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Biochemical substrates expenses and respiration at short-term starvation of marine planktonic animals ArchiMer
Pavlova, Z; Morozova, A; Gaudy, R; Shchepkin, V.
One of the most important indices at estimation of productivity characteristics of hydrobionts is oxygen consumed in the process of respiration. Usually respiration (standard metabolism) is measured in small-volume respirometres (30-50 ml) where animals' activity is considerably restricted. It may underestimate respiration in comparison to natural one. Therefore respirometres of larger volume were used. Simultaneously under same conditions we tried to estimate energy requirements by expense of main biochemical components of organic matter (lipids, protein, glycogen). Results were used to calculate energy budget and to compare energy expenditures, measured according to consumed oxygen and tissue substrates expense.
Tipo: Text Palavras-chave: Euchirella curticauda; Pleuromamma abdominalis; Scolecithrix danae; Ostracoda; Copepoda; Starvation; Oxygen consumption; Biochemical composition; Zooplankton; Energy budget; Respiration; Biological production.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1520.pdf
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Biologie et genetique des populations de crustaces. Strategies mises en jeu, essai de synthese ArchiMer
Gaudy, R; Kerambrun, P.
Population genetics, which analyses the genetic structure of natural populations, has an an objective a better understanding of the mechanisms of support of the polymorphism and of the relations between this one and physical, chemical and trophic conditions of the environment. In this double objective, population genetics meet the biology of populations whose demographic aspects can be disturbed by a decrease of polymorphism (inbreeding) or by changes in ecological conditions.
Tipo: Text Palavras-chave: Crustacea; Biopolymorphism; Animal populations; Ecophysiology; Genetics.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/acte-1394.pdf
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Biomass, metabolism and nutrition of zooplankton in the Gulf of Lions (NW Mediterranean) ArchiMer
Gaudy, R; Youssara, F; Diaz, F; Raimbault, P.
Zooplankton biomass was measured at 20 stations located along five coastal-offshore transects in the Gulf of Lions (NW Mediterranean) during spring 1998 and winter 1999, using two nets equipped with 200 and 80 Pm mesh. Biomass was twice as abundant in spring. It increased toward the coast and the west of the gulf and was positively correlated to chlorophyll, primary production and organic particulate matter and negatively to temperature and salinity. The enrichment effect of Rhone river input and the oligotrophic influence of the north Mediterranean current (NMC) were the main distribution factors of zooplankton biomass. Higher biomass was obtained in coastal stations with the 80 mum net, which sampled more efficiently young larval stages and nauplii....
Tipo: Text Palavras-chave: Zooplankton; Métabolisme; Cycle saisonnal; Golfe du Lion; Zooplankton; Metabolism; Seasonal cycle; Gulf of Lions.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43262/42993.pdf
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Carbon fluxes from the microbial food web to mesozooplankton. An approach in the surface layer of a pelagic area (NW Mediterranean Sea) ArchiMer
Vanwambeke, F; Christaki, U; Gaudy, R.
The microbial food web structure, the carbon flux between mesozooplankton and the microbial community, and the importance of heterotrophs in the diet of marine zooplankton were investigated in the surface layer of a pelagic area of the NW Mediterranean Sea in five 24-h shipboard experiments: Heterotrophic flagellates grazed 65 % to 91 % of the bacterial production. However, the protozoan community seems also to utilize alternative carbon sources, such as small autotrophs. In most of the experiments, the estimated production of the protozoan > 7 mu m was sufficient to supply mesozooplankton carbon demand. Copepods stimulated bacterial growth, presumably through excretion and preference for heterotrophic flagellates. Variations of the experimentally...
Tipo: Text
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00096/20727/18364.pdf
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Nutrition chez des copepodes en milieu lagunaire mediterraneen en fonction de la concentration en particules et de la temperature ArchiMer
Gaudy, R; Pagano, M.
The zooplankton of an eutrophic brackish lagoon (Etang de Berre), near Marseille (France) was studied during an annual cycle. It was characterized by large populations of a pelagic copepod (Acartia tonsa ). Grazing on natural particles by this species was investigated. Adults were able to use an extended range of particle sizes, but showed selectivity for particles concentration was observed (14 mu m). Temperature and particles concentration appear to modify the selectivity behavior. Juvenile stages could also catch particles of various size but did not show the same selectivity for the peak particles as adults. Daily food ration was high comparatively to open-sea copepods. Taking into account several results obtained on food ration, egg production and...
Tipo: Text Palavras-chave: Copepoda; Lagoons; Energy budget; Seasonal variations; Particle concentration; Zooplankton; Food availability; Temperature effects; Nutrition.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1526.pdf
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Respiration, mineral excretion and digestive enzymatic activity of copepods from Indian Ocean, in relation with nutritional strategy ArchiMer
Gaudy, R; Boucher, Jean.
Respiration, mineral excretion (nitrogen and phosphorus) and specific activity of amylase and trypsin were studied with several species of copepods from an oceanic tropical area of the Indian Ocean. O/N ratios were significantly different in some species or some groups of species. There was a direct relationship between these values and the ratio of specific activities of amylase and trypsin (A/T). Scolecithrix danae was maintained during 2 or 3 days under different food regime conditions (starvation, algae or mixed food). Its O/N ratio showed steady values but its O/P ratio increased with algal food or during starvation. The trypsin activity was activated only when animal material was present in the diet. These results are discussed according to the...
Tipo: Text Palavras-chave: ISW; Indian Ocean Scolecithrix danae Copepoda Digestion Diets Phosphorus Nitrogen Nutrition Enzymatic activity Excretion Respiration Animal metabolism.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1517.pdf
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Short term variations in feeding and metabolism of Acartia tonsa (pelagic copepod) in the Berre lagoon (France) ArchiMer
Gaudy, R; Pagano, M; Cervetto, G; Saintjean, L; Verriopoulos, G; Beker, B.
Feeding, respiration, and ammonia excretion of Acartia tonsa were studied in a brackish lagoon, near Marseilles (Southern France). The experiments were performed during the same season in two successive years, using naturally occurring particles as food. Strong variations in both quantity and quality of food particles were recorded between the two series of experiments. The ingestion of particles according to their size was studied by means of the Coulter Counter technique. Females ingested more food than males. In both sexes, there was a tendency to select median to large particles, regardless of the shape of the particles-size spectrum. In 1990, the specific production rate, deduced from the energy budget, was equivalent to or greater than the observed...
Tipo: Text Palavras-chave: Acartia tonsa; Feeding; Metabolism; Production.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00096/20731/18368.pdf
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Space and time variations in zooplankton distribution south of Marseilles ArchiMer
Gaudy, R; Champalbert, G.
The mesozooplankton distribution in the upper water layer (up to 200 m) off Marseilles (NW Mediterranean Sea) was studied during 22 cruises performed between March 1992 and February 1995. Four stations (M1, M3, M5 and M7) were investigated along a coast-open sea transect. Spatial and seasonal variations of zooplankton were described using different quantitative parameters: biomass (dry weight, carbon, nitrogen), displacement volume (biovolume) and abundance of total organisms. C/N ratio, dry weight per individual and volume per individual were also calculated. The seasonal quantitative variations occurring at the four stations were not well synchronized. Annual maximum biomass was observed during spring and summer at M1 but only in early spring at the...
Tipo: Text Palavras-chave: Zooplancton; Distribution spatio-temporelle; Gradient côte-large; Méditerannée nord-occidentale; Zooplankton; Space-time distribution; Open-coast sea gradient; Northwestern Mediterranean.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43641/43225.pdf
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Variations of zooplankton in the frontal area of the Alboran sea (Mediterranean sea) in winter 1997 ArchiMer
Youssara, F; Gaudy, R.
Zooplankton from the upper 200 m of the Almeria-Oran frontal region, (east of the Alboran sea, western Mediterranean) was sampled during winter 1997, using two nets equipped with 200 and 80 mum mesh. Eight sites representative of the different hydrodynamic structures (Mediterranean water, geostrophic Atlantic jet, associated anticyclonic gyre) were investigated over 2 d, using two day- and two night-samples per site. Zooplankton biomass was correlated to chlorophyll abundance, with lowest values in the oligotrophic Mediterranean water and highest in Atlantic water. The high biomass resulted from the enhancement of the secondary production, as indicated by the greater proportion of nauplii and the increase of zooplankton metabolism and feeding. Total...
Tipo: Text Palavras-chave: Mer d’Alboran; Distribution; Front; Zooplancton; Alboran sea; Distribution; Front; Zooplankton.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43348/42878.pdf
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Variations of zooplankton metabolism and feeding in the frontal area of the Alboran Sea (western Mediterranean) in winter ArchiMer
Gaudy, R; Youssara, F.
Respiration, excretion (NH4 and PO4) and feeding of zooplankton from the upper 200 m of the Almeria-Oran frontal region (western Mediterranean), were studied during winter 1997. Eight sites belonging to the three main hydrodynamic structures of the area (Mediterranean water, geostrophic Atlantic jet and associated anticyclonic gyre) were considered. Lowest values of respiration, PO4 excretion, O/P atomic ratio and particle ingestion were found in Mediterranean waters. At the frontal limit, respiration and ammonium excretion were enhanced compared to the adjacent structures (Mediterranean water and Atlantic jet). In the gyre water, lowest O/N and highest N/P values were observed and maximum faecal pellet production and reproduction activity (inferred from...
Tipo: Text Palavras-chave: Mer d'Alboran; Front; Zooplancton; Métabolisme; Nutrition; Alboran sea; Front; Zooplankton; Metabolism; Feeding.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43275/43006.pdf
Registros recuperados: 10
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