Neutral carbohydrate geochemistry of particulate material (trap and core sediments) in an eutrophic lake (Aydat, France)

Carbohydrate compositions were determined on sinking particles and core samples from eutrophic lake Aydat. Carbohydrate fluxes indicate that phytoplanktonic production is the main organic matter (OM) source whereas the monosaccharides concentrations normalised to OC contents (TCH2O) mostly reflect d...

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Bibliographic Details
Published in:Organic geochemistry 2001-01, Vol.32 (1), p.151-162
Main Authors: Ogier, Sylvie, Disnar, Jean-Robert, Albéric, Patrick, Bourdier, Gilles
Format: Article
Language:English
Subjects:
Aydat lake
Carbohydrates
Earth Sciences
Earth, ocean, space
Environmental Sciences
Eutrophic lake
Exact sciences and technology
France, Aydat L
Geochemistry
Global Changes
Marine and continental quaternary
Monosaccharides
Sciences of the Universe
Sediment traps
Sinking particles
Soil and rock geochemistry
Surficial geology
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Summary:Carbohydrate compositions were determined on sinking particles and core samples from eutrophic lake Aydat. Carbohydrate fluxes indicate that phytoplanktonic production is the main organic matter (OM) source whereas the monosaccharides concentrations normalised to OC contents (TCH2O) mostly reflect degradation. The abundance of rhamnose in all samples, its increasing fluxes (together with fucose) with increasing water depth, and its strong decrease in the top 5 cm of the bottom sediments mark the intense activity of the microbiota. The almost complete removal of sugars in the water and top sediment indicates very little contribution to the preserved OM stock.
ISSN:0146-6380
1873-5290
DOI:10.1016/S0146-6380(00)00138-8