| Titre : | Biochemical composition of particulate organic matter and bacterial dynamics at the sediment-water interface in a Mediterranean seagrass system |
| Auteurs : | R. Danovaro, Auteur ; N. Della Croce, Auteur ; M. Fabiano, Auteur |
| Type de document : | Article |
| Dans : | Hydrobiologia (363 1998) |
| Article en page(s) : | 241-251 |
| Résumé : | The seagrass Posidonia oceanica is the most productive system of the Mediterranean Sea. In order to gather information on the temporal and spatial variability of the suspended particulate matter in relation to bacterial dynamics, water samples were collected at 10 cm above the sediments over a period of 13 months in the Prelo Bay (Ligurian Sea, NW Mediterranean). Measurements of seston concentration, as well as the elemental (POC and PON) and biochemical composition (lipids, proteins, carbohydrates and nucleic acids) of particulate matter were carried out to assess the origin, composition and bacterial contribution to the food potentially available in the seagrass system to consumers. Lipids and proteins were the main biochemical classes of organic compounds, followed by carbohydrates. Despite the highly refractory composition of the seagrass leaves, particulate organic matter was mostly composed of labile compounds (69.9% of POC). POM temporal patterns were controlled by current speed at the sediment-water interface that resuspended only small particles largely colonised by bacteria after an intensive process of fractionation and aging. In the seagrass system, the POM appears to be dominated by bacteria (density ranging from 0.7 to 2.5 x 10(9) cells 1(-1), representing more than 48.3% of POC and 68.7% of the biopolymeric carbon, as the sum of lipid, protein and carbohydrate carbon). This feature was characteristic of the seagrass system since much lower bacterial densities were found outside the Posidonia meadow. Bacteria were negatively correlated with the concentration of nitrite and nitrate suggesting a selective utilisation of inorganic nutrients to support their growth. |
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