Abstract
The sea water-suspended matter—sediment—interstitial water interface was studied for samples collected in the eastern North Atlantic. Fatty acid and hydrocarbon analyses were performed by gas liquid chromatography and mass spectometry in conjunction with microbiological and biochemical studies (French Programme ORGON). The geochemistry of the ocean-sediment interface was examined for selected cores, either sterile or characterized by high heterotrophic bacterial concentrations and organic matter assimilation capacities. Enrichments in odd carbon numbered and polyunsaturated fatty acid concentrations connected to specific sediment levels analyzed by microbiologists demonstrate that the interstitial water is a specific medium in which to observe obvious traces of microbial activities in sediments.
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