Consulta: subjectFacets:"Variations saisonnières"
Registros recuperados: 4
Data/hora: 01/06/2024 02:35:07

Etude des variations saisonnières de différents biomarqueurs, chez la moule Mytilus galloprovincialis. Relation avec certains paramètres physiques, chimiques et physiologiques
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bodin, Nathalie.
The aim of this study was to evaluate the seasonal variations of six biomarkers on Mytilus galloprovincialis, using comparison with physiological index and chemical contamination levels on two sites of  Mediterranean sea. The seasonal variations of acetylcholinesterase (AChE), DNA adducts, benzo(a)pyrene hydroxylase (BPH), heat-shock proteins (HSP), metallothioneins (MT) and multixeniobiotic proteins (MXR) were estimated over a two-year period, on mussels which were sampled in Carteau (original site) and La Fourcade (transplanted organisms). Carteau, an industrial site, presents higher contamination levels (HAP, PCB, heavy metals) than La Fourcade, an urban area. The PAH profiles underline a strong spatio-temporal variability of levels and sources of...
Tipo: Text
Palavras-chave: Biomonitoring; Mytilus galloprovincialis; Biomarqueurs; Variations saisonnières; Biomonitoring; Mytilus galloprovincialis; Biomarkers; Seasonal variations.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00443/55499/57042.pdf

Seasonal and inter-annual variability of bacterioplankton biomass at station Kerfix, off Kerguelen Islands, Antarctica
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Delille, D.
Between January 1992 and March 1995, the research project Kerfix undertook the first regular non-coastal multiyear acquisition of parameters related to the carbon cycle in the Southern Ocean at a time series station located at 50degrees40'S-68degrees25'E, 110 km southwest of the Kerguelen Islands. I present here a general overview of the bacteriological data collected during this survey. Bacterioplankton biomass at Kerfix station was always significantly lower than in the direct vicinity of the Kerguelen Islands. Bacterial abundance decreased from surface to deepest layers (from 10(6) cells ml(-1) in surface layer to 5.0 x 10(4) cells ml(-1) at 1500 m). In contrast, mean cell volume (0.1 mum(3)) and proportion of free-living bacteria (80%) were relatively...
Tipo: Text
Palavras-chave: Océan Antarctique; Biomasse bactérienne; Distribution verticale; Variations saisonnières; Variabilité interannuelle; Antarctic ocean; Bacterial biomass; Vertical distribution; Seasonal changes; Interannual variability.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43268/42999.pdf

Hydrologie du bassin de Marennes- Oléron. Analyse de la base de données "RAZLEC" 1977- 1995
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Faury, Nicole; Razet, Daniel; Soletchnik, Patrick; Goulletquer, Philippe; Ratiskol, Jacqueline; Garnier, Jacqueline.
An hydrobiological monitoring survey has been carried out in the Bay of Marennes-Oléron since 1977. Five stations, distributed over the Bay, were sam pied twice a month. Spatial and temporal trends of the physical characteristics (i.e., seawater, temperature, salinity, dissolved oxygen and suspended matter), nutrients (azote, nitrite, nitrate, silicate) and organic variables (chlorophyll a and pheopigments) were assessed by using a statistical time-series analysis mode\. It was used to distinguish seasonal variability from long term trends. Pluviometric data as weil as the Charente River fluxes were similary analyzed by the model. The seasonal variability showed an homogeneous pattern over the five stations for all parameters, but the site-dependent...
Tipo: Text
Palavras-chave: Shellfish farming; Overall trends; Seawater seasonal variability; Marennes Oleron Bay; Hydrology; Conchyliculture; Tendances; Variations saisonnières; Marennes Oléron; Hydrologie.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-6379.pdf

Evolution saisonnière des populations de diatomées benthiques dans les lagunes aménagées de Certes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Malissen, M.o.; Lasserre, P.
In lagoons and estuarine ecosystems, the benthic microflora contributes considerably to the primary production of the area and consists largely of diatoms Monthly samplings have been made from December 1976 to March 1978 in a shallow station characterized by the lack of macrophytes. Two sets of monthly sam­plings were made allowing in theone hand a qualitative analysis and on the other hand a quantitative study by cellular counts. The diatom populations show a cyclic evolution with two peaks : one in February 1977 and the other in September 1977. This cycle is confirmed by the di­versity and dominance analysis. Seasonal evolution is characterized by the domi­nance of one or more species with well marked succession of dominant species (Nitzschia Navicula et...
Tipo: Text
Palavras-chave: Diatomées benthiques; Variations saisonnières; Diversité; Lagunes; Bassin d'Arcachon; Benthic diatoms; Seasonal variations; Diversity; Lagoons; Arcachon Bay.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41679/40888.pdf