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| Registros recuperados: 10 | |
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| Gremare, A; Amouroux, Jm; Charles, F; Medernach, L; Jordana, E; Nozais, C; Vetion, G; Colomines, Jc. |
| Gross sedimentation rates (GSRs) were monitored together with meteorological data and the main biochemical characteristics of the collected material (i.e. organic content, C, N, total proteins, carbohydrates, lipids and available proteins) over a three year cycle at a shallow station (18 m) of the Bay of Banyuls, France. GSRs were between 0.26 (11/04/92) and 317.75 gDW m(-2) d(-1) (18/02/94). They followed an annual cycle with low and relatively constant values during spring and summer and high, variable Values during fall and winter. During the study GSRs correlated poorly (state of the sea, precipitation) or even non-significantly (wind speed) with the main meteorological parameters. GSRs correlated negatively with the organic content of the material... |
| Tipo: Text |
Palavras-chave: Matière organique particulaire; Qualité; Variabilité temporelle; Zone côtière; Particulate organic matter; Quality; Temporal variability; Coastal zone. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00325/43640/43226.pdf |
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| Medernach, L; Gremare, A. |
| We compared the ability of three direct methods (increment summation, loss summation and instantaneous growth rate coefficient), the size-frequency method, and eight indirect methods (Banse and Mosher, Benke, Brey, Edgar, Morin and Bourassa, Plante and Downing, Robertson and Schwinghamer et al.) to measure or to predict the secondary production of a Mediterranean population of the polychaete Ditrupa arietina. This comparison was carried out both on the 1994 cohort during its two-year lifespan and on the entire population during the two years of the study (1994-1996). Our results showed that all three direct methods are more or less equivalent. Results referring to the year 1994-1995 showed a strong overestimation of the actual production by the size... |
| Tipo: Text |
Palavras-chave: Production secondaire; Méthodes; Polychètes; Méditerranée; Secondary production; Methods; Polychaetes; Mediterranean Sea. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43614/43916.pdf |
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| Amouroux, Jm; Gremare, A; Cahet, G. |
| Changes of radioactivity in a natural C-14 labelled sediment were monitored over a 120-hour period in the presence and in the absence of the deposit-feeding bivalve Abra alba. In both cases, the sediment showed great instability during the first ten hours of the experiment. The consequences of this result on the experimental protocol used for the study of the interactions between natural sediments and deposit-feeders are discussed. In controls, the instability is produced by an initial decrease of radioactivity in the sediment, whereas in the presence of Abra alba, it corresponds to an initial increase of radioactivity. Analysis of previously published data suggests that such responses may result from the inhibition or the stimulation of the bacterial... |
| Tipo: Text |
Palavras-chave: DEPOSIT-FEEDER; MODELING; METHODOLOGY; NUTRITION; C-14. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00102/21278/18887.pdf |
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| Charles, F; Amouroux, Jm; Gremare, A. |
| We measured the utilization (i.e., ingestion and absorption) rates of the detritus derived from three microphytes (Nitzschia acicularis, Nitzschia sp., and Pavlova lutheri) by the deposit-feeding bivalve Abra ovata. The labelling procedure consisted in labelling Live microphytes with C-14 sodium bicarbonate. The cultures were then rinsed, frozen, and freeze-dried. The analysis of temporal changes in the distribution of radioactivity within the control chambers showed: (I) a significant production of (CO2)-C-14 and (2) a rapid transfer of radioactivity from POM (i.e., detritus) to DOM. Modelling of the exchanges of radioactivity between compartments within the control chambers permitted quantification of these two processes, and computation of the initial... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00099/21033/18659.pdf |
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| Gremare, A; Medernach, L; Debovee, F; Amouroux, Jm; Charles, F; Dinet, A; Vetion, G; Albert, P; Colomines, Jc. |
| The abilities of several biochemical characteristics of sedimentary organic matter to describe quantitative changes in benthic fauna were assessed based on several surveys carried out within the Gulf of Lion during the last decade. Two sets of high frequency samplings were carried out both inshore and offshore, together with an assessment of seasonal variability along a depth gradient, and a synoptic assessment of mesoscale spatial variability. The considered biochemical parameters were: total organic matter, organic carbon, nitrogen, total proteins, available proteins, carbohydrates, lipids, total and available amino acids. The considered faunal parameters were the abundance and the biomass of both meio- and macrofauna. Our results contribute to unravel... |
| Tipo: Text |
Palavras-chave: Matière organique sédimentée; Benthos; Golfe du Lion; Acides aminés; Biodisponibilité; Sedimentary organics; Benthos; Gulf of Lion; Amino acids; Bioavailability. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00321/43264/42995.pdf |
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| Riera, P; Richard, P; Gremare, A; Blanchard, G. |
| Nematodes living on an intertidal mudflat of the Marennes-Oleron Bay (France) were assayed for delta(13)C and delta(15)N ratios together with their potential food resources between July 1992 and May 1993. Results suggest that nematodes do not exploit all the components of the sedimented organic matter (SOM) pool at the same rate. Furthermore, based on coefficients of average trophic enrichment found in the literature for both C and N, the enrichment of nematodes in C-13 and their depletion in N-15 relative to SOM suggest that microphytobenthos constitutes their main food source in this particular environment. |
| Tipo: Text |
Palavras-chave: Nematodes; Microphytobenthos; Food sources; Stable isotope ratios. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00282/39288/43132.pdf |
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| Frantzis, A; Gremare, A; Vetion, G. |
| We measured growth rates and RNA/DNA ratios of deposit-feeding bivalves Abra ovata cultured for five months in the laboratory where they were fed on fresh detritus derived from twelve macrophytes (Rissoella verruculosa, Cystoseira mediterranea, Corallina elongata, Stypocaulon scoparium, Padina pavonica, Ulva rigida, Cystoseira compressa, Colpomenia sinuosa, Posidonia oceanica, Codium vermilara, Asparagopsis armata, and Dilophus spiralis). Growth rates and RNA/DNA ratios were significantly affected by the nature of the detritus offered. However, there was no significant (n = 65, r = 0,07) correlation between growth rates and RNA/DNA ratios. These results show that there were significant qualitative differences in the tested detritus. They suggest that the... |
| Tipo: Text |
Palavras-chave: DETRITUS; GROWTH; DEPOSIT-FEEDERS; BIVALVES; NUCLEIC ACIDS. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21136/18756.pdf |
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| Gremare, A; Amouroux, Jm; Cauwet, G; Charles, F; Courties, C; De Bovee, F; Dinet, A; Devenon, Jean-luc; Durrieu De Madron, X; Ferre, B; Fraunie, P; Joux, F; Lantoine, F; Lebaron, P; Naudin, Jj; Palanques, A; Pujo-pay, M; Zudaire, L. |
| A survey involving both permanent mooring and high frequency sampling was carried in the Bay of Banyuls-sur-Mer during the fall of 1999 to assess the effect of strong and unpredictable meteorological events on the functioning of a coastal Mediterranean ecosystem. A severe winter storm took place on 12 November, which generated waves with a significant height of 7 m and a sea surface rise of about 0.5 m. The near-bottom current speed at 24 m reached 30 cm s(-1). This storm induced a significant increase in total suspended matter through resuspension and then a subsequent increase in gross sedimentation rates. It also resulted in an increase of the proportion of refractory particulate organic matter in the water column. It also tended to increase nutrient... |
| Tipo: Text |
Palavras-chave: Impact à une tempête; Méditerranée nord-occidentale; Ecosystème côtier; Impact of storm; NW Mediterranean Sea; Coastal ecosystem. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00321/43265/42996.pdf |
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| Registros recuperados: 10 | |
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