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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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| Giresse, P; Cahet, G. |
| The modern organic carbon flux of the Sanaga River and the rivers around the Bay of Douala is estimated to be 0.62-0.79 x 10(6) t yr(-1). In reality, mean Holocene sedimentation of organic carbon, including a presumed low biological production in the euphotic zone, is only 41-52 % of this-value. Substantial biodegradation in the salty and brackish turbid waters in the estuaries affects the POC and DOC arid corresponds to the highest bacterial densities. Between salinity 6 and 21, the data indicate a non-conservative behaviour of the suspended: and dissolved organic matter (POC and DOG). A breakdown of nearly 50 % of organic carbon is observed both in suspended matter of the open sea and in marine muds of near equal grain-size distribution. Incubation... |
| Tipo: Text |
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| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20467/18139.pdf |
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