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Registros recuperados: 7
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Échanges ioniques à l'interfacde eau-sédiment en Mer de Norvège et en Atlantique intertropical ArchiMer
Sautriot, D; Romano, Jc; Laborde, P; Daumas, R.
Tipo: Text
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00122/23332/21156.pdf
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Hétérogénéité spatiale à petite échelle des structures d'accumulation du matériel particulaire à l'interface air-mer ArchiMer
Romano, Jc; Laborde, P.
Tipo: Text
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00110/22083/19724.pdf
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Initiation of winter phytoplankton blooms within the Gironde plume waters in the Bay of Biscay ArchiMer
Labry, Claire; Herbland, Alain; Delmas, Daniel; Laborde, P; Lazure, Pascal; Froidefond, J; Jegou, Anne-marie; Sautour, B.
Thermostratification and seasonal Light increase are generally considered the first causes of phytoplankton spring blooms in temperate waters. The objective of this study is to confirm the existence of winter phytoplankton blooms, responsible for the early exhaustion of phosphate, within the Gironde plume waters (southeast Bay of Biscay), and to understand what may initiate them so early. Two cruises, BIOMET 2 and BIOMET 3, were carried out respectively in early (8 to 21 January) and late winter 1998 (25 February to 11 March). An increase of phytoplankton biomass (chl a) between the 2 cruises and non-conservative nutrients observed in late winter confirm an early phytoplankton growth both in the Gironde plume and adjacent oceanic waters. Among factors that...
Tipo: Text Palavras-chave: Vertical attenuation coefficient; Halostratification; Light availability; Winter blooms.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-810.pdf
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Monosaccharide composition of suspended organic particulate matter in relation to its origin ArchiMer
Compiano, Am; Romano, Jc; Delagiraudiere, I; Laborde, P.
Samples of phytoplankton cultures and of suspended particulate matter from continental, brackish and marine waters were examined by HPLC for the monosaccharide content of their hydrolysable sugar fraction. Eight monosaccharides were currently assayed and their weight compared to HPLC-assayed chlorophyll a concentrations. With the exception of oligotrophic waters, these two variables are well correlated in the various prospected environments. Glucose was always the strongly dominant form, not only in fresh and brackish waters but also in marine samples with high phytoplanktonic biomass. If samples are compared on a salinity basis, only four monosaccharides showed significant differences in their relative concentrations, as a consequence of sampling...
Tipo: Text Palavras-chave: MONOSACCHARIDE; HPLC; PARTICULATE MATTER; SEA WATER; BRACKISH WATER.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21134/18754.pdf
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Phytoplankton spring bloom of the Gironde plume waters in the Bay of Biscay: early phosphorus limitation and food-web consequences ArchiMer
Herbland, Alain; Delmas, Daniel; Laborde, P; Sautour, B; Artigas, F.
During the spring 1995 (2-25 May), a cruise was carried on the RV Poseidon (Germany) on the continental shelf of the south Bay of Biscay. The objective was a comprehensive study of the planktonic food web within the Gironde plume waters. In these waters phosphate was present at very low concentrations (undetectable to < 0.1 mu mol.L-1), whereas nitrate, silicate and ammonium concentrations were much higher (several mu mol.L-1 for nitrate and silicate and 0.5 to 1.0 mu mol.L-1 for ammonium). The size distribution of the phytoplankton biomass (estimated from chlorophyll a measurements by high performance liquid chromatography) and primary production (measured by C-14 in situ method) showed a great proportion of small (40 to 70 % < 3 mu m) and active...
Tipo: Text Palavras-chave: Phosphate; Phytoplancton; Facteur limitant; Estuaire; Eau côtière; Phosphate; Phytoplankton; Limiting factor; Estuarine water; Coastal water.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-850.pdf
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Response of biota to sedimentary organic-matter quality of the west gironde mud patch, bay of biscay (france) ArchiMer
Relexans, Jc; Lin, Rg; Castel, J; Etcheber, H; Laborde, P.
Relationships between benthos and sedimentary organic matter quality were analyzed in the West Gironde Mud Patch (WGMP), on the shelf of the Bay of Biscay, off the Gironde estuary, as part of the multidisciplinary national programme Ecomarge, a JGOFS-France contribution. At three stations located on an east-west transect and at different periods from 1985 to 1988, the following parameters of the sediment were analyzed: POC (particulate organic carbon); SIGMA (sum of easily extractable macromolecules thought to be the most degradable part of particulate organic matter); pigments as indices of organic matter quality; ETS (electron-transport-system) activities and meiofauna densities as indices of benthic responses. Sediments from the WGMP have an overall low...
Tipo: Text Palavras-chave: BENTHOS; ELECTRON-TRANSPORT-SYSTEM (ETS); MEIOFAUNA; POC QUALITY; ORGANIC MATTER.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00101/21231/18848.pdf
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Typology of environmental conditions at the onset of winter phytoplankton blooms in a shallow macrotidal coastal ecosystem, Arcachon Bay (France) ArchiMer
Gle, C; Del Amo, Y; Bec, B; Sautour, B; Froidefond, J; Gohin, Francis; Maurer, Daniele; Plus, Martin; Laborde, P; Chardy, P.
Phytoplankton dynamics were assessed in the macrotidal ecosystem of Arcachon Bay through high-frequency surveys over a 5-year period in order to characterize typology of environmental conditions at the onset of the productive period. Temporal variations of hydrological and biological parameters were examined in external and internal waters of the lagoon, during the winter-spring periods from 1999 to 2003. An additional survey was performed during winter-spring 2005 in order to study the vertical structure of the water column. The occurrence of winter phytoplankton blooms between January and March emerged as a recurrent event. The early onset of the productive period is influenced by the biological functioning of adjacent Bay of Biscay oceanic waters. It is...
Tipo: Text Palavras-chave: Macrotidal ecosystem; Phytoplankton inoculum; Onset; Winter blooms.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3513.pdf
Registros recuperados: 7
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