s'est constituée. L'étude quantitative et qualitative de la flore observée de 1987 à 1990 dans le bassin d'Arcachon permet de montrer les variations suivantes. En ce qui concerne le phytoplancton, Ces quatre années de sécheresse sont dans l'ensemble pauvres et peu contrastées mais montrent tout de même des schémas saisonniers similaires à ceux décrits par les précédents auteurs. Une alternance est observée avec 1987 et 1989 plus pauvres que 1988 et 1990. 1987 et 1989 sont aussi marquées par une sécheresse plus importante et par conséquent de fortes salinités et de faibles apports en sels azotés. D'un point de vue qualitatif, les diatomées...
Tipo: Text Palavras-chave: REPHY; Bassin d'Arcachon; Phytoplancton; Chlorophylle a; Température; Salinité; Sels nutritifs.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00427/53833/54837.pdf
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Role of macroalgal biomass and clam fishing on spatial and temporal changes in N and P sedimentary pools in the central part of the Venice lagoon ArchiMer
Sfriso, A; Facca, C; Ceoldo, S; Silvestri, S; Ghetti, Pf.
Nutrient concentrations have been investigated in the Venice lagoon for three scenarios: abnormal growth of nuisance macroalgae, decrease of macroalgal dominance and intense catching of the bivalve Tapes philippinarum Adams and Reeve by means of hydraulic and mechanical dredges. Total nitrogen and organic and total phosphorus monitored in June 1087, 1993 and 1998 showed significant changes both in concentrations and distribution. The disappearance of macroalgal blooms and the starting of intense clam fishing activities affected mainly organic phosphorus concentrations which, between 1987 and 1998, decreased from 104 +/- 42 to 59 +/- 31 mug cm(-3), accounting for 27% (1987) and 16% (1998) of total phosphorus, respectively. Peak values also decreased...
Tipo: Text Palavras-chave: Sels nutritifs; Sédiments superficiels; Biomasse microalgale; Lagune de Venise; Nutrient concentrations; Surface sediments; Macroalgal biomass; Clam fishing; Venice lagoon.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43280/43015.pdf
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Spatial variability in oxygen and nutrient fluxes at the sediment-water interface on the continental shelf in the Gulf of Lions (NW Mediterranean) ArchiMer
Denis, L; Grenz, C.
The spatial variability of oxygen and dissolved nutrient exchanges across the sediment-water interface was studied on the continental shelf in the Gulf of Lions (NW Mediterranean Sea). Replicate sediment cores were sampled at nine stations (64-162 m depth) along two lines parallel to the coast during two cruises in March and June 1998. Sediment-water exchanges were measured using the core incubation technique. Surficial sediments, bottom water and interstitial water characteristics were also described. Fluxes of oxygen (3.72-8.83 mmol m(-2) d(-1)), nitrate (0.026-0.283 mmol m(-2) d(-1)), ammonium (-0.022 to 0.204 mmol m(-2) d(-1)), nitrite (-0.034 to 0.002 mmol m(-2) d(-1)), phosphate (-0.007 to 0.029 mmol m(-2) d(-1)) and silicate (0.504-1.656 mmol m(-2)...
Tipo: Text Palavras-chave: Flux à l’interface eau-sédiment; Sels nutritifs; Minéralisation; Méditerranée nord-occidentale; Plateau continental; Sediment-water fluxes; Nutrients; Mineralization processes; NW Mediterranean; Continental shelf.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43263/42994.pdf
Registros recuperados: 9
Primeira ... 1 ... Última
 

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