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Registros recuperados: 9
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Biologie du copepode Eurytemora affinis hirundoides dans la Gironde: Donnees morphometriques ArchiMer
Feurtet, A; Castel, J.
Eurytemora affinis hirundoides is the most abundant copepod in the Gironde Estuary which is submitted to strong salinity gradients. The response of the populations to these gradients is measured by following the variation of simple biometric characteristics. The observed variations reflect the influence of two important factors: salinity and turbidity.
Tipo: Text Palavras-chave: ANE; France; Gironde Estuary Copepoda Turbidity Biometrics Environmental effects Animal morphology Biology Ecophysiology.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/acte-1406.pdf
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Des sites possibles pour l'aquaculture marine sur le littoral d'Arles et de Port St Louis du Rhône. Reconnaissance et étude hydrobiologique ArchiMer
Hussenot, Jerome; Castel, J; Seret, Bernard; Skubich, M; Morin, L.
Tipo: Text
Ano: 1977 URL: http://archimer.ifremer.fr/doc/00020/13119/10128.pdf
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Distribution quantitative du méio- et macrobenthos dans des lagunes mixohalines - Influence du confinement sur le partage des ressources ArchiMer
Castel, J; Labourg, Pj; Escaravage, V; Thimel, A.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00131/24254/22247.pdf
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Dynamique du copepode Eurytemora hirundoides dans l'estuaire de la Gironde: Effet de la temperature ArchiMer
Castel, J; Courties, C; Poli, J M.
The seasonal pattern of the abundance of the planktonic copepod Eurytemora hirundoides shows the highest numbers are associated with temperatures between 10 and 20 degree C. However, for this temperature range, the abundance is higher in spring than in autumn. The evolution of the intrinsic rate of increase (r sub(m), determined in laboratory), as a function of the evironmental temperature, predicts a peak abundance at the end of May which is consistent with observations. The decrease of r sub(m) occurring from 18 degree C cannot be the only explanation for the decline of the summer population. Other factors are involved: oxygen tension, competition. Two types of action of the temperature, direct in spring, indirect in summer, must be taken into account to...
Tipo: Text
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00247/35788/34301.pdf
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Regulation biologique du meiobenthos d'un ecosysteme lagunaire par un alevinage experimental en soles (Solea vualgaris ) ArchiMer
Castel, J; Lasserre, P.
The "fish reservoirs" of the Arcachon Basin (France) are artificial ponds created in lagoonal marshes. Opportunistic populations of microorganisms and of meiofauna increase the tendency to create dystrophic crisis. Fry stocking of soles (Solea vulgaris ) into the fish ponds have been made to estimate the influence of the predatory activity and bioturbation on the food web. For 10 soles/m super(2), the abundance of opportunistic populations of meiofauna decreases and this result indicates a modification in competitive interactions contributing to a better spatial heterogeneity in the ecosystem. These results could be used in aquaculture ponds to regulate opportunistic microorganisms and meiofauna.
Tipo: Text
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00246/35707/34216.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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Spatial distribution and dynamics of microphytobenthos biomass in the Gironde estuary (France) ArchiMer
Santos, Pjp; Castel, J; Souzasantos, Lp.
The spatial variation of microphytobenthos was investigated with reference to both the estuarine gradient and the intertidal levels of the Gironde estuary, France. Four transects, each with three stations, were surveyed in two different seasons (April and October) during two consecutive years. In addition, the seasonality of microphytobenthic pigment concentration and its relationship to environmental factors were examined by means of weekly sampling at an intertidal mudflat located in the oligo-mesohaline area. Generally, microphytobenthic pigments increased both with increasing salinity and tidal height. Clear seasonal variations were found for microphytobenthic chlorophyll-a concentration. Multivariate analysis showed environmental factors such as...
Tipo: Text
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20414/18081.pdf
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Stimulation de la productivité naturelle par enrichissements minéraux et organiques : étude en mésocosmes naturels ArchiMer
Hussenot, Jerome; Castel, J; Fardeau, Jean-claude; Feuillet-girard, Michèle; Gautier, Dominique; Gouleau, Dominique; Legrand, C; Martin, Jean-louis; Pirastru, L; Ravail, Brigitte; Rince, Y; Sautour, Benoit.
Il a été étudié sur 9 bassins de terre expérimentaux de 200 m3, à l'état initial identique, l'influence de 2 types de stimulation sur les populations naturelles planctoniques et benthiques et sur la qualité physico-chimique de I'eau et du sédiment en comparaison avec des bassins de référence non stimulés.
Tipo: Text Palavras-chave: Marais aquacoles; Productivité naturelle; Fertilisants.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00020/13115/10124.pdf
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Surveillance écologique du site du Blayais - Année 1992 ArchiMer
Quintin, Jean-yves; Castaing, P; Jouanneau, Jean-marie; Oggian, Georges; Poirier, Dominique; Chaurial, Bernard; Serceau, R; Castel, J; Sautour, Benoit.
Le schéma général des études écologiques relatives à l'implantation des centrales nucléaires en estuaire prévoit deux étapes: - le projet qui a pour but de préciser l'état écologique du milieu dans la zone qui subira l'influence de la centrale. - la surveillance qui correspond à l'étude des fluctuations naturelles du milieu (variations pluri-annuelles notamment) avant la mise en service de la centrale, et des modifications du milieu après la mise en service de la centrale. Projet et surveillance écologiques sont deux phases complémentaires d'une même étude, qui visent à mettre en évidence les règles évolutives d'un écosystème soumis aux effluents thermiques d'une centrale nucléaire. Les lois recherchées, utilisables à des fins prédictives, ne peuvent...
Tipo: Text
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00069/18065/15610.pdf
Registros recuperados: 9
Primeira ... 1 ... Última
 

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